116 NEW UNIONID^, MELANID^, ETC., 



cate, smooth ; spire obtuse, reddish at the tip ; sutures much impressed ; whorls six, 

 convex, the last one very large ; aperture large, nearly round, within white ; colu- 

 mella white, thick, incurved. 



Proc. Acad. Nat. Sci., 1856, p. 109. 



Hab.—Siam, S. R. House, M. D. 



My cabinet and pabinet of Mr. Haines. 

 Diam. -88, Length 1-27 inch. 



RemarTcs. — This is a remarkably solid globose species. The color is paler than 

 usual with the Paludince, the darkest being of an apple green, others varying 

 and passing into a pale whitish green. The oldest specimens have dark oblique 

 strige, somewhat like P. ohtusa Trosch., as figured by Philippi, v. 3, pi. 1, f. 14, but 

 it is a larger species and more globose than that. The ujjper portion of the whorls 

 is slightly flattened, and the upper part of the columella is thickened. In mature 

 specimens the aperture is bordered by a linear black edge. This species nearly 

 answers to the description of crassa Benson, (Journ. Asiatic Soc, v. 5,) but differs in 

 several respects. 



I dedicate this fine species to W. A. Haines, Esq., to whom I am indebted for so 

 many fine Siamese fresh water shells. 



■ Paludina Swainsoniaka. pi. 22, fig. 7. 



Testa globosa, subsolida, tenebroso-viridi, arctissime umbilicata, lasvi; spira obtusa; suturis valde irapressis; 

 anfractibus instar quinis, convexis; apertura rotundata, intus albida. 



Shell globose, rather solid, dark green, narrowly umbilicate, smooth ; spire obtuse ; 

 sutures A^ery much impressed ; whorls about five, convex ; aperture rounded, within 



white. 



Proc. Acad. Nat. Sci., 1856, p. 110. 



Sa6.— Siam, T. R. Ingalls, M. D. 



My cabinet and cabinet of Dr. Ingalls. 

 Diam. -Sd, Length 1'15 inch. 



Remarlcs. — Three specimens were submitted to me by Dr. Ingalls under the name 

 of unicolor Swainson, and I think this is the species figured by that Zoologist in 

 Zool. Journ., 1st ser. v. 2, pi. 98, as unicolor ; but it is not the same shell described by 

 Olivier as Cyclostoma unicolor, coming from Egypt, and which Lamarck has recognized 

 in his Anim. Sans. Vert., Pcd. unicolor, v. 6, p. 174. I therefore propose Mr. Swain- 

 son's name for the species. It does not seem to have been noticed by Philippi. It is 

 near to ohtusa Trosch. andi01ainesiana, herein described, but it is not so thick as either 

 of those species, is without the bands and is of a darker green. The half grown 

 specimens are of a lighter green and the apex is brownish. 



