Hassall and Stiles (1892) described this delicate parasite and gave it the name Strongylus rubidus. Our knowledge of it has recently been increased by Hall (1921) who has shown that it is not a member of the genus Strongylus, as represented by S. equinus of the horse, but is a member of the family Trichostrongylidæ. He has created a new genus Hyostrongylus for its reception and has devoted a large part of his paper to the consideration of a male accessory organ which serves as a guide for the spicules and to which he gives the name telamon.

During a recent visit to Copenhagen, through the courtesy of Dr. Bahr and of the Chief Veterinary Superintendent, I visited the Central Meat Market. Veterinary inspection of all living animals sent to the market is exercised, as well as of all carcases. If a carcase appears the least abnormal, without definite macroscopic changes, it is examined bacteriologically in an attached laboratory, equipped and staffed for the purpose, and all carcases of pigs, as well as any imported swine products, e.g., American hams, are subjected to examination for trichinosis. For this purpose, three small pieces of tissue are taken from every carcase or ham. From each piece of tissue six specimens are prepared for microscopical examination, so that eighteen microscopical specimens in all of every carcase, or other swine product, are subjected to examination. For the examination a “compressorium” is made use of, consisting of two rectangular pieces of plate glass, measuring about 6 in. × 2½ in., which are clamped together by a threaded bolt with nut at either end. One plate is divided into eighteen numbered squares, six squares longitudinally by three squares transversely. Particles of tissue about the size of a rice grain or so, with a drop of saline solution, are each placed in a square, so that the precise derivation of the material in each square may be recorded by its number. When all the squares have been filled, the corresponding plate is applied and screwed up, so as to squeeze out the tissue into a layer thin enough for microscopical examination with a low power, and in area about the size of a shilling. So far, there is nothing novel in the method, which has been practised for years, e.g., at Hamburg. But at Copenhagen, instead of direct microscopical examination of the specimen, an image of it is projected on to a screen, and is viewed thereon with the naked eye. One assistant can examine 100 specimens a day.

The area covered by this Survey does not admit of exact delimitation, but it might roughly be stated as that region of North Cardiganshire extending for a radius of about fifteen miles from Aberystwyth. Cardigan Bay and the Dovey Estuary form natural boundaries on the West and North respectively, while the Plynlimon range of mountains runs along the eastern side and forms an elevated plateau about 1,500 ft. above sea level. The area is therefore somewhat self-contained, comprising the more or less gradual slope from this plateau westwards to the sea.

In “Veterinary Medicine” for March, 1924, Dr. M. C. Hall contributes the third instalment of his paper, “Developments in Veterinary Parasitology during the past Fifteen Years,” and on pages 190 and 191, under the heading Lungworms (Metastrongylidæ), considers work on the life histories of the lung-worms of sheep and cattle, Dictyocaulus filaria and D. viviparus, and then refers to the paper under review. His words are as follows: “The life-histories of the swine lung-worms Metastrongylus elongatus and M. brevivaginatus have been ascertained by an American worker, Zebrowski. In general it is similar to that of Dictyocaulus filaria above, but the moisture requirements of the larvæ in cultures are rather exact. Zebrowski's work, published in 1921 in the proceedings of the Indiana Academy of Science, has been quite generally overlooked.”

While examining some sections of a specimen of Inermicapsifer hyracis (Rud.), we came across an extremely interesting and, what we believe to be, a unique occurrence.