CLASS GASTROPODA 
55 
gyrate, about a narrowly pervious axis. Long, of shell, 25; of last whorl, 
6; of aperture, 3; max. diam., 5 mm. (Dali.) 
Type in United States National Museum, No. 123036. Type locality, 
U.S.S. “Albatross” Station 3427, near the Tres Marias Islands, in 50 
fathoms. 
Range. Catalina Island, California, to Panama Bay. 
Turritella cooperi Carpenter, 1866 
Proceedings of the California Academy of Sciences, 3:216. Tryon, Manual of Con¬ 
chology, 8: 200; PI. 61, fig. 61. 
T. t. valde tereti, tenuiore, cinerea, rufo-fusco tincta; anf. plurimis, 
angustis, subplanatis, suturis distinctis; liris ii. et striulis crebris spiraliter 
ornata; basi angulata; apertura subquadrata; labro valde sinuato. Long., 
1.80; long, spin, 1.50; lat., 0.45. (Carpenter.) 
Whorls about 17, slopingly flattened, excavated at the suture, two- 
ridged and finely striated spirally, the last whorl doubly ridged below, with 
a single ridge above; yellowish, longitudinally flamed with chestnut or 
chocolate. Length, 1.75 in. (Tryon and Pilsbry, Manual of Conchology.) 
Type in State Collection, No. 564. Type locality, San Pedro, Cali¬ 
fornia. 
Range. Monterey to San Diego, California. 
Turritella nodulosa King, 1831 
Zoological Journal, 5: 347. Tryon, Manual of Conchology, 8 : 202; PL 63, figs. 78, 79. 
Testa elongato-turrita; anfractibus striatis; striis duabus maximis sub- 
nodulosis. (King.) 
The two large striae, which are remarkable for the nodules, are not 
far from the middle of each whorl, and generally are nearer the upper 
suture: of these the lowest is the larger. (King.) 
Whorls 14 or 15, nodulously ridged, a central ridge usually stronger, 
making an angulation, concave arid striate in the middle; light yellowish 
brown, longitudinally chestnut-flamed between the nodules. Length, 2 
inches. (Tryon.) 
Type in British Museum. Type locality not known to writer. 
Range. San Diego, California, to Panama. 
Genus TACHYRHYNCHUS Morch, 1868 
Shell like a small Turritella, the whorls of the spire grooved across, 
and rounded; sculptured by spiral and longitudinal lines. Aperture oval, 
slightly produced in front into a rudimentary channel; lip sharp. 
Example. Turritella acicula Stimpson. 
Distribution. Arctic to San Pedro, California; also Atlantic. 
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