TRIBE BRACHIOPODA. 325 



T. Rubella. Sow. Tk. 1, p. 350, t. 69, /. 40, 1, 2.— Terebra- 

 tella R. Gray, Brack, p. 90. Nearly oval, rather acuminated 

 dorsally, a little gibbous, slightly sinuated ventrally ; valves unequal, 

 smooth, red ; margin entire, a little sinuated ventrally. Upper valve 

 reflected, without any mesial ridge, but with a very obsolete mesial 

 furrow ; perforation small ; hinge-area narrow, rounded at the sides, 

 with rather large united deltidia. Lower valve ovate, with a broad 

 mesial groove forming a ventral sinus : internal appendage as in 

 Flavescens. £«<•-§-• Japan. 



T. Sanguinea.— Anomia S. Ch. /. 706.— D. p. 993.— A. San- 

 guinolenta, Gm. — W. t. J 1, /. 21. — T. Erythroleuca, Quoy, Ast. 

 t. 85,/. 8, 9.— Desk. ed. Lam. l,p. 350.— T. S. Sow. Th. I, p. 357, 

 t. 71, /. 71, 2, 3. — Terebratella S. Gray, Brack, p. 90. Sub- 

 orbicular, slightly notched at the ventral edge, rather gibbous, thin, 

 of a bright light red, with rays and radiating spots of white ; margin 

 entire, not waved, slightly sinuated ventrally. Upper valve rather 

 acuminated dorsally and truncated ; perforation middle-sized, com- 

 plete ; hinge-area rather broad, with sharpish edges ; deltidia rather 

 large, united. Lower valve somewhat depressed, transversely ob- 

 ovate ; internal appendage at first forming two rays, then a central 

 ring and two lateral loops, at length a reflected upper loop united to 

 the central ring. -^. Philippines. 



T. Frontalis. Middend. Mai. Ros. 3, p. 2 ; Sibir, p. 241, t. 18, 

 /. 9 to 14. — Terebratella F. Gray, Brack, p. 80. Suborbicular, 

 rather solid, almost smooth, dirty yellowish, devoid of mesial ridge or 

 groove ; valves equally convex ; margin hardly waved, quite entire. 

 Upper valve produced, scarcely recurved and broadly truncated dor- 

 sally ; perforation very large, incomplete. Smaller valve roundish or 

 transversely oval : loop elongated, doubly attached, f . Siberia. 



T. Spitzbergensis. — Terebratella S. Davids. Z. P. 1852 ; 

 Ann. N. H. 1855, t. 10, /. 3. — Gray, Brack, p. 91. Small, oval, 

 elongated, smooth, pale horn-coloured ; valves almost equally convex, 

 margins even ; dorsal valve slightly depressed in front ; beak pro- 

 duced, recurved, obscurely keeled ; perforation moderate, incomplete ; 

 deltidium of two distinct elongated plates ; loop elongated, reflected, 

 attached near the extremity of the prominent central septum. i...$ . 

 Spitzbergen. 



*** Surface minutely skagreened ; with radiating sculpture. 



T. Dorsata. — Anomia Striata, &c. Ck. 8./. 710. — A. D. Gm. — 

 D.p. 295.— IF. 1. 11,/. 26.— T. D. Lam. S.—E. t. 242,/. l.—Sow. G. 

 —Reeve, t. 126, / 3.— Sow. Th. 1, p. 346, t. 68, / 15, 6, 7.— Tere- 

 bratella D. Gray, Brack, p. 87. Suborbicular-trapezoidal, rather 

 gibbous, whitish ; valves unequal, with radiating ridges ; margin 



