. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. G84 CIRRHOPODA. meister aussi les place parmi les Crus- tacea. De Blainville les arrange, sous le nom d'Nematopoda, comme une classe de son sous-type de mollusques - Mollusk-articulata ; l'autre classe du sous-type en cours de formation de l'Chitons (Polyplakiphora). Il les considère comme Crustaceous Mollusca, mais admet qu'ils semblent former un groupe de transition réunissant les crustacés avec les annélides. M. Saint Ange*, cependant, serait plutôt leur classe avec les annélides, compte tenu de la plus près que l'arrangement

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. G84 CIRRHOPODA. meister also places them amongst the Crus- tacea. De Blainville arranges them, under the name of Nematopoda, as a class of his subtype of the Mollusca — Mollusc-articulata ; the other class of the subtype being formed of the Chitons (Polyplakiphora). He regards them as Crustaceous Mollusca, but admits that they seem to form a transition group uniting the Crustacea with the Annelida. M. St. Ange, * however, would rather class them with the Annelida, on account of the closer resemblance which the arrangement of their nervous system bears to that of these animals. Professor Wagner does not doubt that they are really articulated animals, but he would rather place them in a distinct class between the Mollusca and Articulata. Setting aside their nervous system, M. Serres sees, in the other parts of their structure, points enough to in- duce him to arrange them with the Mollusca. The same views are entertained by Wiegmann, Goldfuss, and others. Dr. Leach regarded them as truly annulose animals. Dr. Grant (who calls them " entomoid animals enclosed in shells") places them amongst the Articulata, or diploneurose animals, between Rotifera and Annelida, making of them a distinct class, but admitting their great resemblance in many points to the entomostracous Crustacea. Mr. J.V.Thompson (whose admirable researches on the development of the Cirripeds have thrown a new interest around them) holds it as proved by his observations that the Cirripeds do not constitute a distinct class; but that they are naturally and closely connected, on the one hand, with the Decapod Crustacea, through the Balanids, and, on the other, with the Entomostraca, through the Lepads; further, that they have no relation with the Testacea. All the known Cirripeds may be naturally grouped into two families, one pedunculated, the other sessile. The former includes all the barnacles, properly so called ; the

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