215 



slriis subtilissimis decussata : spira anfr. 4-5 ventricosis ; suturi 

 per-profunda : apertura obovata, dimidiam testae longiiudinis vix 

 superans; columella rufa, valde plicaia. Long, f^jj, lat. /^j poll. ; 

 of another, long. ^, lat. ^ poll. Hah. Sandwich Islands. 



Remarkable for its general color, the color of the pillar lip, its 

 decussated surface, and its very tumid whorls. Its form is so 

 much like that of a reversed Limnea, that I am strongly inclined 

 to believe it to be one. Probably the Limnea Oahucnsis, Sou- 

 leyet, (Voy. de la Bonite,) is the same ; but unfortunately the 

 animal there given is so indefinitely figured as to leave it doubt- 

 ful whether it is really a Limnea or a Physa. 



Physa virginea. Testa elongato-ovata, tenuis, fragilis, lucida, 

 nitida, alba : spira acuta, anfr. 5 convexis, postice subangulatis : 

 apertura elongata, obovata, postice acuta; columella leviter pli- 

 cata. Long, f, lat. -f'g- poll. Hah. Rio Sacramento, California. 



The porcelain-like structure and color of the specimens seems 

 not to be merely the effect of bleaching. It is one of the most 

 elongated species, but less slender than P. hypnorum and more 

 like P. gyrina or P. ricalis in form, but is a far more delicate 

 shell. 



Physa venustula. Testa parva, ovata, pellucida, nitida, di- 

 lute cornea: spira elevata, anfr. 5 ventricosis, postice subangu- 

 latis: apertura ovata; columella valida, albida, valde sinuata. 

 Long. y3(y, lat. -^ poll. Hah. Lima. 



Closely resembles small specimens of P. heierostropha, though 

 in size and texture it is like P. fontinalis, which has a much 

 shorter spire. 



Messrs. Edward Phillips and Marshall P. Wilder were 

 elected members of the Society. 



ADDITIONS TO THE LIBRARY. 



Audubon and Bachman. Quadrupeds of North America. 

 Plates, 101-105. Folio. Suhscrihers. 



S. G. Morton. Hybridity in Animals and Plants. 8vo. pam. 

 New Haven, 1847. Author. 



Transactions of Massachusetts Horticultural Society, for 

 1843-6. 8vo. pam. Boston. The Society. 



