■Boston Society of Natural History. 385 



as Amphidesma corhidoides , Lam. ; but the European shell is twice the 

 size, more elongated, more broadly truncated, more inequilateral, thicker, 

 and covered with a much stronger and more opaque epidermis. Dr. 

 Gould noticed the peculiarity of the ossiculum several years since, and 

 consequently referred the shell to the genus Lyonsia. 



Mr. CouTHOuY, also read the description of a new species of £oZzs 

 lately found by him, and which he named 



EoLis DivERSA. E. corpore limaciformi, postice acuto, diaphano, lu- 

 teo-rufescente, capite distincto, suh-orbiculato, depresso; tentaculis 

 gracilibus elongatis duabus instructo, duabusque brevioribus ad par- 

 tem posticam capitis positis; branchiae aurantiacse seriebus binis la- 

 teribus dorsi dispositis. Orificia generationis magna, juxta collum 

 ad latus dextrum, ano paullum pone; pede supra laciniato. Length 

 f^, breadth 2T of ^11 inch. Inhabits Massachusetts Bay, Chelsea 

 Beach. 

 Found among the roots of Laminaria sacchnrina. Tn its color and 

 general aspect it resembles E. salmonacea, Nobis, but differs in the form 

 and position of the tentacula and genitalia. In E. solmonncea the lateral 

 tentacula seem to be a prolongntion of the fleshy lips, instead of being 

 placed near the neck ; the superior ones are long, somewhat compressed, 

 and as it were serrated at the edges, while in E. diversa they are short, 

 smooth and round. 



Dr. Jeffries Wyman, reported upon a collection of fossil hones from 

 the Brunswick canal, Georgia, presented by Mr. Cooper. It consisted of 

 eighteen bones belonging to the genera Bos, Elephas, and probably Mas- 

 todon. Among them were the atlas of a ruminant, of gigantic size; me- 

 tatarsal bone of right foot of genus Bos, about twice the size of the cor- 

 responding bone of the common ox which he exhibited by its side, and 

 similar to it in every particular ; several vertetrrce of k Mastodon ; portions 

 of a tu^k and teeth of an Elephant. These teeth resemble those of an In- 

 dian elephant, but the layers of enamel are more numerous and closer. 

 An OS calris having the hinder portion broken off, but which is now longer 

 than that of our elephant, though not so massive. 



Dr. W. had also examined son)e fossil hones brought from Bnrmah by 

 Rev. H. Malcom. They consist of a portion of the brim of the pelvis, 

 probably of a 3Iast(rdon ; tooth exhibiting the longitudinal crescentic lay- 

 ers characteristic of a ruminant, and corresponding with a figure by Mr. 

 Clilt in the Trans, of the Geol. Society, vol. vii, of the tooth of a deer from 

 the same locality; vertebra of a Saurian, also resembling a figure by Mr. 

 Clift, and which he regards as the vertebra of a crocodile, with all proba- 

 bility of truth. This locality on the river Irawaddy, below Ava, is the 

 only locality known where the bones of mammalia and saurians are found 

 associated. 

 Vol. XXXVI, No. 2.— April-July, 1839. 49 



