MU RIGID AE 



207 



described, and we have figured the subspecies scalariformis Gould, commonly 

 dredged in the Grand Banks. 



Handsome Trophon 



Figure /\6d 



Boreotrophon scitulus Dall 



Alaska to San Diego, California. 



I to 1% inches in length, rather fragile, pure-white in color, with a 

 rather long siphonal canal. Characterized by 5 or 6 spiral rows of long, deli- 

 cate, anteriorly hollowed spines. In the spire only two rows show. Oper- 

 culum thin, light-brown, chitinous, ungulate. Rare, 50 to 250 fathoms. 



r,(.,\\M'vi# 



Figure 46. Pacific Coast Trophons. a, Boreotrophon dalli Kobelt; b, B. triangiila- 



tus Cpr.; c, B. iniilticostatiis Esch.; d, B. scitulus Dall; e, B. orpheiis Gould; f, 



B. pacificus Dall. All about natural size. 



Boreotrophon miilticostatiis Eschscholtz Many-ribbed Trophon 



Figure 46c 



Bering Sea to San Pedro, California. Northern Japan. 



I to i^ inches in length, short canal, deep suture, 5 or 6 whorls are 

 shouldered above. Characterized by the flaring thin lip, brownish aperture, 

 8 to 10 lamella-like ribs per whorl, and weak microscopic spiral threads. 

 Moderately common; littoral in Alaska, 10 to 30 fathoms in Puget Sound. 



Stuart's Trophon 



Plate 24) 



Boreotrophon stiiarti E. A. Smith 



Alaska to San Diego, California. 



2 inches in length, waxy texture, pure-white to yellow-cream, with 9 

 to 1 1 strong, lamella-like, high-shoulder ribs per each of the 7 whorls. Whorls 

 in spire cancellated by the 2- or 3 -spiral raised cords. Body whorl with 5 

 very weak spiral rounded threads. B. s?mthi Dall is the same. Uncommon 

 from low tide (in Alaska) to 25 fathoms. 



