54 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Distribution. World-wide, ranging from the Laminarian Zone to 
100 fathoms. West Indies, United States, Britain, Iceland (esp.), Medi¬ 
terranean, West Africa, China, Australia, West America. Fossil, Triassic; 
Britain, North and South America, Australia, Java. 
Turritella jewetti Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 655. 
Annals and Magazine of Natural History, ser. 3, 17:276. 
T. testa satis tereti, baud tenui, cinerea rufo-fusco tincta; anfr. sub- 
planatis, suturis distinctis; lirulis distinctibus (quarum t. jun. duae extan- 
tiores) et striolis subobsoletis spiralibus cincta; basi parum angulata; 
apertura subquadrata; labro tenui, modice sinuato. (Carpenter.) 
Shell turreted, with slender, tapering spire; number of whorls variable; 
whorls flat, with two distinct spiral ridges on anterior portion and three 
or four less distinct ridges posteriorly; incremental lines distinct and con¬ 
cave anteriorly; suture thread-like and rather indistinct; not usually 
impressed; aperture angular. (Arnold, Paleontology of San Pedro , Cali¬ 
fornia.) 
Type in United States National Museum. Type locality, Santa Bar¬ 
bara, California. Pleistocene. 
Range. Santa Barbara, California, to Salina Cruz, Mexico. Fossil: 
Pleistocene—Santa Barbara to San Pedro, San Diego, California; Plio¬ 
cene, San Diego Well, San Pedro, California. 
Turritella mariana Dali, 1908 
Bulletin, Museum of Comparative Zoology, 43:327; PI. 11, fig. 14. 
Shell slender, pale pinkish-brown, acute, with about eighteen whorls; 
suture rather obscure, not appressed; whorls strongly constricted in the 
middle, a sharp keel on each side of the constriction, which in the last two 
or three whorls is undulate or obscurely beaded; nucleus lost; on the 
earlier whorls the keels are entire and the whorl slopes about the same 
distance from each to the adjacent suture; on the latter whorls there is a 
single thread behind the posterior keel, and two more are in the trough 
between the two keels, all somewhat undulate, low, and inconspicuous; 
base of the whorls with a sharp carina upon which the suture is laid; 
within the carina deeply concave, with well-marked lines of growth and 
microscopic spiral striae; aperture rounded-quadrate, the outer lip with 
the margin at first retractive to a wide sinus nearly coincident with the 
posterior keel, then prominently protractive to the basal keel, thence in a 
deeply excavated curve to the pillar, which is thin and arcuate, short, and 
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