200 



Messrs. Horace Gray, Jr. and Charles C. Sheafe were 

 elected members of the Society. 



Dr. William Henry Thayer was nominated as a member 

 of the Society, by Dr. Bacon. 



January 20, 1847. 



Dr. Storer, Vice President, in the Chair. 



Dr. Gould gave descriptions of the following Expedition 

 Shells of the genera Achatinella and Helicina. 



AcHATiNELLA MARMORATA. Testa oblongo-ovata, coloribus 

 castaneis, cinereis, et albidis marmorata, leviter striata, imperfo- 

 rata : spira acuta, anfr. 6 convexis, superne sub-tabulatis, ultimo 

 magno, ventricoso: apertura ovata ; peristomate simplici, mo- 

 dice evaso ; plica columellari alba, compressa, fere transversa, 

 vaide exstante. Long. |, lat. ^ poll. Hob. Haleakala Moun- 

 tains, Maui, Sandwich Islands. 



A large ventricose species, readily distinguished by its varie- 

 gated coloring. 



Achatinella ellipsoidea. Testa solida, ellipsoidea, Isevis, 

 epidermide luteo interdum fusco zonato induta : spira anfr. 6, 

 convexiusculis ; sutura impressa : apertura parva, angusta ; 

 peristomate acuto, nigro; plica columellari fere transversa, tenui. 

 Lat. /^, alt. -j^o poll. Hah. Maui. 



Closely allied to A. microsfovia, which has a thickened lip, 

 and a more dead, striated surface. 



Achatinella acuminata. Testa parva, elongata, turrita, lu- 

 cida, glaberrima, nitida, succinea ; spira elevala, anfr. 6 obliquis, 

 convexiusculis, ultimo trientes duo longitudinis equante : aper- 

 tura angusta, sub-elliptica, peristomate albido, incrassato, prorsum 

 arcuato ; columella truncata, sed vix plicata. Long. ^^, lat. ^ 

 poll. Hab. Kauai, Sandwich Islands. 



More elongated, and with more oblique whorls than other spe- 

 cies. In its form, color and clearness, it may be compared with 

 Fhysa hypnorum. 



