ON MOLLUSCA OT THE WEST COAST OF NORTH AMERICA. 



637 



H. Zirplisea crispata 



12. Pholadidea penita 



13. ovoidea 



14. Netastoma Darwinii . 



15. Martesia intercalata . . . 



16. Parapholas Califomica. 



17. Saxicava plioladia 



18. Glycimeris generosa . . . 



19. Mya truncata 



20. Platyodon cancellatus . 



21. Cryptomya Califomica 



22. Schi?othsenis Nuttalli . 



23. Darina declivis 



24. Corbula luteola 



25. SphBenia OToidea 



26. Nesera pectinata 



B 



Jew. B.A. 



M 



C 

 D 



M 



C 



CL 

 P 

 P 







c 







Smiths. Ins. 



VOFBEB 

 H 



MCH 

 PF 



FD 

 F 



OFM 



?V 

 V 



Cooper. 



Dfr. 

 MD 



M 







D 

 D 

 D 



FDI 

 D 

 D 



D 



BI 



Family Pholadidee. 



11. Zirphcea crispata, Linn, aiict. E. & W. Atlantic and circumpolar. 



12. Pholadidea penita, Conr. Hani. auct. = concameruifa, Desk. Shape from elongate 



to ovoid ; umbonal reflexion closely adherent. 



1 3. Pholadidea ovoidcn, Grid. Otia. Umbonal reflexion TvJtli anterior opening. 



14. Netastoma Darwinii. Sby. New subgenus : yalves prolonged, like duck's bill 



instead of cups. Surface with concentric fiills. Quoted from " S. A." 



15. Martesia intercalata, Cpr. Maz. Cat. no. 19. From Southern fauna. 



16. Parapholas Calif ornica, Conr. Hani. auct. = P. Janellii, Desh. Very large; 



with layers of thin, short cups. 



Family' Saxicavidts, 



17. Saxicava pholadis, Linn, auct.+var. arctica, Linn. auct. Maz. Cat. no. 23+var. 



gastrochamaidea, ovoid and gaping like Maz. Cat. no. 21+var. legumen, Desh., 

 elongate,' cylindrical, scarcely gaping. 



18. Glycimeris generosa, Gld. E.E. Perhaps = Pa»qp«a Faigasii, S.Wood, Crag 



Moll. -. pipes like Saxicava. 



circumpolar. 



Low water : common. 



Family Myadce. 



19. Mya truncata, Linn. auct. = M. prcscisa, Gld. Atlantic : 



20. Platyodon cancellatus, Conr. Hani. Pipe-ends 4-valved. 



Sold in S. Francisco market, Cp. 



21. Cryptomya Califomica, Conr. Outside like young Jffi/«; mantle-bend nearly 



obsolete. 



Subfamily iMtrarince. 



22. Schizothterus Nuttalli, Conr.-\- Tresus maximus, Midd. Gray=X. capax, Gld. 



Shape from ovoid to elongate ; veiy large and tumid ; besis swollen ; hinge- 

 sides channeled ; mantle-bend joined to ventral line. 



23. Darina declivis, n. s. Outside like Machanra. Cartilage-pits produced, gaping. 



Family Cm-hulidee. 



24. Corhula Iwteoln, n. s. Shape of young biradiata ; small, ashy yellow. Com. Cp, 



25. Sphcemia ovoidea, n. s. Siphonal area small ; front excuiTed ; mantle-bend large. 



26. Necera pectinata, n. s. Principal ribs about 12: beak smooth. Like sulcata. 



40-60 fm. Cp. 



123 



