(l?rom Proceedings of the Academy of Natural Scionccs of Philvula., May, 1863.) 



Contributions towards a Monography of the order of PHOLADACEA, with 

 Descriptions of new Species.— Ho. 2. 



BY GEORGE W. TRYON^ JR. 



Additions to Bibliography. 



Deshayes, G. P. Letter in Zeit. fur Malak. p. 44, March, 1845. 



Dufo, M. H. " Observations sur les mollusques marins, terrestres et fluviatiles 



des lies Sechelles et des Amirantes." Ann. des So. Nat. p 221, 1840. 

 Fischer, P. Note surl'animal du Jouannetia Cumingi, s'uve de la description 



de deux esp^ces nouvelles du meme genre. Journ. de Concliyl. p. 371, 



Oct., 1862. 

 Jonas, J. H. Bemerkungen liber einige der von Lamarck in seiner Hist. Natur. 



des Anim. s. Vertebr. aufgefiihrten Conchylien Arten, mit besonderer 



Riicksicht auf die Zusiitze des Hernn, Deshayes. Zeit. fiir Malak. p. 135, 



Sept., 1844. 



Concbyliologische Notizen. Zeit. fiir Malak. p. 182., Nov., 1845. 

 fStimpson, Wm. On the genus Diplothyra, Am. Jour. Science, p. 445, May, 



1863. 



Descriptions of Species. 



KOCELLARIA DENTIFEUA, Dufo. 



Gastrochxna dentifera^ Dufo. Ann. des So. Nat. p. 221, 1840. 



Shell smooth and very thin, having an apophysis in the anterior part of each 

 valve, and having also in each valve, but at the posterior extremity, a rounded 

 and soldered piece. 



Hab. — Madrepores, Seychelles and Admiral Islands. Very rare. 



Jouannetia Duchassaingi, Deshayes. 



Jouannetia Duchassaingi, Deshayes, Fischer, Journ. Conchyl. p. 375, 1. 15, f, 3, 

 Oct., 1862. 



" Testa globosa, solidissima, alba, valvis antice callo solido, longitudinaliter 

 striate, munitis ; area antica longitudinaliter costata, transversim dense striata; 

 area postica subtile et oblique striata: appendiculo postico valvae dextrse elon- 

 gate, lato, rotundato, intus, IfBvi ; impressionibus muscularibus latis, crassis, 

 lamellas prominentes formantibus. 



Diam. anter. post. 50 mill. 



Alt. 41 " 



Hab. — Panama. (Coll. Deshayes.) 



Obs. — This fine species, -which surpasses in its size the Jouan. pectinata, be- 

 longs to the group of Jouan. Ciiminigi; its specific characters are entirely dif- 

 ferent, so that it is impossible to confound it with that species." 



Jouannetia Vignoni, Fischer. 



Jouannetia Vignoni, Fischer, Journ. de Conchyl. p. 376, t. 15, f. 4, Oct., 1862. 



" Testa rotundato-ovata globosa, solidiuscula, valvis antice callo inflato 

 munitis ; area antica radiatim costata, transversim et valide striata ; area 

 postica late sulcata (in valva dextra,) dense et transversim striata (in valva 

 sinistra;) appendiculo valvae dextrae elongato, rostrato, ad margines serrate; 

 impressionibus muscularibus posticis planis. 



Diam. anter. post. 10 millim. 



Alt. 7 " 



