CLASS GASTROPODA 
39 
lation. Upon the body-whorl, toward the lower part, they cease to be 
erect, are lapped one upon another, and form an imbricated caudal ridge 
subparallel with the canal. The entire surface is both spirally and longi¬ 
tudinally minutely striated, a feature observable only under a lens. 
Type in Dr. J. Percy's Collection. Type locality, Vancouver Island, 
British Columbia. 
Range. Shumagin Islands, Alaska, to San Diego, California. 
SECTION TROPHONOPSIS Bucquoy, Dautzenberg, and Dollfus, 1882 
Trophon tenuisculptus Carpenter, 1866 
Plate 30, figs. 3, 7 
Annals and Magazine of Natural History , series 3, 17 :277. Tryon, Manual of Con- 
chology, 2:139; PI. 33, fig. 359. 
T. testa T. barvicensi simili, sed sculptura minus extante; vertice 
nucleoso minimo; anfractibus uno et dimidio lsevibus, apice acuto; nor- 
malibus v., tumidis, postice subangulatis, suturis impressis; costis radianti- 
bus x-xiv, plerumque xii, baud varicosis, angustis, obtusis; liris spiralibus 
majoribus, distantibus, quarum ii-iii in spira monstrantur, aliis inter- 
calantibus, supra costus radiantes undatim transeuntibus; toto superficie 
lirulis incrementi, supra liras spiralis squamosis, eleganter ornata; canali 
longiore, subrecta, vix clausa; labro acutiore, postice et intus incrassato, 
dentibus circ. v munito; labio conspicuo, laevi; columella torsa. (Car¬ 
penter.) 
Shell small, fusiform; whorls five, angulated above, forming a slightly 
sloping, tabular band above; ornamentations of numerous transverse ridges 
and several spiral lines; suture deeply impressed; aperture elliptical; outer 
lip thin ; inner lip incrusted, smooth ; canal narrow ; columella long, twisted. 
(Arnold.) 
Type in British Museum? Type locality, Pleistocene of Santa Barbara, 
California. 
Range. Southeastern Bering Sea to Todos Santos Bay, Lower Cali¬ 
fornia. Fossil: Pleistocene—Santa Barbara, California; Pliocene, San 
Pedro, California. 
Trophon lasius Dali, 1919 
Proceedings of the United States National Museum , 56:338. 
Shell fusiform, slender, white, with a dingy brownish periostracum and 
more than five whorls, the apex defective; suture distinct, the whorls 
prominently rounded; axial sculpture of numerous elevated incremental 
lines which imbricate or nodulate the spiral sculpture at their intersections; 
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