GASTROPODA. 7 



which the hairs are arranged in spiral, hingitudinal series. Spire not raised above 

 the last whorl ; whorls 4^, very rapidly enlarging, separated by a deep, channelled 

 suture; first 2^, the protoconch, white, shelly, smooth, convex, not covered with 

 periostracum ; the last very large, inflated, slightly descending anteriorly ; aperture, 

 large, subcircular, lu'owu within ; peristome thin, continuous, the columellar margin 

 slightly reflexed. 



Greater diameter, 29 millim. ; lesser diam., 20' 5 ; height, 19 millim. ; aperture, 

 about 16 millim. in height and width. 



Operculum (fig. 7c) small, horny, reddish, lamellar, marked with fine lines of 

 growth, and having the nucleus lateral and marginal. Length, 7 millim. ; width, 5 • 5. 



Off Coulman Island, 100 fathoms, one adult specimen; off" Mount Erebus, 500 

 fathoms, one young example. 



The much-contracted animal is of an uniform light reddish colour in spirit. Edge 

 of mantle fringed, finely subpapillate, the papillae being grooved above. Head produced 

 into a long, non-retractile, pointed, annulated rostrum, which appears to be divided 

 above down the middle by a groove, which starts at the front part of the head between 

 the tentacles. The latter short, conical, pointed, laterally compressed, with the sessile 

 eyes at their outer base. Foot moderate, with a double margin in front, and with a 

 distinct groove above the side and hind margins. Penis moderate, behind the right 

 tentacle. 



Radula (fig. 7b), 2, 1, 1, 1, 2, of a brown colour; central tooth quadrate, acutely 

 unicuspid, laterals wider, subquadrate, with a single long, smooth cusp ; marginals 

 simple, hooked or curved. 



This, perhaps, is the most interesting Gastropod found l)y the Expedition. It 

 at once stands out as distinct from anything hitherto oljtained from the Antarctic 

 region. The shell, which is quite flexible and tough, like a chestnut skin, and the 

 beautiful hairy periostracum arc the two main characters of this very remarkable 

 species. 



The shelly protoconch, which is succeeded by the soft, flexible lower whorls, is 

 most unusual, and the reverse is much more common. For example, the protoconchs 

 in " The Tritons," Doliums, Purpuras, and other groups are more or less horny, the 

 adult shells being solid and calcareous. Generically, it is allied to Trldiotropis and 

 Velutlna, but the character of the radula is somewhat di0"erent, and there are diflerences 

 both in the shell and operculum which are sufficient to separate it. 



EULIMA CONVEXA. 



(PI, I., figs. 9, 9a.) 



Shell small, elongate, pellucid white, exhibiting the red dried remains of the 



animal, smooth, glossy, rather blunt at the apex ; whorls 8, a little convex, slowly 



and regularly increasing, narrowly marginate beneath the slightly oblique suture ; 



aperture ovate, acuminate above ; peristome whitish, the outer margin curved forward 



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