10 MOLLUSES FROM JVEST COAST OF AMERICA— BALL. vol. xviii. 



cally striate; aperture rounded, slightly angulated by the sculpture; 

 the outer lip thiu, sharp ; the inner reflected over part of the umbilicus. 

 Height, 28; diameter, 24 mm. The operculuni has four or live whorls. 



U. S. Fish Commission station 3432, in 1,421 fathoms, mud, in the Gulf 

 of California, oft' La Paz. 



Type.—yo. 122900, U. S. N. M. 



The single specimen obtained has repaired an injury of the base so 

 as to somewhat distort the umbilical region. Except for the presence 

 of an umbilicus this might well be referred to Tiircicula ov Batliyhem- 

 Mx, and examination of the anatomy may show that to be its proper 

 location. 



RIMULA (?) EXPANSA, new species. 



Shell low, rounded, expanded; apex small, prominent, subcentral, 

 recurved to the right; foramen like an exclamation point without the 

 dot ( '), the small end anterior, the suture in front of the foramen incon- 

 spicuous, marked by a narrow raised line on the interior of the shell; 

 anterior slope convex, gently rounded; posterior a little excavated; 

 sculpture of evenly spaced, similar, close, hue, rounded threads over- 

 running radiating, rounded, little elevated threads of three sizes, the 

 larger starting at the aj^ex, the others intercalary toward the periphery 

 as the interspaces widen; margin of the shell slightly crenulated by 

 the sculpture; interior smooth, yellowish white, the septum convexly 

 arched without buttresses. Height, 10; length, 32; width, 26 mm. 



U. S. Fish Commission stations 3358, in 555, and 3047, in 885 fathoms. 

 Gulf of Panama. 



Typc.—^o. 1220G7, U. S. N. M. 



This species recalls R. asfuriana, Fischer, but is lower and more 

 expanded, a thinner shell, and with more delicate sculpture. 



EMARGINULA FLABELLUM, new species. 



Shell small, translucent white, depressed, wider in front, narrow 

 behind, squarish at both ends, with the incurved apex terminal behind; 

 slit short, one-fourth as long as the shell, widest in front, straight; tiis- 

 ciole depressed, with an elevated keel on each side; sculpture of fine 

 concentric incremental lines and very tine elevated threads, which start 

 from the anal fasciole and curve outward toward the margin with very 

 few intercalated threads; margin smooth, interior polished, the fasciole 

 convex inward; front margin twice as wide as the posterior margin. 

 Length, 10; height, about 2.5 mm. 



U. S. Fish Commission station 291)2, in 460 fathoms, sand, oft" Clarion 

 Lsland, Lower California. 



The only specimen taken, though living, was slightly crushed. 



CHORISTES CARPENTERI, new species. 



Shell large, solid, of three and a half rounded whorls, covered with 

 a pale olivaceous epidermis, sculptured only with somewhat irregular, 



