138 



Mr. Gray on some Species of Shells [Feb. 



C A'RTiiv u semisulcatiim. Testa transversa, ovata lutea rosea 

 vel albida, costato-striata, subspinosa; latere antico conferte 

 striate ; postico producto, aperto, distauter costato ; margiue 

 dentato. long. 7-10 unc. C. bnUato similis. 



Card, crenatnm. Testa cordata, alba, umbonibus carinatis, 

 costis 22 convexis, anticis niinoribus, lunula profundissima 

 callosa intrusa. 



Arca irigona. Testa subcordata trigona turgida, angulata ; 

 latere antico piano, long. 1 unc. peculiar for having the form of 

 Hippopus maculatus. 



NuciiLA Montagui. Arca rostrata, Mont. Sup. t. 27, f. 7. 



Nuc. minuta. Area minuta, Mailer. 



Nuc. tenuis. Arca tenuis, Montague. 



Nac. glacialis. Lenbulus glacialis. Leach. 



Unio ponderosa. Mya crassa, Wood, t. 20, 21. 



Vn. nodulosa. Mya nodulosa. Wood, t. 22, f. 1 — 4. 



Un. plumbea. Chania plumbea, Cheinn. xi. t. 203, f. 1991, 

 1992. N. B. Chama is certainly the best Linnean genus for the 

 freshwater bivalves with irregular teeth. 



H Y K 1 A intermedia. Testa ovato-subquadrata , virido-nigra Isevis, 

 antice rotundata, postice sinuata ; umbonibus prominentibus. 

 long. 26-8 unc. Inter H. aviculareni et H. elongatam. 



Hyria Matoni. Mya variabilis, Maton, Liu. Trans, x. t. 24, 

 f. 417. 



Anodonta must be retained instead o{ Anodon, a change 

 first proposed by Dr. Leach in this work, as the latter has been 

 used for a genus of reptiles. If it must be altered, monodonta, 

 and several others, will also, require it. 



Anodonta Jiuviat His. Mya fluviatihs, Dilhv.3}6, List, t. 157, 

 f. 12. 



Ajiodonta Adansonii. Mytilus dubius, Gmel. Adams, t. 17. 

 f. 18. 



Barbala plicata. Dipsas plicatus, Leach, ZooL Misc. 



