178 TEREBRATULID&. 
B. cumingii, Davidson, P.Z.S., 1852, p. 78, pl. xiv., f- 10-16; 
Reeve, Conch. Le., f. 29. Shell somewhat pyriformly ovate, thick, flex- 
uous at the margin, whitish, tinged with rose; beak acuminately 
produced, but little incurved; foramen small, entire, terminal; deltidium 
obsolete, area impressly concave, rather rough; valves equally convex, 
sides callous within; loop doubly attached, septum large, anchor- 
shaped, callous (Reeve). 
New South Wales. (Angas.) 
Probably my W. ¢apirina (Cat. Tert. Moll. p. 36) is this species ; 
it must not be confounded with Zerebratulina cumingit, David. from 
China, which is very different. 
Genus, KRAUSSIA—Davidson. 
Sub-circular, with a nearly straight hinge line; beak truncated; 
foramen large and round; deltidia small, disunited; beak laterally 
keeled ; hinge area flat ; dorsal valve longitudinally depressed ; internal 
skeleton consisting of a small forked process arising from the septum, 
near the centre of the valve. 
K. lamarkiana, Davidson, P.Z.S., 1852, p. 80, pl. xiv., f. 22-23; 
Reeve, Conch. L¢., f- 34. Sub-orbicular, striated with fine bifurcating 
ridges, light yellow; hinge area well defined, flat; foramen large, 
incomplete ; deltidia small; dorsal valve with a central longitudinal 
groove ; apophysis central, bifurcating ; margins of the valves thickened 
internally and spinulose. 
Length, :25 ; breadth, ‘25 ; height, ‘12. 
Australia. ‘Tasmania. 
FAMILY—RHYNCHONELLID. 
Animal free, or attached by a muscular peduncle issuing from an 
aperture situated under the extremity of the beak of the ventral valve. 
Arms spirally rolled, flexible, and supported only at their origin by a pair of 
short, curved, shelly processes. Shell, structure, fibrous and impunctate. 
Genus, RHYNCHONELLA~— Fischer. 
Trigonal, acutely beaked, usually plaited; dorsal valve elevated in 
front, depressed at the sides ; ventral valve flattened, or hollowed along 
the centre, hinge plates supporting two slender curved lamelle ; dental 
plates diverging. 
R. nigricans, Sowerby, Thes. Conch., i., p. 342, Reeve, Conch., 
Ic, f. 1. Thin, irregular, longitudinally nmbbed; margin crenulated. 
Brown or blackish. 
Length, °7; breadth, °8; height, °4. 
Not uncommon in the South. Chatham Islands. 
