192 THE PTEROPODA 



The specimens are small, and reach a length of 6 — 7 mm. 

 A very faint longitudinal rib runs dorsally, another, much 

 broader, at the anterior ventral part of the shell, which 

 is itself slightly depressed (fig. 10); the lateral ribs, rather 

 conspicuous at the aperture, which is itself rounded, gra- 

 dually disappear distally. The whole surface of the shell 

 is provided with small ridges, thus giving it a great resem- 

 blance with that of Hyolocylix striata (Rang), from which 

 it is otherwise distinguished by mauy characters. The whole 

 shell is straight, not at all curved ; the embryonic part is 

 distinctly separated (fig. 9) and terminating into a point. 



Pelseneer (1888, p. 62, PI. II, fig. 8) holds, that the 

 embryonic shell of this species is rounded, and for that 

 reason very different from that of Clio sulcata (Pfeffer). 

 1 agree, however, with Boas (PL 4, fig. 46), who gave an 

 accurate figure of the embryonic shell of C. australis. The 

 little cup, in which it ends, may very easily be broken off, 

 as indeed occurs in one of the two specimens in the col- 

 lection of the Museum. In this respect, regarding the 

 embryonic shell, C. australis and C. sulcata seem to agree 

 entirely, though I am of opinion, like Pelseneer, that C. 

 sulcata is quite a distinct species, contrary to Boas (p. 68). 



Species 3. Clio pyramidata (Linné). 

 Animals : 



Atlantic Ocean, date?, 2 sp., ? 



N. Atlantic Ocean, (46^ N., 11^ E.), 1878, ±20 sp., R. J. Liisink. 



// (26^ N., 20^ E.), 1879, 4 sp., // 



// (35' N., 2PE.), 1879, 2 sp., // 



// (Bay of Biscay), 1904, 1 sp., Buitendijk. 



// (5' N., 24' K), 1879, 1 sp., R. J. Lusink. 



II (4'N., 24' E.), 1878, 3 sp , // 



S. Atlantic Ocean, (14' S., 7' E.), 1878, 1 sp., // 



Mediterranean, date?, ±35 sp., Cantraine. 



// (Messina), d^te?, 9 sp., // 



Indian Ocean, (32' S., 31'E), 1878, 1 sp., R. J. Lusink. 



// (32' S., 34' E.), 1880, 1 sp., // 



// September '06, 1 sp., Buitendijk. 



Notes from the Leydeii jMuseum, Vol. XX.IX. 



