44 TRICHOTROPIS. 



T. UNICARINATA, Brod. and Brod. PI. 7, fig. 56. 



Whorls tabulately shouldered, with a single beaded keel at 

 the angle ; umbilicus wide, surrounded by a keel, rest of surface 

 smooth ; pinkish, covered by a brown epidermis. 



Length, 20 mill. 



Japan. 

 T. CEDO-NULLT, A. Ad. PL 7, fig, 55. 



Spire elevated, whorls rounded, umbilicus minute or imper- 

 forate, cancellated by spiral beaded ribs and longitudinal riblets, 

 columella truncate and a little turned back at the base, epidermis 

 reddish brown. Length, 1.2 mill. 



Japan. 

 T. FIMBRIATA, Jeffreys. PL 7, fig. 57. 



Thin, semitransparent, imperforate ; whorls 4-5, with spiral 

 ciliated riblets, of which there are 8-10 on the body-whorl; 

 columella straight. Length, 2-5 mill. 



Atlantic (Porcupine Exped.). 



Evidently a very young shell. 



T. DENSISTRIATA, Jeffreys. PL 7, fig. 58. 



Thin, semitransparent, imperforate ; whorls 3-4, rather tumid, 

 with numerous spiral striae, which are covered by minute, close- 

 set prickles, body-whorl with a shallow peripheral sulcus ; 

 columella straight, truncate below. Length, 2 mill. 



Cape Verd I.; 1192 fms. 



This, like the last, is a very young shell. 



T. KROYERT, Phil. PL 8, figs. 61, 60, 62-64. 



Shell thick, widely unlbilicated ; whorls 5, with distant spiral 

 ribs ; umbilicus encircled by a rib ; epidermis yellowish brown. 

 Length, 1/5 inches. 



Spitzbergen, Beliring's Strait. 



The synonyms are T. Kuzeri, Phil., and T. Ruzeri, Phil., of 

 Reeve and Brazier respectively, both misprints ; T. ciliata, 

 Kroyer; T. dolium, Petit; T. arctiea, Midd. (figs. 62, 63). 

 Aurivillius has figured an immense specimen of this species 

 (fig. 60), and another, 'with a tubercle near the base of the 

 columella (fig. 64), which he has distinguished as T. solida. 



