64 TRACHVDIiKMoN. 



of which he is himself undecided on. Another "genus, 

 he proposes for the Cape Horn specie- //"///''-e; this group also has 

 sli-jht peouHaritiefl of dentition, and if such minute subdivision is 

 <1< -i ruble, it might be retained as a section. 



T. ALBUS Linne\ (Vol. XIV, p. 70). 



Var. hifnscatus Schneider. 



Sculpture, girdle and radulaas in the type, but color yellow-brown 

 or brown-black. 



West coast of Prince Charles' Promontory ; Spitzbergen, Quaenmi- 

 genfjord, Norway. 



See SCHNEIDER, Tromso Museums Aarshefter, vol. 4, 1881, p. 

 57, and KRAUSE Zool. Jahrb., 1892, p. 348. 



T. FLECTENS Cpr. PL 15, figs. 34, 35, 36, 37. 



For original description see Vol. XIV, p. 75. 



Shell small, ovate-oblong, moderately elevated. Roseate or deep 

 IJin.il rt-tl, more or less maculated with blue, especially along the 

 natural margin; the blue sometimes predominating on some valves. 



Median valves squared and slightly beaked ; minutely granulated 

 all over, more closely on the lateral areas, which are otherwise scarcely 

 '/' fined (fig. 36). Mucro somewhat anterior, rather projecting (fig. 

 34). 



Interior of a beautiful deep rose color. Anterior valve having 8, 

 median valves- 1-1, posterior valve 7 slits. Eaves narrow, short 

 ami solid. Sinus slightly laminate. 



Girdle rather densely covered with minute, elongated but scarcely 



imbricating scales (fig. 37), and fringed with hyaline spinelets. Gills 



:iliiiL r forward two-thirds or three-fourths the length of the foot. 



Length 12, breadth 7 mill. ; divergence 110 



piit/i't S,,n,,d (Cpr.); off \'ictori<i, British Columbia (Newcombe, 

 1892) ; S. Pedro (Cooper). 



This is a beautiful little species, the examples before me from 

 Victoria, B. C., being especially remarkable for their deep colors. 

 The sculpture and the spotting of the sutural margins reminds one 

 of T. dentiena, which is evidently its nearest of kin. 



