of British Mollusca. 131 



If is recorded fiorn Greenland, Spetsbergen, Icelau 1, and 

 Norway. 



4. Beta Trevelyana (Turton). 



This species has been well figured both by Sars and Friele. 



5. Bela tenuicostata (M. Sars). 



Pleurotoma tenuicostata, M. Sars, Overs. Vid.-Selsk. Forh. 1868, p. 259. 

 Bela tenuicostata, G. 0. Sars, /. c. p. 237, pi. xvii. fig. 1 ; Friele, /. c. 

 p. 14, pi. viii. figs. 16, 17, pi. x. fig. 14. 



' Porcupine,' 1869, Stat. 23, lat. 56° T N., long. 11° 19' W., 

 d30 fath., to the south of Rockall. 



Tins species is common in the Norwegian fiords. It was 

 taken by the Norwegian N. -Atlantic Expedition at seventeen 

 stations in deptlis 100-1215 fathoms ; was dredged by the 

 ' Valorous ' in the Atlantic in 1450 fathoms, by the ' Porcu- 

 pine,' 1870, in the Bay of Biscay, and by Verrill off the 

 coast of New England in 1290 fathoms. 



6. Bela ovalisy Friele. 



Pleurotoma {Bela) oralis, Friele, Nyt Mag. xxiii. (1877) p. 9, fig. 5. 

 Plevroto7na exiyiia, Jefti'eys, Report ' Triton' Exped., Proc. Zool. See. 



1883, p. 399, pi. xliv. fig. 10. 

 Bela pyijmcea, Verrill, Trans. Connect. Acad. toI. v. pt. 2 (1882), 



p. 460, pi. Ivii. fig. 8. 

 Bela ovalis, Friele, I. c. p. 14, pi. viii. figs. 21, 22, pi. x. fig. 19. 



This little species, it will be seen, has been discovered by 

 three expeditions in widely different areas soon after each 

 other. The British locality is on the Holtenia ground north- 

 west of the Butt of Lewis; 'Triton' Exped., 1882, St. 13, 

 lat. 59° 51' N., long. 8° 18' W., in 570 fathoms. 



It was dredged by the Norwegian Exped. at eight stations 

 in 658-1333 fathoms, and by Verrill off N.E. America in 

 312-1290 fathoms. 



7. Bela hicarinata (Couthouy). 



Pleurotoma bicarinata, Couthouy, Boston Journ. Nat. Hist. ii. 1839, 



p. 105, pi. i. fig. 11. 

 Pleurotoma violacea, Mighels, Proc. Boston Soc. Nat. Hist. toI. i. 1841, 



p. 50. 

 Defrancia cylindracea, livida, and Beckii, Moller, I. c. pp. 86, 87. 

 Bela bicarinata, G. O. Sarr-, /. c. p. 237, pi. xvi. figs. 11, 12. 

 Bela violacea, id. ib. p. 238, pi. xvii. fig. 2. 



Bela bicarinata, Friele, I. c. p. 15, pi. viii. figs. 18, 19, pi. x. figs. 15, 16. 

 Pleurotoma bicaritiata, Jefii'eys, Ann. & Mag. Nat. Hist. ser. 4, vol. xix. 



(1877) p. 325. 



' Porcupine,' 1869, to the south of Rockall, St. 23 a, lat. 



9* 



