186 THE PTEROPODA 



Shell thin, quite transparent, colourless, left-handed ; 

 umbilicus very narrow; spire high, with obtuse summit; 

 whorls 57.21 the last turn very large, occupying about ^3 

 of the shell; lips of the aperture very thin and fragile, 

 aperture rounded, not angled ; outer lip regularly curved, 

 inner lip straight, projecting with a very thin margin over 

 the umbilicus, and terminating in a short, pointed rostrum. 

 Sculpture quite absent, only a few striae radiating from 

 the umbilicus. 



Height of the shell I'/s mm.; maximum diameter 1 mm. 



Operculum and animal unknown. 



The specimens were obtained under the name » Spinalis 

 australis'^ Souleyet. That they do not belong to this spe- 

 cies is proved: 1° by the shallower suture, 2° by the dif- 

 ferent proportion in bulk of the last whorl to the foregoing 

 in favour of the first, 3° the smaller aperture, nearly not 

 projecting beyond the last whorl, 4° the pointed rostrum, 

 5° the narrow umbilicus, 6° the much more blunted apex, 

 and 7° the smaller size, L. australis reaching a height of 

 2—2,5 mm. 



The new species differs from L. trochiformis in the 

 higher spire; moreover (and also from L. hulimoides) in the 

 obtuse apex of the shell. It resembles, however, L. retroversa 

 more closely than any other (cf. figs. 5 and 6). In this 

 last species, on the other hand, the aperture is somewhat 

 angled, owing to the irregular curving of the outer lip, 

 while in L, cochlostyloides this curving is regular; the 

 suture is much deeper in L. retroversa, and the very fine 

 but clearly recognizable striation in spiral direction of this 

 species is altogether wanting in L. cochlostyloides. 



The new species belongs, in my opinion, to the group 

 anstralis-retroversa, and shows much affinities with the latter. 

 The habitat is in this respect most peculiar, as L. australis 

 is typically antarctic, L. retroversa notal and boreal, viz. 

 occurring in the temperate regions of both hemispheres (see 

 especially Meisenheimer, p. 910), meanwhile the new spe- 

 cies is recorded from tropical regions, the gulf of Bengal. 



r<Jotes from tUe Leyden IMuseum, Vol. XXIX. 



