APPENDIX. 333 



AMNICOLA LONGINQUA, Gould. 

 [ Proceed. Bost. Soc. Nat. Hist. , V. 130. Mar. 1855.] 



T. parva, elongato-ovata, Izevis, apice obtuso, spirae anfractibus quinque rotundatis, sutura 

 profunda discretis : apertura elliptica, postice rotundata ; columella profunde arcuata. PL XI, 

 figures 10, and 11. 



Shell small, elongate ovate, horn-colored, (or blanched chalky-white,) surface t quite smooth; 

 apex obtuse, whorls five, well-rounded and separated by a deep suture. Aperture elliptical, 

 broadly rounded posteriorly ; lip simple, copiously incrusting the pillar margin, which is pro- 

 foundly arcuate ; umbilical region nearly perforate. 



Length one-eighth of an inch, breadth one-tenth of an inch. 



Found in the Colorado Desert. 



In form it is much like A, Cincinnatiensis, Haldeinan, or like his A. galbana. 



II. MARINE SHELLS FROM THE COAST. 



POTAMIS PULLATUS, Gould. 

 [Appendix to Prelim. Geol. Report of W. P. Blake, 1855.] 



Testa turrita, gracilis, solida, rudis, fusco-cinerea ; anfractibus ad decem convexiusculis, plicis 

 circiter decem convexiusculis arcuatis compressis instructis, et filis ad quinque volventibus cinctis; 

 tribus ultimis varice munitis : apertura parva, subcircularis, nitide rufo-nigra ; basi vix effuso 

 et contorto ; labro expanse. PL XI, figures 23, 24. 



Shell elongated, turreted, slender, solid, rough, and dusky, composed often closely revolving 

 moderately convex whorls, ornamented with about 16 longitudinal, curved, compressed folds, 

 and about five revolving threads, which usually form beads where they crown the folds ; the 

 three anterior whorls are fortified with, a strong varix, about two L thirds of a volution distant 

 from each other. Aperture small, nearly circular, slightly produced and contorted at base, very 

 dark and glossy liver-brown within ; everted. 



Length 1|- inch, breadth two-fifths of an inch. 



Locality. Brought from San Diego by Dr. Tho. H. Webb and Wm. P. Blake. 



This shell is apparently very common, and yet I find no description answering to it. From 

 P. sacratum, Gould, it may be distinguished by its small and dark-colored aperture, and the 

 longitudinal folds. It is much like P. iostoma, Pfeiffer, a Cuban species. Some of the speci- 

 mens are very much more slender than others. 



PHASIANELLA COMPTA, Gould. 

 [Preliminary Report, 1855.] 



Testa parva, solida, ovato-conica, imperforata, polita, cinerascens, lineis olivaceis tenuissimis 

 oblique volventibus ornata : spira acuta ; anfractibus quatuor rotundatis ; ultimo ad peripheriam 

 obtuse angulato et interdum tessellatim fasciato : apertura circularis ; labro tenui, albo ; 

 columella alba, compressa ; faucibus callo albo incrassatis. PL XI, figs. 25, 2(>. 



Shell small, solid, ovate, imperfbrate, smooth and shining, a&hy white, minutely and closely 

 lineated in an obliquely spiral manner with olive green. Whorls four, well rounded, forming 

 an acute spire, the outer one obtusely angular at periphery, where there is sometimes a delicate 

 range of catenated white and olive spots ; aperture nearly circular ; lip very thin, showing the 



