58 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Tachyrhynchus lacteolus Carpenter, 1865 
See Part II, Plate 31, fig. 11 
Proceedings, Philadelphia Academy of Natural Sciences, 62. 
M.t. parva, tereti, tenui, albida; epidermide tenui, flavida, induta; anfr. 
x. rotundatis, suturis valde impressis, laevibus; costis circ. xii. radiantibus, 
tumentibus, suturam versus evanidis, interstitiis parvis; costis spiralibus 
rotundatis, costas radiantes transeuntibus, supram iii. validioribus, aliis 
interdum intercalantibus; costulis suturalibus parvis, antice ii.; basi rotun- 
data, vix striata; columella recta, paulum effusa; labro tenuissimo, parum 
arcuato. Long., 33; long, spir., 24; lat., 14. (Carpenter.) 
M. with small shell, rounded, slender, whitish; covered with a thin 
yellowish epidermis ; with ten rounded whorls, with suture strongly im¬ 
pressed; with about 12 radiating costae, swelling, and becoming obsolete 
toward the suture; with small interstices; with rounded spiral costae 
crowning the radial costae, with the upper three stronger, with others 
sometimes intercalating; with smallish sutural costae, 2 in front, with 
rounded base, scarcely striate, with straight columella, spread out gradu¬ 
ally; with very thin outer lip, slightly arcuate. (Translation.) 
Type in ? Type locality, Vancouver district. 
Range. Chinik Bay, Alaska Peninsula, east and south to Point Abre- 
ojos, Lower California. 
Described as Masalia. 
Tachyrhynchus lacteolus subplanatus Carpenter, 1865 
Proceedings, Philadelphia Academy of Natural Sciences, 62. 
M. t. M. lacteolac simili; sed sculptura minus extante anfractibus 
subplanatis; costis radiantibus pluribus minoribus, costulis spiralibus inter¬ 
dum intercalantibus, aperturam versus saepe obsoletis. (Carpenter.) 
M. with shell like M. lacteolae; but with sculpture less pronounced on 
the flattened whorls; with many smaller radiating costae, and sometimes 
with secondary intercalating costae, often obsolete toward the aperture. 
(Translation.) 
Type in ? Type locality, Puget Sound, Washington. 
Range. Puget Sound to San Diego, California. 
Described as Mesalia lacteola subplanatus . 
Genus TURRITELLOPSIS G. O. Sars, 1878 
Shell, like Turrit el la, but the lingual dentation differs. (Tryon, Struc¬ 
tural and Systematic Co'nehology.) 
Type. Turritellopsis acicula Stimpson. 
Distribution. Boreal. 
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