128 



peripheriam obtuse carinata, late umbilicata, supra infumata et 

 rugis minutis obliquis asperata, infra nigerrima, nitida et minutis- 

 sime granulata ; anfr. 6^ convexiusculis : apertura rhomboidea ; 

 labro rufo, basi reflexiusculo ; fauce sericea, lilacina, prope la- 

 brum fuscescente. Diatn. 1^; axis ^ poll. Brought frojn San 

 Francisco by Dr. Bigelow. 



Has about tlie form and color of H. plicata, Born, without its 

 complicated aperture. It might at first be mistaken for H. Nut- 

 tallii, Lea, but is distinguished by its lenticular form, smoky 

 black color, and its peculiar rasp-like and granulated surface. 



PiiYSA BULLATA. Testa magna, ovato-ventricosa, tenuis, fra- 

 gilis, lucida, cornea : spira elevata, acuta; anfr. 6, ultimo inflato; 

 sutura bene impressa : apertura late ovata, f long, testes ade- 

 quans ; labro tenui, rufo submarginato ; columella valde flexu- 

 osa, callo induta. Long. 1 poll. ; lat. ^§ ad ^^ poll. Found in 

 Oregon, by Dr. J. G. Cooper. 



Distinguished by its large size, inflated form, and delicate 

 structure ; sometimes the form Is somewhat cylindrical. It 

 accords most nearly with Haldeman's pi. 3, fig. 9, which was 

 given him as P. Sayi, Tappan. It is much more delicate, and 

 less polished than P. heterostrojjJia, Say, and the aperture is 

 less elongated. 



Physa humerosa. Testa subrhomboidea, solidula, polita, 

 albida : spira acuta ; anfrac. 5 tabulatis : apertura 4 ad | long, 

 testa; adequans, postice rotundata ; labro expanse ; columella vix 

 plicata, callosa, fere perforata. Long. ^ ad -/g- poll. ; lat. f poll. 

 Found by Dr. Thomas H. Webb, and by W. P. Blake, in the 

 Colorado Desert and at Pecos River. 



The broadly tabulated whorls, with the acute, elevated spire, 

 and foldless pillar clearly distinguish this species. It is like 

 P. tahulata^ Gould, and the variety figured by Haldeman, as 

 P. ancillaria, (fig. 7,) which he regards as a monstrosity ; the 

 deep suture and simple columella distinguish it from that species. 



Physa virgata. Testa modica, solidula, glabra, elongato- 

 ovata, cinerea olivaceo longitudinaliler virgata : spira elevata, 

 acuta ; anfrac. 4-5 bene discretis : apertura lunata, f longitud. 



