ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 637 
Nutt.| Jew. | B. A. ||Smiths. Ins.) Ken. | Lord.|Swan.| Cooper, 
11. Zirpheea crispata ........ —|—|— — Bee pew pe 
12. Pholadidea penita ...... | B | B} C | VOFMB| P | —| V MD 
15. PROVED. |e. ace « —|D|D i —|;—|— M 
14. Netastoma Darwinii ....| —|— | M — —; Vi — C 
15, Martesia intercalata ...... —}—|— I —|}—|— — 
16. Parapholas Californica....| B | — | C -- — — D 
17. Saxicava pholadis........ —j|M/|CIL| MCH | P| V| V D 
18. Glycimeris generosa...... ;—j|—|P PF —\|—|— D 
WD, ‘Mya truncata.........0.5. |; —}|—|P — P | —|— — 
20. Platyodon cancellatus ....) B | — | C FD | —|—j|—J| FDI 
21. Cryptomya Californica ..| B | B | C F P|—|V D 
22. Schizotherus Nuttalli....| — | B | C OFM |} P|}—!|Vj| OD 
23. Darina declivis .......... ;—|—]— — —|V|— _ 
24, Corbula Iuteola.......... —|—;}—] — —|— D 
25. Spheenia OyOWded=.5 06 hs —|— — P| — — 
26. Nevera pectinata .,...... — ha P|}—|— BI 
Family Pholadide. 
. Zirphea erispata, Linn. auct. E. & W. Atlantic and circumpolar. 
. Pholadidea penita, Cony. Hanl. auct.=concamerata, Desh. Shape from elongate 
to ovoid; umbonal reflexion closely adherent. 
. Pholadidea ovoidea, Gld. Otia. Umbonal reflexion with anterior opening. 
. Netastoma Darwinti, Shy. New subgenus: valves prolonged, like duck’s bill 
instead of cups. Surface with concentric frills. Quoted from “8, A.” 
~ Martesia intercalata, Cpr. Maz. Cat. no. 19. From Southern fauna. 
. Parapholas Californica, Cony. Hanl. auct.=P. Janell, Desh. Very large; 
with layers of thin, short cups. 
Family Saricavide. 
Sazicava pholadis, Linn. auct.+-var. arctica, Linn. auct. Maz. Cat. no. 23-+-var. 
gastrochenoidea, ovoid and gaping like Maz. Cat. no. 21+-var. legumen, Desh., 
elongate, cylindrical, scarcely gaping. 
. Glycimeris generosa, Gld. K.E. Perhaps= Panopea Fayjasti, 8. Wood, Crag 
Moll. : pipes like Saxicava. 
Family Myade, 
. Mya truncata, Linn. auct.= MW, precisa, Gld. Atlantic: circumpolar. 
. Platyodon cancellatus, Conr. Hanl. Pipe-ends 4-valyed. Low water: common. 
Sold in §. Francisco market, Cp. 
. Cryptomya Californica, Cony. Outside like young Mya; mantle-bend nearly 
obsolete. 
Subfamily Latrarine, 
. Schizotherus Nuttalli, Conr.+Tresus maximus, Midd. Gray=LZ. capax, Gd. 
Shape from ovoid to elongate ; very large and tumid; beaks swollen ; hinge- 
sides channeled ; mantle-bend joined to ventral line. 
Darina declivis, n.s. Outside like Machera. Cartilage-pits produced, gaping. 
Family Corbulide. 
. Corbula luteola,n.s, Shape of young biradiata; small, ashy yellow. Com. Cp. 
» Sphenia ovordea,n.s. Siphonal area small ; front excurved ; mantle-bend large. 
. Neera pectinata, n,s. Principal ribs about 12; beak smooth. Like sulcata, 
fm. Cp, 
