NATURAL SCIENCES OP PHILADELPHIA. 143 



Contributions towards a Monography of the order of PHOLADACEA, with 

 Descriptions of new Species. No. 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 iles Sechelles et des Amirantes." Ann. des Sc. Nat. p 221, 1840. 

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



de deux especes nouvelles du meme genre. Journ. de Conchyl. p. 371, 



Oct., 1862. 

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



des Anim. s. Veitebr. aufgefiihrten Conchylien ArteD, mit besonderer 



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



Sept., 1844. 



Conchyliologisehe Notizen. Zeit. fur Malak. p. 182., Nov., 1845. 

 Stimpson, Win. On the genus Diplotbyra, Am. Jour. Science, p. 445, May, 



1863. 



Descriptions of Species. 



ROCELLARIA DENTIFERA, Dufo. 



Gastrochxna dentifera, Dufo. Ann. des Sc. 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, t. 15, f, 3, 

 Oct., 1862. 



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

 striato, munitis ; area antica longitudinaliter costata. transversim dense striata; 

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

 gato, lato, rotundato, intus, laevi ; impressionibus muscularibus latis, crassis, 

 lamellas promimentes formantibus. 



Diam. anter. post. 50 mill. 



All. 41 " 



Hab. Panama. (Coll. Deshayes.) 



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

 longs to the group of Jouan. Cuminigi; 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. 



11 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 serrato ; 

 impressionibus muscularibus posticis planis. 



Diam. anter. post. 10 millim. 



Alt. 7 " 



Hab. West Coast of Africa. (Captain Vignon.) 



Obs. This curious species approaches to the group of J. globosa and pec- 

 tinata. It is remarkable for the development of the posterior appendage of 

 the left valve, the inflation of the callous portion, &c. 



1863.] 



