BIVALVE SHELLS. 189 



mediano in sinistra ; sinu pallii elongato, trigono, basi lato, 

 apice subtruncato. 



Tapes puipurata, Sow.jun. Thes. Conch, p. 692. pi. 150. f. 124. 

 125. 11' 



Hab. India loco Kurachee dicto. 



II. Species sulcatoB. 



7. Saxidomus Petiti. 



S. testa ovato-globosa, cordiforrai, albo-grisea, longitudinaliter 

 tenue eostata ; stria costis interposita, cardine incrassato ; 

 dente mediano bifido, raarginibus subcrenatis. 



Venerupis Petiti, Desk. Mag. Guerin, 1841, Moll. pi. 39; Revue 

 Zool. Soc. Cuv. 1839, p. 359. 



Grewingk, Verh. Kais. Russ. Min. Gesells. Petersb. 1848- 



1849, p. 351.pl. 5. f. 2, &c. 

 Middmdorf, Malac. Ross. p. 567. pi. 17. f. 11-13. 

 Tapes diversa, Sow. jun. Thes. Conch, p. 



Hab. California. 



8. Saxidomus decussatus, Desh. B.M. 



S. testa ovata, transversa, turgida, subcordiformi, inaequilaterali, 

 squalide grisea, sulcis longitudinalibus transversisque minutis, 

 regulariter decussato-granosa ; sulcis transversis in fornice et 

 in medio evanescentibus ; lunula vix perspicua, excavata, 

 striata ; valvis intus albo-griseis ; cardine insequaliter triden- 

 tato, dente mediano bifido ; sinu pallii brevi, lato, semielliptico. 



Hab. Mare Peruvianum. 



Genus 14. VENERUPIS. 



Animal ovato-transversum, turgidulum vel lateraliter eompres- 

 sum ; pallium tenue, antice inferneque apertum, postice clausum 

 longitudinis in tertia parte ; tracheae longae, inaequales, a basi 

 usque in medio junctie lateraliter comj)ressse ; trachea branchiali 

 latiore, in margine tentaculis arborescentibus aliisque simplicibus 

 alternatis corouata ; trachea anali valvula conica terminata et in 

 margine tentaculis lirevibus numerosis cylindraceis munita ; ap- 

 pendices labiales i)arvul8e, triangulares. Pes minimus, conicus, 

 linguiformis et byssifer. Branchiae inaequales, subquadrangu- 

 lares, postice conjunctae. 



Testa ovato-transversa vel subglobosa, inaequilateralis, postice 

 parumper hians. Cardo angustus, tridentatus, in altera valva 



