80 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



prominent at the shoulder, but not continuous over the spire; aper- 

 ture narrow, outer lip varicose, thick, striated in front, smooth within, 

 the anal sulcus conspicuous but not deep ; inner lip smooth, the canal 

 hardly differentiated. Height of shell, 5 ; of last whorl, 3.5 ; diame- 

 ter, 1.75 mm. Cat. Nos. 2G8908 and 267640, U.S.N.M. 



Range. — Dredged at Agua Verde Bay and the head of Concepcion 

 Bay, Lower California, Dr. Paul Bartsch. 



CYTHARELLA (AGATHOTOMA) PENELOPE, new species. 



Plate 24, fig. 10. 



Shell minute, pale brownish, or whitish with obscure brownish 

 spiral band^, with a minute trochoid nucleus of three whorls the 

 earlier smooth, the last axially minutely closely ribbed, followed by 

 five subsequent whorls; suture distinct, hardly appressed, the whorl 

 sloping steeply away from it ; spiral sculpture of fine close-set threads 

 over the entire surface; whorls moderately convex; axial sculpture 

 of (on the last whorl six) prominent ribs, with much wider inter- 

 spaces, extending the whole length of the whorl and on the spire 

 more prominent at the periphery; aperture narrow, parallel-sided, 

 the outer lip varicose, smooth within, the anal sulcus wide and shal- 

 low, the canal hardly differentiated. Height of shell, 5 ; of last vi^horl, 

 3; diameter, 2 mm. Cat. No. (268908a) 266346, U.S.N.M. 



Range. — Agua Verde Bay, Lower California, Dr. Paul Bartsch. 



Some specimens are slightly larger, others smaller. 



CYTHARELLA (AGATHOTOMA) CAMARINA, new species. 



Plate 24, fig. 9. 



Shell small, white, hexagonal, with a blunt glassy nucleus of a 

 whorl and a half and about five subsequent whorls; surface showing 

 no spiral sculpture under a hand lens; axial sculpture of six strong 

 rounded ribs, running the whole length of the shell and continuous 

 over the spire; suture distinct; aperture narrow, with a relatively 

 large rounded anal sulcus, a thickened outer lip without internal 

 liration, the inner lip simple not callous, the pillar short, the canal 

 hardly differentiated. Height of shell, 6 ; of last whorl, 4.5 ; diameter, 

 2.5 mm. Cat. No. 122125, U.S.N.M. 



Range. — Indefatigable Island, Galapagos Islands, on the beach. 

 U. S. Bureau of Fisheries. 



CYTHARELLA (AGATHOTOMA) PHRYNE, new species. 



Plate 24, fig. 12. 



Shell small, fusiform, short, stout, whitish, with three obscure 

 pale brownish spiral bands on the last whorl ; nucleus minute, trans- 

 lucent, of about one whorl with somewhat over four subsequent 

 whorls; suture appressed, obscure; spiral sculpture of numerous 

 very fine equal close-set threads over the whole surface ; axial sculp- 



