TRIBE BRACHIOPODA. 333 
Minute, more or less orbicular or semicircular, retuse ventrally, 
depressed, subequivalve, horn-coloured, shagreened, but otherwise 
smooth; mesial groove distinct; hinge-line straight, much produced ; 
hinge-area depressed, triangular; perforation very large, intruding 
upon the lower valve: inner edges radiatingly scabrous: a single 
median septum, and a two-lobed loop. §. Zetland. 
LINGULA. 
Thin, subequivalve, equilateral, ovate-elongated, depressed, subtrun- 
cated at one end, subacute at the other, fixed to a peduncle; devoid of 
hinge or ligament ; muscular impressions several in each valve, arranged 
in pairs. 
L. Anatina. Lam. Syst. Anin.—Lam. 1.—Bl. t. 51, f. 3.—Sow. G. 
Ling. f. 4, 5.— Reeve, C. S. t. 125, f. 3—Kust. vii. 1, t.1, f.1, 2, 3.— 
Sow. Th. 1, p. 337, t..77, f. 1, 2, 38, 9, 10.—Myrinvus Lineva, D. p.322. 
—W.t.12, f.45. Oblong, compressed, slightly striated longitudinally, 
equal in width at both ends, green or brown; broad end somewhat 
trilobate: one of the valves longitudinally thickened near the centre 
within. 14. Philippines and Moluccas. 
L. H1ans. Swains. Phil. Mag. 62.—Sow. Th. 1, p. 388, t. 77, f. 4.— 
? L. Anronu, Aust. vii. 1, t. 1, f. 7, 8,9. Hlongated-oblong, very 
thin, rather narrow, greenish; gradually attenuated and rather convex 
towards the tapering extremity. 2...12. China. 
L. AuprBarpi. Brod. Z. P. 1833, p.100; Z. T.1, p. 2, t.3, f. 14. 
— Desh. Lam. 7, p. 390.— Reeve, C. S. t. 125, f. 1.— Sow. Th. 1, 
p- 392, t. 67, f.5. Hlongated-oblong, glabrous, pale yellow, con- 
centrically painted with green; broader extremity somewhat square- 
shaped (in the dried individual), adjacent to it the valves are a little 
contracted, but again swell out before the final attenuation. 1. Bay 
of Guayaquil. 
L. Semen. Brod. Z. P.1833, p.100; Z. T.1, p. 2.—Sow. Thes. 
Conch. 1, p. 392, t. 67, f. 11. Ovate-oblong, thickish, flattened, 
whitish, very smooth and polished; broader end rounded. 2...4. 
W. Columbia. Resembling a melon-seed in size and appearance. 
L. Tumiputa. Reeve, Z. P. 1841, p.100; C. 8.1. t. 125, f. 4.— 
Sow. Thes. Conch. 1, p. 393, t. 67, f. 7. Broader in proportion than 
any known species, thin, horny, subquadrate, of a rufous colour, 

1 Compare with this the Pinna Uneutis seu Lineua of Ch. f. 1675, 
6, 7, termed L. Cuemnirzit by Kuster (vii. 1, t. 1, f. 7, 8, 9). 
