480 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



EPITONIUM APICULATUM, new species. 



Shell small, white, with a smooth slender elevated nucleus of two 

 and a half whorls and five rapidly enlarging subsequent whorls; 

 varices eight, sharp, high, thin, with an acute angle at the shoulder, 

 continuous over the deep suture into which they dip, half encircling 

 the spire; on the base the varical edges are flatly reflected; on the 

 later whorls the shoulder angle becomes a prominent spine ; aperture 

 ovate, slightly produced in front. Length, 4; diameter, 2 mm. U. 

 S. Nat, Mus. Cat. No. 111219. Range, Lower California to Panama 

 Bay, in 30 fathoms. 



EPITONIUM COMPRADORA, new species. 



Shell minute, white, with a very small acute nucleus of two and a 

 half smooth whorls and five or more rapidly enlarging subsequent 

 whorls separated by a rather deep suture; varices 13, with a blunt 

 angle at the suture, giving the profile of the whorls a somewhat tabu- 

 late aspect; varices thin, sharp, erect; base rounded, aperture subo- 

 vate, anterior faces of the varices smooth. Length, 4; diameter, 2.5 

 mm. U. S. Nat. Mus. Cat. No. 105527. Range, Point Abreojos, 

 Lower California, to the Gulf of California, 



Possibly immature, but apparently distinct from the young of any 

 of the allied species. 



EPITONIUM CYLINDRICUM, new species. 



Shell small, white, thin, subcylindrical, with five whorls exclusive 

 of the (lost) nucleus; suture moderately deep; varices 13, low, 

 thread-like, not continuous over the suture, not angulate; base 

 evenly rounded, aperture subovate. Length, 4; diameter, 1.5 mm, 

 U. S. Nat. Mus. Cat. No. 271037. Range, near La Paz, Lower Cali- 

 fornia, in 21 fathoms. 



EPITONIUM CENTRONIUM, new species. 



Shell small, white, acute, slender, with three elevated smooth 

 nuclear and about five subsequent whorls ; suture deep ; varices nine, 

 thin, sharp, erect, with a spinose angle about halfway between the 

 suture and the periphery, continuous over the suture on the spire 

 which they nearly encircle; terminal varix duplex, anterior faces of 

 the varices striated; aperture rounded, the inner margin buttressed 

 by the preceding varices, not touching the body whorl. Length, 4.5; 

 diameter, 2 mm. U. S. Nat. Mus. Cat. No. 211395. Range, Gulf of 

 California, in 7 to 26 fathoms. 



EPITONIUM TIARA Carpenter, 1856. 



This species has 12 varices and ranges from Catalina Island to 

 Todos Santos Bay, Lower California, according to specimens so named 

 by Carpenter in the Stearns collection. It was originally described 



