1883.] THE 'TRITON ' EXPEDITION. 395 



4. Trophon caeinatusS Jeffreys. (Plate XLIV. fig. 4.) 



Shell distinguishable from T. clathratus in having a prominent 

 keel in the middle of each whorl ; the laminar ribs are fewer and ob- 

 tusely angulated ; the spiral striae, which cover the interstices of the 

 ribs, are numerous, regular, comparatively strong, and flexuous or 

 curved : colour white : inner lip glazed and lustrous. L. (if perfect) 

 0-6, B. 0-25. 



An imperfect but characteristic specimen from Station 13, 570 

 fathoms. 



5. Fusus SABiNi, (sabinii) Gray. (Plate. XLIV. fig. 5.) 



Buccinum sabinii, Gray in Suppl. to App. of Parry's First Voyage, 

 p. 0x1 (1824). 



Shell forming a somewhat short spindle, rather thin, semi- 

 transparent and rather glossy : sculpture, numerous fine and thread- 

 like spiral striae, of which there are from 20 to 30 on the last, and 

 8 to 1 2 on the penultimate whorl ; these are crossed by microscopic 

 and far more numerous striae in the line of growth : colour uuder 

 the epidermis chalky-white : epidermis pale yellowish-brown, filmy, 

 and easily removed ; it is fibrous towards the mouth : spire taper- 

 ing to a blunt point ; apex irregular, sometimes flattened at the top, 

 but occasionally twisted : whorls 6-7, moderately convex ; the last 

 occupies rather more than two thirds of the shell when placed with 

 the mouth upwards : suture rather deep : mouth pear-shaped, acut- 

 angular above ; length (including the canal) exceeding the rest of 

 the spire ; inside slightly notched by the impression of the spiral 

 striae : canal shortish, turning somewhat abruptly to the left, equally 

 wide and open throughout, and ending in a large and obliquely 

 curved notch : outer lip flexuous and sharp-edged : inner lip polished 

 by the continual attrition of the foot : pillar flexuous, obtusangu- 

 lar at its junction with the canal : operculum triangularly oval, strong, 

 yellowish-brown or light horn-colour, marked with close-set lines of 

 growth; nucleus terminal on the inner side, and falciform. L. r75, 

 B. 0-75. 



Many living specimens from Stations 8 and 9, in 608 and 640 

 fathoms. 



Having carefully compared these and other specimens with the 

 types of Reeve's Fusus tortuosus in my possession from the collection 

 of the late Admiral Sir Edward Belcher, I must adhere to my 

 opinion expressed in the 'Annals of Natural History' for April 1877, 

 that both belong to one and the same species. Sipho tortuosus of G. 

 O. Sars is a different species, and is the Tritonium turritum of M. 

 Sars ; my Fusus attenuatus is not a variety of that species. Besides 

 the numerous localities there given, I am enabled, through the kind- 

 ness of my friend Herr Friele, to add the Norwegian Arctic Expe- 

 dition, Station 324, 1 23 fathoms, as well as the cruise of the ' Knight 

 Errant,' in 540 fathoms. Gray contrasted his species with F. graci- 

 lis (his Buccinum corneum), and said it was " not so long and slender, 



1 Keeled. 



