230 Miscellaneous. 
Family ANATENIDA. 
Cyatuoponta, Con. 
An inequivalved bivalve ; hinge with a broad, not very projecting, 
cartilage-fosset, which is carinated near the margin; muscular im- 
pressions rounded, indistinct ; pallial impression with a large rounded 
sinus. 
C. undulata. Subovate, inequilateral, very thin and fragile, with 
obliquely concentric undulations, profound on the anterior side, and 
suddenly becoming obsolete towards the posterior extremity, which 
is truncated and direct ; posterior slope of the deeper valve obscurely 
tricarinated ; cartilage-pit robust ; valves with minute, very closely 
arranged, granulated radiating lines. 1 2-10: 1 nearly. 
Family Pootapip2z. 
Puoxapopsis, Con. 
Inequivalved ; right valve produced posteriorly, left valve over- 
lapping the opposite ; cartilage situated on a projecting callus. 
P. pectinata. Ovate, very thin and fragile, profoundly gaping 
posteriorly ; profoundly ventricose anteriorly ; valves with elevated 
waved laminz terminating near a profound sinus, which extends 
from beak to base; right valve undulated near the posterior end, 
reflected, margin pectinated ; both valves have concentric lines. 
PARAPHOLAS, Con. 
P. bisulcata. Ovate-oblong ; anterior accessory valves or deposit 
strong, shining, gibbous on the margin of aperture, and having 
obscure decussated striz, the transverse ones a little raised ; anterior 
side of the larger valves with numerous prominent crenulated radii ; 
a slightly oblique sulcus extends from beak to base, and a slightly 
impressed line runs from the beak to the posterior end of the closed 
portion of the base ; between the two impressed transverse lines the 
valves have closely-arranged, rugose, longitudinal lamine, and pos- 
terior to these the laminz are remote and elevated. 23. i 
PENITELLA. 
P. Wilsonii. Ovate-oblong, very thin, profoundly ventricose ; 
valves with a furrow from beak to base; the papyraceous anterior 
valves very wide; anterior valves with numerous oblique waved 
laminz and radiating acute ribs ; ligament margin sinuous ; posterior 
side with concentric distant undulations ; two small accessory valves 
behind the beak, which are reflected posteriorly ; membranaceous 
appendage with a sinuous or concave margin where it joins the 
shell, and a deep annular groove anterior to the middle. 24. 
TRITON. 
T. perforatus. Subpyriform; volutions 5 or 6; ribs revolving, 
flattened, slightly prominent, wide and narrow alternately, with 
narrow interstices, and an occasional revolving line; angle of body 
whorl tuberculated ; spire scalariform, the angle of each whorl witha 
tuberculated rib or carina; colour cinereous; epidermis brown, rough, 
hairy, longitudinally ribbed ; aperture wide ; margin of labrum sinu- 
