350 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



in 5H fathoms, on green mud bottom, in the Bay of Panama. One 

 of these is a fragment containing the perfect tip and 10 whorls; the 

 other is an adult shell having lost the first one and a half turns 

 and having 13 whorls remaining, which measure — length, 10.3 mm.; 

 diameter, 4.3 mm. We have figured the larger of these tvv^o. Cat. 

 No. 251336, U.S.N.M., contains three yoimg specimens, dredged 

 by the United States Bureau of Fisheries steamer Albatross at sta- 

 tion 2799, in 29i fathoms on green mud, in the Bay of Panama. 



Sowerby's type was collected by Cuming, in the GuK of Nicoya, 

 Costa Rica, in 11 to 13 fathoms, in coarse sand. 



NISO LOMANA, new species. 



Plate 49, fig. 4. 



Shell large, broadly conic, yellowish-white. Early whorls well 

 rounded, later ones flattened, separated by a decidedly channeled 

 suture, narrowly shouldered at the summit and decidedly angulated 

 at the periphery, marked only by feeble axial fines of growth. The 

 summit of succeeding turns falls a little anteriorly to the angulated 

 periphery and forms a channeled suture. Aperture of the type 

 fractured. 



The type (Cat. No. 251337, U.S.N.M.) was dredged by the United 

 States Bureau of Fisheries at station 4310 in 71 to 75 fathoms, off 

 Point Loma, California, on green mud and fine sand bottom, bottom 

 temperature 49.7°. The type has lost the early whorls and the base. 

 The nine whorls remaining measure — Length, 14.5 mm. The frag- 

 ment of this large species, constituting the type, is so distinctive that 

 there will be no difficulty in recognizing this species when found 

 perfect. A second specimen (Cat. No. 211847, U.S.N.M.), which we 

 believe to represent the tip of this species, has seven whorls and was 

 dredged by the United States Bureau of Fisheries steamer Albatross 

 at station 2901, in 48 fathoms, off Santa Rosa Island, Cafifornia, on 

 mud bottom, bottom temperature 55°. 



NISO HIPOLITENSIS, new species. 



Plate 49, fig. 5. 



Shell very small, elongate-conic, narrowly umbificated. Tip 

 yellowish-white, base white with a broad median brown band; anter- 

 rior half of aperture white. Surface polished, marked by fine lines of 

 growth only. Suture feebly impressed. Periphery of the last whorl 

 angulated. Base short, well rounded. Aperture broadly oval; 

 posterior angle acute; outer hp thin, curved and slightly patulose; 

 inner lip curved and revolute, almost covering the narrow umbilicus. 



The type and another specimen (Cat. No. 127544, U.S.N.M.) were 

 collected by Mr. Henry Hemphill in shell washings, at San Hipolito 

 Point, Lower California. The type has 10 whorls and measures — 

 length, 3.1 mm.; diameter, 1.2 mm. 



