64 TRACK YDERMON. 



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

 he proposes for the Cape Horn species punicea ; this group also has 

 slight peculiarities of dentition, and if such minute subdivision is 

 desirable, it might be retained as a section. 



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



Var. infuscatus Schneider. 



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

 or brown-black. 



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

 genfjord, Norway. 



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

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



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



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



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

 blood red, more or less maculated with blue, especially along the 

 sutural 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 

 defined (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 

 and solid. v Sinus slightly laminate. 



Girdle rather densely covered with minute, elongated but scarcely 

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

 extending forward two-thirds or three-fourths the length of the foot. 



Length 12, breadth 7 mill.; divergence 110 



Puget Sound (Cpr.) ; off Victoria, 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. dentiens, which is evidently its nearest of kin. 



