
97 
Aocpediva Masgasell cumingi, Davidson. 43 
erebratella(?) cumingii, Davidson, Ann. and Mag., Nat. 
Hist. 1852, 2nd ser., vol. ix., p. 8368, and Proc. Zool. Soc., Lond., 
1852, p. 78, pl. xiv., figs. 10-16. 
Terebratula (Bouchardia) cumingii, Reeve, Conch. Icon., 
1861, pl. viii., fig. 30. 
Magasella cumingii, Davidson, ‘‘Challenger’’ Rep. Zool., 
vol. i., 1880, p. 48. 
M. cumingi, Davidson, Proc. Zool. Soc., Lond., 1886, p. 97, 
sp. 54, pl. xvil., figs. 23-32. 
Magas cumingi, Davidson, Augas, Proc. Zool. Soc., Lond., 
1867, p. 935, ‘‘deep water outside Port Jackson Heads.’’ 
Terebratula (Bouchardia) fibula, Reeve, Conch. Icon., 1861, 
pl. viii., fig. 30. 
Dredged in both gulfs and both straits at 12 fathoms, 
75 alive; at 13 fathoms, 6 alive; at 15 fathoms, 51 alive; 
at 17 fathoms, 83 alive; at 20 fathoms, very many; at 22 
fathoms, great numbers; at 27 fathoms, 2 alive; at 30 
fathoms, seyeral dead; at 35 fathoms, off St. Francis Island, 
2 alive; at 40 fathoms, off Beachport, 15 small, dead; and 
at 49 fathoms, 24 small, dead; at 55 fathoms, off Cape Borda, 
7 small, dead; and at 62 fathoms, 27 small, dead; at 90 
fathoms, Cape Jaffa, 10 minute; at 110 fathoms, Beach- 
port, 20 perfect (several alive up to full-grown); at 130 
fathoms, Cape Jaffa, 26 minute and up to adult; at 150 
fathoms, Beachport, 19 perfect, small, and 15 valves; and at 
200 fathoms, 7, dead, very poor. 
oO exarata, n. sp, Verco. Pl. xxyiii., figs. 6 to 8. DZ 
Shell small, solid, oval, compressed dorso - ventrally, 
white. Dorsal valve nearly flat, with a shallow median fur- 
row widening anteriorly; slightly convex longitudinally and 
transversely; lateral margin sinuous, convexo-concave from 
behind, and convex in front to correspond with the median 
sinus. Ventral valve twice as deep as the dorsal, uni- 
formly convex longitudinally. Beak projecting considerably 
beyond the hinge line, solid, slightly curved dorsally. Fora- 
men triangular, completed in front by the dorsal valve, 
rounded behind, and not extending to the end of the beak; 
bounded at the sides by a solid, stout, low lamina. Sculp- 
ture, numerous axial diverging riblets, increasing by inter- 
calation, with concentric riblets, somewhat irregular in size 
and distance. Border internally plicately toothed. The 
hinge teeth in the ventral valve are very low and small 
and tubercle-like. In the dorsal valve the laminz on the 
inside of the tooth sockets are prominent and solid. From 
the anterior end of their bases two short stout processes pro- 
ject forwards ventrally, and converge without uniting. Two 
Db 
