324 TESTACEOUS MOLLUSCA. 
T. Corganica. Adams and Reeve, Samar. p. 71, t. 21, f. 3.— 
TEREBRATELLA C. Gray, Brach. p. 88. Subquadrangular. smooth, 
pale brown, with crimson rays; beak obtuse, with lateral ridges ; 
upper ire convex, somewhat keeled in the middle; lower caine the 
more depressed, somewhat pinched near the sides ; hinge- area large ; 
deltidia united; perforation large, complete, angular at the Pacer 
loop elongated, doubly attached. 1 ;. Corean Archipelago.! 
T. BoucHarpia.— TEREBRATELLA B. Davids. Z. P. 1852, t. 14, 
f. 4, 5, 6.—Gray, Brach. p. 88. Suborbicular, smooth, of a uniform 
light yellow: beak produced, recurved, furnished with lateral ridges, 
and truncated by a large circular entire perforation ; deltidia united ; 
hinge-area slightly concave; lower valve depressed in the middle 
ventrally ; loop elongated, doubly attached. 1+. 
T. Rupicunpa. Don. Nat. Rep. t. 56, f. 2, 3, 4 —-Sow. Th. 1, p. 351, 
t. 70, f. 45, 6, 7.—T. Ixconspicua, Sow. Th. 1, p85; HALF. 102, 3,4. 
—TEREBRATELLA R. Gray, Brach. p. 89. Nearly orbicular, rather 
acuminated dorsally, red, gibbous, smooth; valves unequal, rather 
irregular; margin entire, slightly flexuous on the sides, its ventral 
portion sinuated. Upper valve produced and truncated dorsally, its 
perforation large, oblique and nearly entire; cardinal area rounded ; 
deltidia large, separate; mesial ridge broad and prominent, angularly 
rounded and obtuse on both sides. Lower valve somewhat pen- 
tagonal, dorsally narrow, broad and somewhat angularly rounded in 
the middle, slightly truncated ventrally; mesial groove broad and 
distinct ; loop elongated, doubly attached. 1. N. Zealand.? 
T. Transverss. Sow. Th. 1, p. 361, t. 72, f. 114, 115.—TERE- 
BRATELLA T., Gray, Brach. p. 89. 'Transversely subovate, thin, pale 
horn-coloured, smooth, merely wrinkled by the lines of growth. 
Upper valve somewhat tetragonally ovate, very obtusely angular and 
reflected dorsally; perforation very large, incomplete; hinge-area 
large and flattened; deltidia small and distant ; mesial ridge rounded 
and indistinct. Lower valve transversely oblong, very obtusely 
angulated dorsally; mesial groove rounded, indistinct. Margin 
entire, somewhat flexuous. Ge sl 
1 This, the next thirteen species, and 'T. Evansit and CRENULATA 
(teste Davidson) belong to the subgenus 'TEREBRATELLA, which has 
been thus defined :—* Loop elongated, reflected, doubly attached, to the 
hinge-plate, and also to the longitudinal septum, by processes: given 
off at right angles from the crura near the centre of the valve.” 
2 Woodward suggests that the WaLron1A VALENCIENNEI of David- 
son may possibly prove the fry of this species with the reflected 
portion of the loop wanting. 
