24 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



the range of variation requires thorough investigation before one 

 can be certain of the specific status of any of them. 



CRASSISPIRA EPICASTA, new species. 



Plate 7, fig. 4. 



Shell small, slender, acute, black, or very dark reddish brown, 

 with two smooth nuclear whorls, the second with a peripheral keel, 

 and seven subsequent whorls; suture obscure, appressed, with a 

 marked thread at its edge ; spiral sculpture of fine spiral striae over 

 the entire shell, and (on the spire two or three, on the last whorl 

 eight) stronger cords undulated but not nodulated where they pass 

 over the axial sculpture, and separated by wider interspaces; the 

 anal fasciole hardly constricted; axial sculpture of fine sharp in- 

 cremental lines cutting the minor spirals and, on the last M^horl about 

 13 low rounded ribs extending from the fasciole nearly to the canal 

 but not conspicuous anywhere, with equal or narrower interspaces; 

 aperture small, dark brown, the anal sulcus shallow- and the thin 

 outer lip only moderately arcuate; inner lip and pillar simple, canal 

 short, hardly differentiated from the aperture. Height of shell, 9; 

 of last whorl, 4.5 ; diameter, 3.5 mm. Cat. No. 204102, U.S.N.M. 



Range. — Beach of Taboguilla Island, Panama Bay ; U. S. Bureau 

 of Fisheries. 



CRASSISPIRA BRIDGESI, new species. 



Plate 7, fig. 7. 



Shell small, solid, grayish, with six whorls exclusive of the (lost) 

 nucleus; suture strongly appressed, obscure with a thread-like edge 

 in front of which is a narrow spirally striated space bordered in front 

 by a larger cord forming the posterior margin of the anal fasciole ; 

 the fasciole is strongly constricted, undulated by the ribs and spirally 

 striated; other spiral sculpture of (on the upper whorls one, on 

 the later two) peripheral cords which are swollen where they pass 

 over the ribs and on the anterior of which the suture is laid ; on the 

 last whorl there are six such cords with much wider spirally striated 

 interspaces, and about five closer threads on the canal ; axial sculpture 

 of (on the last whorl six) strong rounded ribs almost continuous up 

 the spire, most prominent at the periphery and feeble on the base; 

 aperture narrow, with a varicose rib behind it; anal sulcus short, 

 with a strong subsutural callus, inner lip erased, pillar with a thin 

 layer of callus, smooth, short, with a very short deep canal forming 

 an evident siphonal fasciole. Height of shell, 11 ; of last whorl, 5.5 ; 

 diameter, 5 mm. Cat. No. 55254, U.S.N.M. 



Range. — Panama, in the Stearns collection, collected by Thomas 

 Bridges. 



This shell, being somewhat bleached, is probably of a darker color 

 when fresh. 



