172 



WEST COAST SHELLS 



of the size of the cut have been dredged recently, 

 and somethnes the shell reaches a length of about 

 four inches. It has been obtained from fishermen 

 who work in the vicinity of San Pedro in consider- 

 able numbers, and a few specimens have« even been 

 found on the shore. 



Boreotrophon scitulus^ Dall, 

 the Elegant Trophon, Figure 161, 

 is a type of a large number of spe- 

 cies which live mostly in northern 

 waters, and which have been as- 

 signed to this genus. It is a little 

 shell, two-thirds of an inch in 

 length, but it is supplied with an 

 abundance of frills, as is shown 

 in the picture. It was first found 

 in Bering Sea, but like many 

 others of the cold water shells it 

 probably exists in deep water as 

 far south as the Santa Barbara 

 Islands. 

 Boreotroplion stuarti, E. A. Smith, Stuart's Tro- 

 phon {T'rophon orpheus). This fine shell has from 

 seven to twelve varices, with the interspaces crossed 

 by four or five rounded spiral coils. It sometimes 

 reaches a length of two inches. The sharp, white 

 varices make a crown at the suture. It ranges from 

 Alaska to Santa Cruz, seeking deeper water as it 

 comes southward, doubtless because the deep water 

 is colder and more like its Arctic home. 



Boreotrophon gracilis^ Perry {^roption multi- 

 CO status)^ the Graceful Trophon. This northern 



Fig. 161. X \ (*) 



