Terebbatula. MOLLUSCA. ACEPHALA. 373 



56. T. Fimbria Orbicular, globose ; margin undulalo-plicated Sower. 



Min. Conch, t. cccxxvi. — Under Oolite. 



57. T. cordiformis. — Heart-shaped, front much elevated, with a deep sinus 

 in the margin ; sides rather convex, sharp-edged ; middle ornamented with 

 several acute furrows, reaching almost to the beaks. — Sower. Min. Conch, 

 t. ccccxcv. f 2, 4. — Carboniferous Limestone, Ireland. 



58. T. reniformis Reniform, middle furnished with 3 or 4 longitudinal 



ridges, terminated by acute plaits in the much elevated margin of the front ; 

 sides inflated below the entire edges — Sower. Min. Conch, t. ccccxcvi. f. 1-4. 

 — Carboniferous Limestone, Ireland. 



59. T. platyloba.— Transversely obovate, depressed; front elevated, with 

 several acute plaits in the middle of the sinus ; sides with one or two obscure 

 plaits upon their edges Sower. Min. Conch, t. ccccxcvi. f. 5, 6 — In Carboni- 

 ferous Limestone at Clitheroe. 



60. T. Pugnus Obovato-deltoid, rather depressed ; front much elevated, 



with from 4 to 6 plaits in the middle of the sinus ; sides convex, with several 



plaits upon their edges Anomites Pugnus, Mart. Derb. t. xxiii. f. 4, 5. — T. 



Pug. Soiver. Min. Conch, t. ccccxcvii — In Carboniferous Limestone. 



61. T. lata Transversely oblong, convex, regularly plaited ; front elevat- 

 ed ; the perforated valve flattest, with a produced beak ; plaits 40 — Sower. 

 Min. Conch, t. Dii. f. 1. — In Green Sand. 



62. T. depressa. — Triangular, depressed, regularly plaited ; front elevated ; 

 lateral angles rounded ; beaks produced ; plaits 20 — Sower. Min. Conch, t. Dii. 

 f. 2— In Green Sand. 



63. T. nuciformis. — Transversely oblong, globose, regularly pliated ; front 

 elevated ; beak produced ; plaits 30, rounded. — Sower. Min. Conch, t. Dii. 

 £ 3. — In Green Sand. 



64. T. acuta Transversely oblong, gibbose, largely plaited ; front elevat- 

 ed with six plaits, of which the lateral are the largest; beak slightly pro- 

 duced ; plaits 20, sharp Sower. Min. Conch, t. Dii. f. 4 — In Lias, Clieve 



Hill, near Cheltenham. 



65. T. plicatella Subglobose, rather square, plaited ; front elevated ; beak 



small, with a broad oblong concave space on each side ; plaits 40, rounded — 

 Sower. Min. Conch, t. Diii. £ 1 — In Inferior Oolite. 



66. T. serrata. — Rounded triangular, convex, with a blunt margin, largely 

 plaited ; beak small, with a large, nearly flat, space on each side of it ; plaits 

 sharp, about 11, of which, 5 are a little raised in front — Soiver. Min. Conch, 

 t. Diii. £ 2. — In Lias. 



67. T.flabellula Depressed, plaited; plaits about 16, simple, rounded ; 



lesser valve transversely obovate ; larger valve with a straight, rectangular, 

 projecting beak. — Soiver. Min. Conch, t. dxxxv. £ 1 — In Oolite. 



68. T.furcala Nearly orbicular, plaited; plaits rounded, about 9 in num- 

 ber, forked when full grown ; the larger valve most convex ; its beak large, 

 curved.— Sower. Min. Conch, t. dxxxv. £ 2 — In Oolite. 



69. T. orbicularis Uniformly convex, plaited ; plaits angular, simple, 



about 15 ; lesser valve orbicular, the other with a large curved beak. — Sower. 

 Min. Conch, t. dxxxv. £ 3 In Lias. 



70. T. oblonga Oblong, gibbose, plaited; plaits 16 or more, forked, their 



edges rounded; beaks large, broad, slightly incurved.— .SWo - . Min. Conch. 

 t. dxxxv. £ 4, 5, 6— In Green Sand. 



