386 Trans. Acad. Sci. of St. Louis. 



drawn from a fine series of specimens will not be out of 

 place. 



Shell fusiform, yellowish, with three varices; varices sub- 

 spinose; spirally lirate, the lirae coarse, equidistant; one node 

 between the varices ; spire elongated, scalar; apex consisting 

 of two roundish, nearly smooth whorls; whorls 7, shouldered 

 and considerably angulated below the sutures ; sutures hardly 

 impressed ; aperture oblong-oval, smooth inside, produced 

 anteriorly into a moderate, closed canal; outer lip provided 

 with short digitations : columella arcuate, white, smooth, con- 

 tinuous above with the outer lip; below, and near the old 

 canal-end, it is raised in a thin lamina; color yellowish, with 

 a greenish tinge ; the tip of the canal inside and the throat 

 marked with purple. Operculum with the nucleus at the 

 lower, outer edge. 



Alt. 60, diam. 30 mill., aperture alt. 17, diam. 10 mill. 

 California and Lower California. 



This species is quite distinct from Ocinehra tridlata Sowb., 

 a synonym of which many authors have considered it. 



Genus Muricidea (Swainson) Morch. 



Muricopsis Bucquoy and Dautzenberg (Moll. Marins du 

 Roussilon, p. 19, pi. i, figs. 5, 6, 1882) is a synonym. 



Muricidea cristata Brocchi. 



Murex cristatus Brocchi, Conch. Foss. sub-app., p. 394, pi. vii, flg. 15. 



Murex porrectics LiOCSLvd (Ann. Soc. Linn. Lyons, XXXII, 

 p. 221, 1885) is a synonym of variety Blainvillei Payr. 

 Murex inermis Monter., described on same page, is also a 

 synonym. In 1840 Sowerby described a Murex inermis in 

 Zool. Proc. 



Genus Urosalpinx Stimpson. 



This genus differs from Muricidea (with which some authors 

 have confounded it) in its operculum, which combines the 

 characters of both Murex and Purpura. Externally it is like 

 Murex and internally it is like Purpura , showing the peculiar 



