In the course of investigations on the Gregarines of Cirratulus (Audouinia) tentaculatus Mont., I have frequently noticed a large astomatous ciliate in the intestine. This appears to be Anoplophrya brasili described by Léger and Duboscq in 1904. One or two points, however, have led me to make a closer study of this organism, and I have come to the conclusion that it should be removed from the genus Anoplophrya.

Le nombre des travaux traitant de la concentration moléculaire des sues et tissus des divers animaux est déjà très grand (Fredericq, Sabbattani, Bottazzi, Quinton), pourtant les parasites ont été négligés. C'est pour combler cette lacune, que nous avons entrepris les recherches dont nous donnons ici les premiers résultats. La détermination des concentrations moléculaires a d'abord un intérêt en elle-même, comme détermination de constante physico-chimique. Elle peut, d'autre part, donner d'utiles renseignements pour l'étude des milieux de culture des grands parasites; elle peut aussi indirectement contribuer à l'étude de la spécincité parasitaire ainsi qu'à celle de la nutrition des parasites intestinaux.

The worm described in the present paper was obtained from the stomach of the common cat-fish, Clarias batrachus Bl. from Nagpur, C.P., India. Only 5 out of the 22 individuals examined harboured this parasite and as many as eight were obtained from a single individual. With the exception of two specimens, they were preserved in glycerol and were not subsequently used. The remaining two specimens were flattened out between glass slides and fixed in Mann's fluid.