180 CADULUS-GADILA. 



Commission Station 3,354, in the Gulf of Panama. Types are No. 

 122,992, U. S. Nat. Mus. 



C. PLATYSTOMA Pilsbry & Sharp, n. sp. PI. 35, figs. 17, 18. 



Shell rather large, much bent ; bluish-white, somewhat translu- 

 cent posteriorly ; smooth and gloss}', growth-strije being scarcely 

 discernable. Strongly swollen posteriorly, the greatest diameter 

 contained about 4'4 times in the length of the shell ; equator between 

 the anterior third and fourth of the shell's length, the tube rapidly 

 tapering posteriorly, less rapidly anteriorly, where it is decidedly de- 

 pressed or fattened on the convex face, the flattening increasing to- 

 ward the aperture, just behind which there is a slight concavity on 

 the middle of the convex side (fig. 18). Outline of convex side de- 

 cidedly more arcuate toward the aperture ; concave outline modified 

 and slightly convex in the region of the inflation. Posterior end 

 attenuated. Tube compressed between the concave and convex 

 sides at and anterior to the inflation, subcircular in section at the 

 apex. Aperture irregularly elliptical, much fattened along the con- 

 vex side, the peristome thin, jagged from fracture. Anal orifice sub- 

 circular, with simple edge. 



Length 12'7 ; diam. at aperture, 1'3 x 2.0, at greatest inflation 2*52 

 x2*92, at apex 0.8 x 0"8 mill, (the antero-posterior dimensions pre- 

 ceding). 



Off Manta, Ecuador, U. S. Fish Commission Station, 2792 in 401 

 fms. mud, bottom temp. 42°.9 F. (Albatross). 



Somewhat like C. poculum in being much bent, with the tube 

 markedly compressed anteriorly, but in the Pacific species the infla- 

 tion is much more extensive and not angular, the posterior attenua- 

 tion less great, etc. It differs from C. dalli in being more bent, 

 without apical nicks, and conspicuously in the shape of the aperture. 

 In the form of the aperture it is somewhat similar to C. albicomatus, 

 but that is a sculptured species. 



The unique type is No. 107,699, U. S, Nat. Mus. 



C. CALiFORNicus Pilsbry & Sharp, n. sp. PI. 34, figs. 5, 6, 7, 8. 



Shell large and solid, well curved ; smooth and glossy, growth- 

 lines being very faintly indicated ; opaque white, the posterior half 

 bluish, subtranslucent, with a similarly colored rim at the mouth, or 

 sometimes slightly bluish throughout. Stout, decidedly swollen an- 

 teriorly, the greatest diameter contained 4i to 41 times in the length 

 of shell ; the equator about at the anterior fourth, either oblique. 



