REPORT ON THE PTEROPODA. 45 



(9) Clione elegantissima, Dall = Clione limacina, Phipps. 



(10) Clio miquelonensis, Eang= Clione limacina, Phipps. 



(11) Clione papilionacea, auctorum = Clione limacina, Phipps. 



(12) Clio retusa, 0. F. Miiller (non L.) = Clione limacina, Phipps. 



4. Names applied to species not well enough known and described to be distinguished 

 from one another — 



(13) Clio australis, Bruguiere. 



(14) Cliodita fusiformis, Eang. 



(15) Clio limacella, Eang (without description). 



(16) Clio pyramidata, Eang. 



I shall speak afterwards of these last four species. 



There are, then, only three forms well enough known and characterised to be 

 distinguished from one another, as in the following table : — 



I. With three pairs of buccal cones, ....... Clione limacina. 



II. With two pairs of buccal cones. 



1. Animal small, of a brownish colour, with the posterior lobe of the foot very short, Clione longicaudata. 



2. Animal of moderate size, of a yellowish colour, with the posterior lobe of the foot 



rather long, ........ Clione flavescens. 



Of these three species only one is very abundant in the Arctic Seas, and the two 

 others are very localised, and thus the Challenger, which did not go to the Arctic Seas, 

 did not bring back specimens of the genus Clione. It is the only genus of Gymnosomata 

 that was not collected during the cruise. 



■e 



1. Clione limacina (Phipps). 



1773. Clio limacina, Phipps, A Voyage towards the North Pole, p. 195. 



1774. Clione borealis, Pallas, Spicilegia zoologica, fasc. x. p. 28, pi. i. figs. 18, 19. 

 1776. Clio retusa, 0. P. Miiller, Faunae danicee prodromus, p. 226. 



1825. Clio miquelonensis, Rang, Description d'un nouveau genre de la classe des Pt<5ropodes et 



de deux nouvelles especes du genre Clio, Ann. d. Sci. Nat., st5r. 1, 

 t. v. p. 285, pi. vii. fig. 2. 

 1871. Clione elegantissima, Dall, Description of Sixty New Forms of Molluscs from the West 



Coast of North America, Amer. Journ. of Conchology, t. vi. p. 139. 

 1885. Clione dalli, Krause, Ein Beitrag zur Kenntniss der Mollusken Fauna des Berings 

 Meeres, Archiv f. Naturgesch., Jahrg. li. p. 299, pi. xviii. fig. 19a. 

 Clione papilionacea, auctorum. 



Body long, tapering to a point behind. Head round and swollen ; neck short. Skin 

 not pigmented over all its surface, but of a bright red colour at the posterior extremity 

 and on the head and buccal cones l of the living animal (the alcoholic specimens are of an 

 orange colour). 



Foot. — Large anterior lobes, broad in front, pointed behind, attached in nearly their 



1 See the figure of Eschriclit, Anatomische Untersuchungen iiber die Clione borealis, pi. i. figs. 1-4. 



