BIVALVE SHELLS. 189 



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

 apice subtruncato. 



Tapes purpurata, Sow.jun. Thes. Conch. p. 692. pl. 150. f, 124, 

 125. 



Hab. India loco Kuracbee dicto. 



II. Species sulcata. 



7. Saxidomus Petiti. 



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

 tenue costata; stria costis interposita, cardine incrassato ; 

 dente mediano bifido, marginibus subcrenatis. 



Venerupis Petiti, Desh. Mag. Guerin, 1841, Moll. pl. 39; Revue 

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



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



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

 Middendorf, Malac. Ross. p. 567. pl. 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, insequilaterali, 

 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 inaequaliter triden- 

 tato, dente medlano bifido ; sinu palliibrevi, lato, semielliptico. 

 Hab. Mare Peruvianum. 



Genus 14. VENERUPIS. 



Animal ovato-transversum, turgidulum vel lateraliter compres- 

 sum ; pallium tenue, antice inferneque apertum, postice clausum 

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

 usque in medio junctae lateraliter compressae; trachea branchiali 

 latiore, in margine tentaculis arborescentibus aliisque simplicibus 

 alternatis coronata ; trachea anali valvula conica terminata et in 

 margine tentaculis brevibus numerosis cylindraceis munita ; ap- 

 pendices labiales parvuljje, triangulares. Pes miuimus, conicus, 

 linguiformis et byssifer. Branchiae inaequales, subquadrangu- 

 lares, postice conjunctae. 



Testa ovato-transversa vel subglobosa, insequilateralis, postice 

 parumper hians. Cardo angustus, tridentatus, in altera valva 



