78 PROCEEDINGS OF THE \ATIONAL MUSEUM. ^'ol. 5e. 



normal adult sculpture on five succeeding whorls; spiral sculpture 

 of fine equal close-set threads, covering the posterior half of the whorl 

 and on the anterior half similar but slightly larger threads, while 

 on the fourth whorl there is one, on the fifth and sixth whorls two, 

 and on the last whorl three, slightly larger threads near the periphery 

 which are somewhat swollen where they override the ribs; between 

 the peripheral pair of these are three or four of the minor threads; 

 axial sculpture of eight rounded nearly vertical ribs extending from 

 suture to suture on the spire and nearly to the canal on the last whorl 

 with subequal interspaces, not continuous over the suture which is 

 distinct and not appressed ; the whorls are moderately convex ; aper- 

 ture rather narrow, the anal sulcus proportionately large and rounded, 

 the outer lip varicose and infolded, with a sharp edge; the throat 

 smooth, white; the inner lip smooth, the pillar very short, straight, 

 the canal hardly differentiated. Height of shell, 6.5 ; of last whorl, 

 5 ; diameter, 2.2 mm. Cat. No. 274105, U.S.N.M. 

 Range. — Panama, in beach drift; James Zetek. 



CYTHARELLA AMATULA, new species. 

 Plate 21, fig. 2. 



Shell small, pale waxen yellow, with occasional brown spots be- 

 tween the ribs, with about one and a half smooth white nuclear and 

 about five and a half subsequent whorls; axial sculpture of (on the 

 last whorl eight) stout protractively arcuate ribs with subequal or 

 narrower interspaces not continuous up the spire, but extending from 

 the suture over a slight shoulder to the canal; spiral sculpture of 

 numerous fine sharp striae covering the shell (except on the anal 

 fasciole) with flattish wider interspaces; there is a slight angle at 

 the shoulder; aperture narrow, the outer lip infolded, the anal sulcus 

 large, the canal hardly differentiated, the pillar smooth. Height, 

 6.5 ; diameter, 3.0 mm. Cat. No. 127534a, U.S.N.M. 



Type-locality. — San Diego, California. 



This is one of the species which approaches in form the MangUia 

 type. 



CYTHARELLA PHAETHUSA, new species. 



Plate 24, fig. 1. 



Shell minute, with a very small turbinate brown nucleus of about 

 two and a half whorls, the latter part of which is feebly reticulately 

 sculptured, and three and a half subsequent whorls; suture distinct, 

 not appressed, whorls moderately rounded, whitish with a pinkish 

 brown banded base; spiral sculpture of (on the first whorl one, on 

 the second two) peripheral strong threads, on the last whorl four 

 with much wider striated interspaces; these threads on dead speci- 

 mens show paler than the general surface; on the base and canal 

 are about a dozen smaller close-set threads; none of the threads 



