18 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
regular, sometimes rising to lamellae, forming pits in the interspaces of 
the spiral sculpture; the latter comprises (on the penultimate whorl, 5 or 6 • 
on the last whorl, about 14) strong, elevated, blackish-brown, more or les^ 
undulated and transversely striated squarish ribs with narrower inter, 
spaces, covering the whole whorl; aperture ovate, purplish when fresh > 
fading to light pink in the cabinet; outer lip strong, crenate by the sculpv. 
ture, internally thickened, and with six prominent denticles; inner lip 
erased, pillar short; canal very short, but distinctly recurved. Height of 
shell, 16.5; of aperture, 12.5; diameter, 13 mm. (Dali.) 
Type in United States National Museum, No. 208495. Type locality s 
Moss Beach, Halfmoon Bay, California. 
Range. Moss Beach to San Luis Obispo, California. 
Tritonalia lurida munda Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 663. Pros 
ceedings of the United States National Museum , 15; PI. 20, fig. 3, 1892. 
In a starved condition, it is a narrow, small form. Tall with faint 
sculpture. (Carpenter.) 
Range. Middleton Island, Alaska, to San Diego, California. 
Tritonalia squamulifera Carpenter, 1868 
Gabb, Paleontology of California, 2:44. 
1. satis turrita, pallide rufofusca; anfr. nucl. ?norm. iv tabulatis, tumen- 
tioribus, suturis ad angulum 80°—100° acute impressis; costis rad. vii— 
xxvii vix varicosis, angustis, ad angulum posticum interdum spinosis, ad 
basim continuis; liris spiralibus primum iii fenestratis dein creberrimis, 
asperis, squamulatis, interstitiis angustis, plus minusve incisis, canali 
longiore, rectiore, duabus trientibus aperturae aequante, vix aperta; aper- 
tura ovali, labro incrassato, intus circ. v dentati; labio laevi, crassiore. 
Long., .9; long, spir., .35; lat., .51 poll. (Carpenter.) 
With the general aspect of T. tenuisculptus, it is at once recognized 
by the difference in sculpture. The fossil (unique) specimen is much finer 
than the immature living one sent by Dr. Cooper. In this the varices are 
not spinous at the angle, and the spiral sculpture is stronger. (Gabb.) 
Type in Philadelphia Academy? Type locality, Catalina Island, Cali¬ 
fornia. 
Range. Santa Barbara to San Pedro, California. Fossil: Post-Pliocene 
—Santa Barbara, California. 
[3161 
