CLASS GASTROPODA 
115 
thick; columella oblique, curved and strongly revolute; parietal wall cov¬ 
ered by a strong callus. Length, 8; diameter, 2.6 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 160206. Type locality, 
St. Paul, Kodiak, Alaska. 
Range. Kodiak to Sitka, Alaska. 
Turbonilla chocolata Carpenter, 1866 
Plate 50, figs. 9, 9a 
Proceedings of the California Academy of Sciences, 3:220. Bulletin 68, United States 
National Museum, 70; PI. 5, figs. 9, 9a. 
Ch. t. C. tridentatae magnitudine et indole simili; sed teretiore, dense 
castanea, fasciis pallidioribus sub epidermide adhaerente ornata; anfr. 
primis gracillimis; vert. nucl. anfr. iii. helicoideis, valde decliviter sito, 
marginibus spirae rectis, angustis, haud superante; anfr. norm. xii. plana- 
tis, primis tumidioribus, suturis impressis; costis circ. xxviii. rotundatis, 
validis, circa basim prolongatam haud subito evanidis, anfr. ult. saepe 
obsoletis; interstitiis haud aequantibus, haud undatis, haud sulcatis; tota 
superficie sub lente minutissime et creberrime spiraliter striulata; apertura 
ovali, columella parum contorta, labro intus tenui, haud dentato. Long., 
0.55 ; long, spir., 0.43 ; lat., 0.13 poll. (Carpenter.) 
Shell slender, elongate-conic, uniformly golden-brown, shining. Nuclear 
whorls very small, planorboid, two and one-half, having their axis at right 
angles to that of the succeeding turns; not immersed. Post-nuclear whorls 
rather high between the sutures, slightly shouldered at the summit, flat¬ 
tened on the posterior three-fourths between the sutures; rounding on 
the anterior fourth to the somewhat contracted suture. Axial ribs slightly 
retractive, well-rounded, 22 upon the first eight whorls, 24 upon the ninth, 
and 28 upon the tenth ; on the penultimate whorl they are poorly developed, 
split, and otherwise indicating a senile stage. Sutures well-impressed. 
Periphery and base of the last whorl inflated and well-rounded. The en¬ 
tire surface of the base and spire marked by numerous fine, wavy, closely 
spaced, spiral striations. Aperture oval; posterior angle acute; outer lip 
thin, showing the external sculpture within; also three bands of color upon 
a bluish-white surface, one immediately below the summit, another cover¬ 
ing the part corresponding to posterior half of the base, and a narrow one 
dividing the space between these two areas in equal halves; columella 
curved, moderately strong, and revolute. (Bartsch.) 
Type in California State Collection, No. 428. Type locality, San Pedro, 
California. 
Range. Known only from type locality. 
Described as Chemnitzia chocolata. 
[413] 
