K0.2217. THE GENUS EPITONIUM AND ITS ALLIES— DALL. 481 



from Panama, and I feel some doubt as to whether the Califomiau 

 species is conspecific with that from Panama, but the question can 

 only bo settled by a comparison with the type in the British Museum. 



EPITONIUM COLUMBIANUM, new epecles. 



Shell acute, yellowish white, with nine whorls exclusive of the (lost) 

 nucleus; varices 18, low, roimdcd, more or less striated, without any 

 angulation, continuous over the suture into which they dip and 

 nearly encircling the spire; the t3^pe-specimen has the interspaces 

 more or less finely axially striated, but the southern specimens seem 

 quite smooth; base and aperture rounded, the anterior margin of the 

 latter slightly angular. Length, 21; diameter, 7.5 mm. U. S. Nat. 

 Mus. Cat. No. 111211. Range, off the Columbia River, Oregon, in 

 27 fathoms, and south to Point Abreojos, Lower California, in 44 

 fathoms. 



The most prominent characteristic of this species is the regularity 

 of all its features. It is the largest of those species of the coast which 

 have imarmed varices. 



EPITONIUM SAWINAE Dall. 1907. 



This species has 16 to 19 varices more or less flatly reflected on tho 

 base, and ranges from Vancouver Island to San Diego, California, 

 and possibly to the Gulf of CaUfornia. 



EPITONIUM SAWINAE, variety? CATALINENSE, new rariety. 



Shell with a small three-whorled nucleus, smooth and white, and 

 seven and a half subsequent whorls; varices 22 to 24, not spinose or 

 angular, not regularly continuous over the suture, with tho anterior 

 faces of the varices finely lamellose or deeply striated. Base rounded 

 with a minute umbilical perforation in the adult; aperture nearly 

 circular. Length, 13.5; diameter, 6 mm. U. S. Nat. Mus. Cat. No. 

 109502. Range, off Catalina Island, California. 



It differs from sawinae by the absence of angularity on and the 

 greater number of the varices, and by tho umbilical perforation, 



EPITONIUM MONTEREYENSE, new Bpecles. 



Shell small, white, rather solid, with six whorls, exclusive of the 

 (lost) nucleus; varices 14, low, rather solid, striated, not angulated, 

 largely continuous over the suture, encircling about one-fourth of 

 tho spire, widely flatly reflected on the base, the reflection covering 

 at least half the interspace, the whole giving tho effect of a disk 

 though there is no basal disk or cord; aperture subovate, the ante- 

 rior margin somewhat produced. Length, 6; diameter, 2.5 mm. 

 U. S. Nat. Mus. Cat. No. 111217. Range, Monterey Bay, in 30 

 fathoms. 



77403— Proc. N. M. vol. 53—17 31 



