182 



November 18, 1846. 



Dr. C. T. Jackson, Vice President, in the Chair. 



Dr. Gould continued his descriptions of Shells collected 

 by the U. S. Exploring Expedition. 



SucciNEA ROTUNDATA. Testa parva, tenera, sub-opaca, hemi- 

 spherica, flavo-virens, concinne striata : spira fere nulla, intus 

 aperta, anfr. 2^, ultimo amplissimo : apertura circularis, postice 

 angulata, testam fere adequans ; margiiie columellari obliquo, 

 subrecto, conspicue plicato, et callo lato induto. Long, y^g-, lat. J-^y 

 alt. 20" poll. Hah. Mountains of Oahu, Sandwich Islands. 



This, with the two following species, are remarkable for their 

 hemispherical form and large apertures, with the animal much 

 too large for the shell, and belong to Helicolimax, Fer. Resem- 

 bles S. aperta, Lea. 



SucciNEA CEPULLA. Testa parva, tenuissima, pellucida, nitida 

 succineo-virens, rotundato-elliptica, depressa, sinistrorsum rotun 

 data, dextrorsum declivis, longitudinaliter striata et liris inequalr 

 bus volventibus arata : spira fere nulla, anfr. 2J- : apertura am 

 plissima, ovalis, ad basim late rotundata, ad columellam arcuata 

 leviter plicata ; intus metalUca. Long. |-, lat. ^ij, alt. -^ poll 

 Hah. Hawaii. 



Depressed and without spire like the preceding, but is larger, 

 more transparent, less spherical, has spiral furrows, and the 

 aperture is peculiarly widened posteriorly by an outward sweep 

 of the lip. 



SucciNEA PUTAMEN. Tcsta magna, depressa, globoso-elliptica, 

 tenuis, Isevis, striis incrementalibus et striis volventibus lenuiter 

 decussata, fulvo-cornea, ad peripheriam sub-angulata : spira fere 

 nulla, anfr. vix 2 : sutura linearis : apertura paginam inferiorem 

 fere adequans, rotundato-ovalis ; margine columellari sub-plicato. 

 Long, -g-, lat. ^ poll. Hah. Upolu. 



A remarkable shell, resembling the half of a bird's egg. Dis- 

 tinguished from S. rotundata by its larger size, revolving striae^ 

 and angular periphery. 



