Page:American Seashells (1954).djvu/257

Rh described, and we have figured the subspecies scalariformis Gould, commonly dredged in the Grand Banks.

Boreotrophon scitulus Dall Handsome Trophon Figure /d

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.

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.

Boreotrophon stiiarti E. A. Smith Stuart's Trophon Plate 24)

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.