124 DR JAMES COSMO MELVILL AND ME ROBERT STANDEN ON THE 



tions, such as R. transenna* Wats., from Prince Edward Island, and R. aedonis^ of the 

 same author, from Nightingale Island. R. gelida, E. A. Sm.,J is, perhaps, the nearest 

 ally ; this is also an Antarctic species, and differs in the possession of an extra whorl, 

 and being longer proportionately to its breadth, also in a lesser degree of ventricosity 

 of whorl. Only two or three examples. 



Rissoa (Onoba) fuegoensis (Strebel). 



Rissoa (1 Cingula) fuegoensis, H. Strebel, Schwed. Sudpolar Exped., p. 56, Taf. vi. fig. 90 

 a, b (1908). 



Hob. Burdwood Bank, Station 346, 56 fathoms. 



A straw-coloured, closely spirally lirate Rissoa, which we should consider as 

 appertaining to the section Onoba in preference to Cingula. 



Rissoa (Onoba} paucilirata, sp. n. (Plate, fig. 10). 



E. testa ovata, anguste rimata, alba, epidermide tenuiter evanida straminea, interdum iridescente, 

 contecta, anfractibus ad 5, ventricosulis, apud suturas multum hnpressis, quorum duo apicales nitidi, albi, 

 Iseves, cseteris duobus fortiter spiraliter pauciliratis, liris penultimi duabus, ultinii anfractus septem vel 

 octo, praeditis, apertura ovato-rotunda, peristomate tenui, margine columellari fere recto. 



Alt. 2-25, diam. 1'25 mm. 



Hob. Burdwood Bank, Station 346, 56 fathoms. 



Conspicuous for its strong, spiral, carinated lirae, which are fewer in number than 

 those possessed by its allies ; these spiral ridges seem much the same in the Aleutian 

 species R. Aurimllii, Dall, or R. brachia, Watson, || from Culebra Island, West Indies. 

 This last, indeed, seems a very near ally, though quite distinct. 



Rissoa (Onoba) sulcata (Strebel). 

 Rissoa (Cingula} sulcata, H. Strebel, Schwed. Sudpolar Exped., p. 56, Taf. vi. fig. 86 a, b, c (1908). 



Hob. With the last species named, at 56 fathoms. Station 346. One specimen. 

 The spiral sulci are interesting. In form it resembles R. paucilirata, but the 

 essential characters are quite diverse. Colour inclined to reddish-fuscous. 



Rissoa (Ceratia) turqueti, E. Lamy. 



Rissoa (Geratia) turqueti, E. Lamy, Exped. Antarct. Franfaisa Charcot, p. 6, pi. i. fig. 8 (190(5). 

 Hob. With the preceding. One fine specimen in live condition, sub-pellucid, with 

 faint relics of thin stramineous epidermis. Station 346. 



* Rep. Challenger Exped., xv. p. 620, pi. xlvi. fig. 10. t Ibid., p. 600, pi. xlv. fig. 5. 



\ SMITH, Nat. Ant. Exped. : N.H., vol. ii. p. 9, pi. ii. fig. 5. Proc. U.S. Nat. Mus., p. 309, pi. iv. fig. 8 (1886). 



|| Rep. Cliallenger Exped., xv. p. 599, pi. xlv. fig. 8. 



(ROY. soc. KDIN. TRANS., VOL. XLVIII., 350.) 



