150 Miscellaneous. it the amoeboid body of the Rhizopods moves slowly. There are sometimes more than twenty of these Rhizopods upon the same Cancerilla. In its general character Oancerilla iitftitZaia approaches Ascomyzon echinicola, Norm., a parasite of Echinus esculentus, and Asterocheres Lilljehorgii, Boeck, a parasite of Echinaster sanguinolentus. The structure of its buccal armature is intermediate between that of the Poecilostoma and Siphonostoma, and seems to show the artificiality of those two groups. The families Lichomolgidae, Kossm. (Sapphi-rinidae, Btrtdi/), Ascomyzontidae, Boecl~ (Artotrogidae, Brady), Bomo-lochidae, Glaus, and Ergasilidee, Clans, should be united into a single group, for which the name Corycseidse may be retained, as already proposed by Delia Valle for the Lichomolgidte. That author, how-ever, goes too far when he unites under the genus Licliomolgus forms of Copepoda parasitic upon Coelenterata, Gymnotoca, and Tunicata, for which, as for the types parasitic upon Echinodermata, distinct genera should be retained. — Comptes Rendus, April 25, 1877. On some Points in (lie Anatomy of tlie BJiynchobdellean Hirudinea. By M. Georges Duiilleul. 1. Dorsal organ of tlie Glossiphonise. — In a recent memoir M. Nusbaum, of Warsaw, indicates the presence, in the embryo of Glossiphonia complanata, Linn. {O. sexocidata, Bergmann), of a provisional dorsal organ which had escaped the notice of his prede-cessors. This is a pyriform cavity, limited externally by the raised ectodermic lamina and internally by the somatic mesoderm. The ectodermic cells bear long appendages which serve for the reciprocal attachment of the young animals. This organ soon disappears, ac-cording to the author, without leaving any traces. M. Nusbaum adds no comment to his description. Having, in the course of my investigations, had the opportunity of checking the author's description and ascertaining its perfect correctness, the question arose, whether nothing of the same kind exists in the embryos of other species of the genus GlosHphonia, and particularly in that of G. bioculaia, Bergm., which, in the adult state, bears a characteristic dorsal organ. My investigations of this species enabled me to ascertain that its embryo presents, in the very place of the dorsal organ of the adult, a formation analogous to that described by M. Nusbaum in the embryo of G. sexocidata. The embryos of G. marginata, Miill., are also provided with this organ, which, in them as in G. sexoculata, is provisional. From these observations we may conclude that the provisional dorsal organ of Nusbaum in the species sexocidata and marginata represents the permanent dorsal organ of the species bioculata. As regards the ultimate fate of this provisional organ I have several times been able to find traces of it in the adult animals.
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