ACADEMY OF NATURAL SCIENCES. 185 



Hab. Catalina Island, 40 fms. Dr. Cooper. 

 No. 1052, Mollusca, Survey Cabinet. 



DAPHNELLA, Hinds. 



D. CLATHRATA, G. 



D. t. parva, fusiformis, tenuis ; anfr. Ill nucleosis, laevibus ; anfr. normalibus 

 III -|- supra oblique truncatis ; superficie eonfertim clathrata ; striis radiantibus 

 obsoletis circa basim ; apertura magna; columella parum tortuosa ; labio paruin 

 incrassato; labro acuto; sinu postico sub-profundo, supra acuto, ad suturam attin- 

 gente ; colore albido, sparsim brunueo punctato. 



Long. -37, lat. -14, long. aper. "22. 



Shell small, fusiform, thin, aperture longer than the spire; nuclear whorls three, 

 smooth ; normal whorls three or more, obliquely truncated above, convex below, 

 this truncation is partially obsolete on the last whorl ; surface closely clathrate, 

 except on the lower part of the last whorl where the radiating lines become ob- 

 solete ; aperture large, columella somewhat twisted, slightly encrusted ; outer lip 

 thin, acute, posterior sinus moderately deep and narrow, adjoining the suture and 

 angular at its upper corner; color, brownish white with minute brown spots 

 sparsely scattered, usually placed on the larger of the revolving ribs. 



Hab. Santa Catalina Island, 60 fms. Dr. Cooper. 



This little shell looks not unlike the young of Pleurotoma Carpenteriana, supra, 

 but on a critical comparison, shows several characters incompatible with such a 

 reference ; the strongest of these is the peculiar shape of the posterior sinus. In 

 addition to this, the whorls of the present species are much more numerous in 

 proportion to the size, the first six whorls of P. Carpenteriana making a shell 

 three or four times the diameter of this one. 



No. 1053, Mollusca, Survey Cabinet, 



MANGELIA, Leach. 



M. HEXAGONA, G. 



M. t. parva, fusiformisf gracilis ; apice sub-acuto; anfr. II laevibus; anfr. norma 

 libus V, costis radiantibus VI acutis induta; tota superficie minute et eonfertim 

 clathrata ; colore albido, lineis rufo-brunneis spiralibus fasciato ; apertura angusta; 

 columella vix tortuosa, labro acuto; sinu postico lato, haud profundo. 



Long. "34, lat. "1, long. aper. '15. 



Shells small, slender, fusiformis ; spire sub-acute, nuclear whorls two, smooth, 

 normal whorls five, slightly sub-angular and ornamented -by six large acute radiat- 

 ing ribs with broad concave interspaces ; besides these, the whole surface is can- 

 cellated by minute raised lines ; color brownish white ornamented by a few red- 

 dish brown revolving bands, one much larger than the rest, in the middle of the 

 whorl ; aperture narrow, columella very slightly twisted ; outer lip acute, sinus 

 almost obsolete. 



Hab. one specimen from Catalina Island, 40 fms., another from the beach at 

 Monterey. Dr. Cooper. 



No. 425, Mollusca, Survey Cabinet. 



