TR1CHOTROPIS. 43 



affecting the contour and general appearance. I include here : 

 T. Atlantic a, Beck ; T. acuminata, Jeffreys ; T. coxtellata, Couth, 

 (fig. 48); T. inermis, Hinds (fig. 52); FUMUX Laxkeyi, Macgill.; 

 Fusus umbilicatus. Brown ; T. conica, Moll. (fig. 45); T. quadri- 

 carinata, A. Ad. (fig. 44), from Japan; T. irixifjnis, Midd., var. 

 of Aurivillius (fig. 59). 



T. CLATHRATA, A. Ad. PL 7, fig. 51. 



Umbilicus narrow, whorls angular, carinated above, cancel- 

 lated with slightly beaded spiral ribs and interstitial regular, 

 small, longitudinal riblets ; epidermis thin, yellowish brown. 



New Zealand. 



T. inornata, Hutton, is a synonym. I have not seen this 

 species, which so greatly resembles T. borealis, but is from an 

 entirely different locality. The figure shows no trace of hairs 

 on the epidermis. 



T. CANCELLATA, Hinds. PL 7, figs. 49, 50. 



Umbilicus small, whorls about 7, well rounded, with elevated 

 spire, with a number of spiral ribs, obsoletely cancellated here 

 and there by distant longitudinal and less prominent ribs ; epi- 

 dermis light brownish or grayish ; aperture often pink. 



Length, 1-1/4 inches. 



Alaska to Vancouver's Island. 



Appears to be peculiar to the west coast of Xorth America, 

 where it replaces T. borealis. Jeffreys considers it identical 

 with that species, and as Arctic mollusca are exceedingly varia- 

 ble, this may be so; yet I find no conclusive evidence of it. T. 

 flavida, Hinds (fig. 50), belongs here, 



T. CORONATA, Gould. PL 7, figs. 53, 54. 



Umbilicus rather wide and deep, acutely margined ; whorls 

 about 6, tabulate and carinate at the angle ; epidermis ash- 

 colored, fibrousl}' produced at the angle. Length, 25 mill. 



tits, of Semiavine, Arctic Ocean; Behring's Sea. 



The first figure given above is supposed by Krause, who 

 publishes it, to represent the species, but it does not appear to 

 me to agree with the description. Gould never figured it. I 

 have added a figure given by Aurivillius, which is probably a 

 better representation of it, and approaches T. unicarinata. 



