Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 CEPHALOPODA. 57 to the Pteropods. The morphological relation between these two groups was first thoroughly discussed by R. Leuckart. lie showed that the cephalic cones (tentacles) of Clio correspond to the cephalic arms of Cephalopods, while the median lobe of the foot, represented by the cervical collar, is the equivalent of the funnel. Huxley, however, does not take this view; he holds that the arms are parts of the propodium and that the funnel, which is formed by the fusion of paired
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 CEPHALOPODA. 57 to the Pteropods. The morphological relation between these two groups was first thoroughly discussed by R. Leuckart. lie showed that the cephalic cones (tentacles) of Clio correspond to the cephalic arms of Cephalopods, while the median lobe of the foot, represented by the cervical collar, is the equivalent of the funnel. Huxley, however, does not take this view; he holds that the arms are parts of the propodium and that the funnel, which is formed by the fusion of paired folds, is equivalent to the paired ele- ments of the epipodium which in Ptero- pods form the fins. The mantle cavity is placed on the posterior surface of the body, which in the natural po- sition is the under surface. In it are placed on each side one (Dibranchi- ata) or two (Tetrabranchi- ata) gills, the anus, the paired renal openings, FIG. 530.—Octopus macropus, creeping (after Verany). T, funnel. and the genera- tive opening which is sometimes single and sometimes paired. The eyes and olfactory organs are placed at the sides of the head. Anteriorly around the mouth four pairs of fleshy cephalic arms, chromolithographies d'apres le vivant.' Ie Partie. Cephalopodes de la Medi- terranee. Genes, 1847-51. H. Miiller, ' Ueber das Mannchen von Argonauta argo und die Hecto- cotylen.' n-iss. Zool., 1855. Jap. Steenstrup, ' Hectocotylus dannelsen hos Octopodsl., etc.' K. Dankx. V'ulcnsk. ScWtabs Skrifter, 1856. Uebersetzt im Archivfiir Naturgesoh., 1856. Alb. Kolliker, ' Eiitwickelungsgesch. der Cephalopoden.' Zurich, 1844.
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