CLASS GASTROPODA 
79 
claw-like element; inner lip slender, slightly curved, somewhat revolute, 
free for its entire length ; parietal wall glazed by a thin callus. Length, 2.7; 
diameter, 1.1 mm. (Bartsch.) 
Type in United States National Museum, No. 215786. Type locality, 
San Diego, California. 
Range. Known only from type locality. 
Melanella ptilocrinicola Bartsch, 1907 
Plate 43, fig. 2; Plate 44 
Proceedings of the United States National Museum , 32:555; PI. 53; also 53:335; 
PI. 44, fig. 2, 1917. 
Shell elongate-conic, thin, polished, transparent, tinged with bluish- 
white (the dried animal showing through the upper whorls as a granular 
golden-yellow mass.) Whorls 11, increasing regularly in size, decidedly 
rounded, with the surface weakly malleated, having a few feebly developed 
varices which appear at irregular intervals as narrow opaque vertical bands. 
Summit of the whorls closely appressed to the preceding turn, the extreme 
edge forming a slender spiral sutural band. Last whorl quite strongly in¬ 
flated basally. Periphery and base well-rounded, marked like the spire. 
Aperture moderately large, suboval; outer lip thin, evenly curved; inner 
lip slender, vertical, slightly reflected; parietal wall covered by a thin cal¬ 
lus. Operculum thin, corneous. Length, 9.5 ; diameter, 3.9 mm. (Bartsch.) 
Type in United States National Museum, No. 195373. Type locality, 
United States Bureau of Fisheries Steamer “Albatross Station 3342, in 
1,588 fathoms. 
Range. Parasitic on Ptilocrinus, in 1,588 fathoms, off British Co¬ 
lumbia. 
Genus ENTOCOLAX Voight, 1888 
Entocolax ludwigi Voight, 1888 
Zeitschrift fur Wissenschaftlichc Zoologie, 47:658; Pis. 41-43. 
The description of this genus and species, the writer has not been able 
to get. 
Genus CYTHNA Carpenter, 1864 
Imbedded in starfish like Stylifer, from which it is distinguished by 
its normal nuclear whorls, and thin concentric operculum. (Tryon, Struc¬ 
tural and Systematic Conchology.) 
Type. Stylifer tumens, Carpenter. 
Distribution. West coast of North America. 
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