TRIBE BRACHIOPODA, S20 
slope inwards; internal appendage consisting of a single elevated 
projecting rib. 4...3. Brazil. 
T. AnomrorpEs.—Ortuts A. Scacchi and Phil. 2, p. 69, t. 18, f. 9. 
—T. Appressa, Forbes, Report Brit. As. 18438, p. 193.—Morrista 
Seminutum, Davids.—M. A. Gray, Brach. p.108,f.17, 18.—Woodw. 
f. 119. Minute, circular, depressed, smooth, olive-green, translucent ; 
perforation large and round, encroaching equally on both valves, area 
of the upper valve chiefly occupied by it; deltidia rudimentary ; 
lower valve deeply notched at the umbo ; loop consisting of two simple 
plates attached to the sides of the umbonal notch and to a central 
bifurcated process. +4. Mediterranean.” 
T. Luntrera. Phil. Sic. 1, p. 97, t. 6, 7.16; 2, p. 69 (as OrntuHIs L.). 
—Morrisia L, Gray, Brach. p.108. Minute, subcordate, compressed, 
retuse ventrally, bluntly peaked dorsally; area moderate; internal 
skeleton consisting of a semilunar plate in the centre of the smaller 
(lower) valve. %. Mediterranean. 
T. Davipsont.— Morrista D. Deslongchamps, Ann. N. H. 1855, 
t. 10, f. 20. Transverse, irregularly oval (but variable in shape), 
coarsely punctate, thin, light yellowish, covered with spinous asperities 
that are chiefly manifest near the margin. Upper valve convex ; 
hinge-line straight; area narrow; deltidia very small, edging only the 
very small portion of the foramen existing in this valve. Lower valve 
flat; with a large circular perforation. 1...;. Tunis? 
T. PutcHetia. Sow. Thes. Conch. 1, p. 360, t. 71, f. 105, 6, 7.— 
Meceruia P. Gray, Brach. p. 104.  Subovate, acuminated and 
rounded dorsally, smooth, whitish, with a few radiating red lines, 
inequivalve; margins entire, somewhat flexuous. Upper valve rather 
flattened, acuminated dorsally, rounded ventrally ; perforation large, 
incomplete; cardinal area indistinct, its sides rounded; deltidia 
small, separate. Lower valve somewhat circular; internal appendage 
consisting of a single prominent gnomon near the ventral portion. 
4. Philippines; Isle of Cocos. ‘ Loop small, trebly attached” (Gray). 
1 The genus BoucuarptA of Davidson was formed for this species. 
‘“‘ Beak prominent, with a minute apical foramen; deltidium blended 
with the shell; apophysis anchor-shaped, the central septum being 
furnished with two short lamelle. 
2 This and the two following are the only known recent species of 
Davidson’s subgenus Morrisia. ‘Shell with a large foramen en- 
croaching (equally for the most part) on both valves; ventral (upper) 
valve with a small straight area; loop not reflected, united to a small 
forked process in the centre of the valve; structure coarsely punc- 
tate” (Gray). 
