(From Proceedings of the Academy of Natural Sciences of Philada., May, 1803.) 



Contributions towards a Monograph? of the order of FHOLADACEA, 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 iles Sechelles et des Amirantes." Ann. des Sc. Nat. p. 221, 1840. 

 Fischer, P. Note surl'animal du Jouannetia Cumingi, s^ive 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 Arten, mit besonderer 



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



Sept., 1844. 



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

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



1863. 



Descriptions of Species. 



KOCELLARIA DKNTIFEEA, 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. 



Hob. Madrepores, Seychelles and Admiral Islands. Yery rare. 



JOUANNETIA DUCHASSAINGI, DeshayCS. 



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

 Oct., 1862. 



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

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

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

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

 lamellas prominentes formantibus. 



Diam. ant6r. post. 50 mill. 



Alt. 41 " 



Hob. Panama. (Coll. Deshayes.) 



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

 longs to the group of Joiian. 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. 



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

 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 elongate, rostrato, ad margines serrato ; 

 impressionibus muscularibus posticis planis. 



Diam. anter. post. 10 millim. 



Alt. 7 " 



