177 



October 21, 1846. 

 Dr. J. B. S. Jackson in the Chair. 



The Chairman read a letter from the Secretary of the 

 Massachusetts Historical Society, communicating a vote, 

 that a collection of Plants belonging to that Society be pre- 

 sented to the Boston Society of Natural History, on certain 

 conditions. It was voted, that the Curator of Botany be 

 requested to confer with the officers of the Massachusetts 

 Historical Society, to receive the plants, and give the requi- 

 site receipts. 



Dr. Gould communicated the following descriptions of 

 the Shells of the Exploring Expedition. 



Helix eurydice. Testa tenuis, depresso-pyramidata, acutis- 

 sime carinata, pallide virens, linea castanea volvente supra et 

 infra picta, subtus planulata, umbilico lato et profundo perforata : 

 spira anfr. 5-6 vix convexis, apice rotundato : apertura trans- 

 versa, acute triangularis ; labro acuto. Lat. J-f, alt. H- poll. 

 Hah. Tongataboo. 



Approaches H. Cressida, but is much thinner, nearly trans- 

 parent, of a much smoother texture at surface, flatter beneath, 

 and the coloring seems to be very uniform. The color of the 

 animal is also different. Its shape is almost precisely that of 

 H. elegans, though much larger. It is also like H. planorboides, 

 Lesson, (H. solarium, Quoy), which is very much smaller and 

 destitute of fillets. 



Helix subtilissima. T. minuta, fragilissima, nitidissima, 

 lenticularis, plano-convexa, imperforata : spira planulata, anfr. 5 



planis, arete volutis ; ultimo acutissime carinato : apertura 



(fracta). Lat. |^, alt. -j^^ poll. Hab. Maui, Sandwich Islands. 



This little pellucid shell, though imperfect, is so well marked 

 by its compressed lenticular form, sharp carination and numerous 

 whorls, that I venture to pronounce it a new species. 



proceedings B. S. N. H. 17 NOVEMBER, 1S46. 



