188 BIVALVE SHELLS. 



viore rotundato, angustato, concentrice ruguloso ; latere anali 

 truncato; labris integris; ligamento permagno {Sow.), 



Venus opaca, Sow. Proc. Zool. Soc. 1835, p. 42. 



D'Orb. Pal. Amer. 31erid. p. 160; Voy. en Amer.Moll.it. 560. 



Wood, Ind. Test. Suppl. pl. 15. f. 54. 



Hanley, Descr. Cat. p. 128. 

 V. expallescens, Phil. Ahhild. Conch. pl. 3. f. 5. 

 Tapes opaca, Sow. Thes. Conch. p. 691. pl. 150. f. 123. 

 Venus litlioida, Jonas, Moll. Beitr. p. 14. pl. 8. f. 6. 



Phil. Abhild. Conch. ii. pl, 4. f. 1. 



Hab. Mare Chilense. 



4. Saxidomus Nuttalli. B.M. 



5. testa ovato-transversa, subaequilaterali, tiunida, crassa, solida, 

 extremitatibus obtusa, anguste hiante ; umbouibus tumidis, 

 approximatis, oppositis, rugis transversis insequalibus, postice 

 crassioribus ; valvis extus colore lapideo squalide flavis, intus 

 albis vel pallide luteis, postice ad marginem violaceis; sinu 

 pallii lato, profundoque, horizontali, lateribus parallelis. 



Saxidomus NuttalH, Conrad, Journ. Ac. Nat. Sci. Phil. 1837. 

 Hanley, in Wood, Suppl. pl. 16. f. 16? (non Conrad). 



Hab. California. 



5. Saxidomus squalidus. B.M. 



5. testa ovata, transversa, tumida, insequilaterali, antice obtusa, 

 postice latiore obtuse truncata, irregulariter transversim sub- 

 striata, squalide flavo-grisea, lunula areaque nullis ; umbonibus 

 parvis, oppositis, approximatis ; valvis intus albis ; cardine 

 subquadridentato, sinu pallii profundissimo, basi lato, apice 

 obtusissimo. 



Tapes lithoida, Sow. jun. (non Jonas) Thes. Conch. p. 692. 



pl. 150. f. 126. 

 Junior. Venus expallescens, Phil. Ahbild. Conch. i. pl. 3. f. 5. 

 Sow.jun. Thes. Conch. p. /44. pl. 163. f. 161, 162. 



Hab. Prope Copiapo Chihensem. 



6. Saxidomus purpuratus. 



S. testa ovali, subcompressa, albo-grisea, intus purpurea, irregu- 

 lariter et subundulatim concentrice rugata ; latere postico lon- 

 giore, obtuse subtruncato ; latere antico brevi rotundato ; den- 

 tibus cardinalibus insequaUbus, majore postico in valva dextra, 



