APPENDIX. | 333 
AMNICOLA LONGINQUA, Gould. 
[ Proceed. Bost. Soc. Nat. Hist., V. 130. Mar. 1855.] 
T. parva, elongato-ovata, levis, apice obtuso, spire anfractibus quinque rotundatis, suturá 
profundä discretis: apertura elliptica, postice rotundata ; columella profundé arcuatá.— Pl. XI, 
figures 10, and 11. 
Shell small, elongate ovate, horn-colored, (or blanched US surface 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 4. Oíncinnatiensis, Haldeman, 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 expanso. Pl. XI, figures 23, 24. 
Shell elongated, turreted, slender, solid, rough, and dusky, composed of ten 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-thirds of a volution distant 
from each other. Aperture small, nearly circular, slightly produced and enor ion at base, very 
dark and glossy liver-brown within; everted. 
Length 12 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 MESA 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 
obliqué volventibus ornata : spira acuta ; anfractibus quatuor rotundatis ; ultimo ad peripheriam 
obtuse angulato et interdum tessellatim fasciato : apertura circularis ; labro tenui, albo; 
columella albá, compressa ; faucibus callo albo incrassatis. ‘Pl. XI, figs. 25, 26. 
Shell small, solid, ovate, imperforate, smooth and shining, ashy 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 
