REPORT ON THE PTEROPODA. 41 



To the genus Notobranchsea, I refer Clio capensis, Rang, 1 from the Cape of Good 

 Hope, which was considered by Gray, 2 d'Orbigny, 3 and Boas, 4 as a Pneumonoderma. 

 The foot of " Clio capensis " shows the same disposition indeed as that of Notobranchsea 

 macdonaldi ; the neck and the head are also short, and finally, one can distinguish 5 

 the three crests of the posterior gill. But the figures given by Rang are not 

 accurate in regard to the foot and still less so in regard to the gill ; besides, the 

 buccal appendages are not at all known. It is therefore impossible to identify the two 

 forms. 



On the other hand, Macdonald 6 has noticed, as "trigonal tailed Clio," a little 

 Gymnosomatous Pteropod in which he has observed the same conformation of gill as in 

 Notobranchsea. But the foot is not described, and there should be two (?) pairs of 

 buccal cones, like those of Clione. 



Macdonald wrote me that he had obtained this Pteropod off Sydney Harbour. It 

 follows then that the genus Notobranchsea is distributed in both the northern and 

 southern hemispheres, in the Atlantic as well as in the Pacific Ocean. 



Family IV. Clionid^:. 



1840. Clionidx, Gray, Synopsis of the Contents of the British Museum, p. 86. 



1842. Pneumodermidx, d'Orbigny {pars), Paleontologie francaise, terrains cretac^s, t. ii. p. 4. 



1846. Glionoidx, Agassiz (pars), Nonienclator Zoologicus, Index, p. 90. 



1850. Clioneidx, Gray, Catalogue of the Mollusca in the Collection of the British Museum, 



pt. ii., Pteropoda, p. 35. 



1852. Clios, Souleyet (jiars), Histoire naturelle des Mollusques Pteropodes, p. 74. 



1855. Clioidea, Gegenhaur (pars), Untersuchungen liber Pteropoden und Heteropoden, 



p. 212. 



1856. Cliidx, Woodward {pars), A Manual of the Mollusca, p. 208. 



Characters. — Two or three pairs of conical buccal appendages. Jaw absent. Gill 

 absent. Skin not pigmented. 



Description. — Body long, contracted behind and pointed at its posterior extremity, 

 visceral mass not extending to that extremity, and in the adult occupying only the 

 anterior half of the body. Skin generally not pigmented ; no dorsal spot. Head round 

 and short ; long labial tentacles ; neck short. 



1 Description d'un nouveau genre de la classe des Pteropodes et de deux especes nouvelles du genre Clio, Ann. d. 

 Sci. Nat., ser. 1, t. v. p. 286, pi. vii. figs. 3, 4. 



2 Catalogue of the Mollusca in the Collection of the British Museum, pt. ii., Pteropoda, p. 40. 



3 Voyage dans l'Amerique meridionale, t. v. p. 129. 



4 Spolia atlantica, p. 167. 



6 Rang, loc. cit., pi. vii. figs. 3, 4. 



6 On the Zoological Characters of the living Clio caudata, Trans. Roy. Soc. Edin., vol. xxxiii. p. 186, pi. ix. fig. 3, 2. 

 (zool. chali. exp. — paut Lviu. — 1887.) Mmm 6 



