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Art. VII. — Descriptions of Exotic Unionidce. 

 By Isaac Lea, LL. D. 



In my last two papers, published in the Journal of the Academy, there were 

 described at length and figured eighty-two indigenous species of this family, many 

 with the soft parts and embryonic forms. In the paper previous to the two above 

 mentioned, I described thirty-three exotic species. In the present paper, which I offer 

 to the Academy, I return to the exotic forms, which have, through the kindness of 

 many obliging friends, increased upon my hands during the last two or three years. 

 It will be observed that I have added some full descriptions of a few species from the 

 Philippine Islands, long since temporarily described in the Proceedings of the 

 Zoological Society of London. These are now for the first time described at length 

 and illustrated, careful drawings having been made from good specimens since kindly 

 sent to me by H. Cuming, Esq., who collected them during his dangerous voyage 

 among those islands investigating their natural history. 



This paper will probably be followed by another, about the same size, perhaps larger, 

 now nearly ready, on the indigenous species again, which have accumulated on my 

 hands for some time. The interest taken in the development of the family Unionidce 

 by numerous kind friends in Georgia, Alabama, Mississippi and North Carolina, who 

 study this branch of natural history, has been most untiring, and I renew here the 

 expression of my great obligations to them, in which, I feel assured, all malacologists 

 will join me. It will be observed that I have done nothing more than justice in 

 mentioning, in the description of each of the species, the source from whence they 

 were obtained, the names being appended to each. 



MONOCONDYLGEA CUMINGII. PL 33, fig.. 114. 



Testa lsevi, obovata, compressa, inEequilaterali, postice subbiangulata ; valvulis subcrassis ; natibus vix 

 prominentibus ; epidermide atro-fusca; deutibus cardinalibus lobatis, in utroque valvulo unicisj 

 niargarita alba et iridescente. 



Shell smooth, obovate, compressed, inequilateral, subbiangular behind; valves 

 somewhat thick ; beaks scarcely prominent ; epidermis blackish brown ; cardinal 

 teeth lobed and single in both valves; nacre white and iridescent. 



Anodonta Cumingii, Lea. Proc. Zool. Soc, Lond., 1850, p. 199. 



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