590 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.45. 



internally with nine or ten short lirse, the series not extending to the 

 extremes of the lip; canal short, deep, rather markedly recurved. 

 Height of shell 19; of last whorl 13; of aperture 10; maximimi 

 diameter 9 mm. The same dimensions in A. modesta average 

 respectively 24, 17, 13, and 10 mm. 



Head of the Gulf of California, Dr. E. Palmer, Cat. No. 182587, 

 U.S.N.M., also at station 3034, in 24 fathoms oflf Point Fermin in 

 the Gulf, by the U. S. Bureau of Fisheries steamer Albatross. 



AMPHISSA (COSMIOCONCHA) PERGRACILIS, new species. 



Shell elongate, slender, whitish, with brownish flammules, part of 

 which are grouped in an obscure band in front of the suture; nucleus 

 lost; subsequent whorls about eight, moderately convex, with no 

 line in front of the rather deep suture; spiral sculpture on the canal 

 and base of about 20 channeled grooves with wider flattish inter- 

 spaces; aperture elongate, the inner lip, as far as the end of the 

 canal with a rather thick layer of white callus; outer lip sharp with 

 a feeble varix behind it and with about 15 fine lirations internally; 

 canal short, wide, slightly recurved. Height of shell 24; of last 

 whorl 15; of aperture 10; maximum diameter 7 mm. 



Dredged at station 3017 on the west coast of Mexico, in 58 fath- 

 oms, green mud, off Cape Lobos. Cat. No. 211030, U.S.N.M. 



This is much more slender than the preceding species. 



AMPmSSA (COSMIOCONCHA) PARVULA, new species. 



Shell small, pale olivaceous, slender, of about 7 moderately convex 

 whorls; suture distinct, minutely channeled, without any depressed 

 line in front of it; sculpture of incremental lines and on the base 

 and canal about 25 channeled grooves with flattish, wider interspaces; 

 the grooves grow fainter and narrower and the interspaces wider, 

 till the sculpture becomes obsolete near the periphery of the whorl; 

 aperture long and narrow, body with a light wash of callus; outer 

 lip sharp, simple, with a narrow but well-marked vaiix behind it, 

 internally with about 20 fine, sharp, short lirations which extend 

 practically the whole length of the aperture; canal wide, deep, 

 slightly recurved. Height of shell 15; of last whorl 10; of aperture 

 6.5; maxunum diameter 5 mm. 



Dredged at station 2996, off La Paz Bay, Gulf of California, by 

 the U. S. Bureau of Fisheries steamer Albatross in 112 fathoms, green 

 mud. Cat. No. 211029, U.S.N.M. 



At first sight this looks like a miniature A. pergradlis, but on 

 closer scrutiny it is seen to have differential characters Ouher than 

 those of size. 



LIOTIA CTTRIOA, new species. 



Shell small, duU red or purplish brown, more or less articulated on 

 the ridges, of about four and a half whorls; nucleus minute, flattish; 



