140 



MOLLUSCA. 



Terebratulj 



This species bears a resemblance to the Terebratula Tespertilio of 

 Brocci, but is not so wide, nor so distinctly trilobate. 



Greensand, Blackdown. 



110. Tebebkatula megathema? — The Largely-Perforated 

 Terebratula, pi. LV.* fig. 100. 



T. megatrema. Sowerby, Geo. Tr. 2d Ser. IV. p. 343, pi. 

 18, fig. 3. 



Transversely obovate, moderately convex ; beak large, 

 rounded and produced, with a very ample perforation ; surface 

 with a few large, distant, rounded divergent ribs. 



Greensand, Blackdown. 



1 1 1. Tekebratula psittacus. — The Parrot-beak Terebra- 

 tula, pi. LV.* fig. 56, 57. 



T.psittacca. Bruguiere, Ency. Meth pi. 244, fig. 3. Tur- 

 ton. Conch. Diet. pi. 11, fig. 42. Brown, Illust. Conch. Brit, 

 p. 68, pi. 46, fig. 2, 3, 4. 



Convex, nearly globose ; beaks greatly produced and curved ; 

 sides abruptly turned inwards, and provided with a few longi- 

 tudinal striffi ; front margin somewhat indented on both sides, 

 and produced in the middle, invested with five longitudinal 

 divergent stria) ; perforation subtriangular. 



Pleistocene Marine Formation, Ayrshire, Scotland ; and 

 Mammaliferous Crag, Bramerton. 



112. Terebratula triplicata. — The Three-plaited Tere- 

 bratula, pi. LV.* fig. 60. 



T. triplicata. Phillips, Geo. York. L p. 134, pi. 13, 

 fig. 22. 



Transversely elongated ; much inflated ; beak short and ob- 

 tuse ; upper valve convex, with three large and deep longitu- 

 dinal folds ; under valve concave, with three large and deep 

 plaits. 



Lias, Yorkshire. 



113. Terebratula tumida. — The Tumid Terebratula, pi. 

 LV.* fig. 65. 



T. tumida. Phillips, II. p. 222, pi. 12, fig. 35. 



Obovate, tumid ; beak indistinct ; lower valve flatter than 

 the other; surface with rather large longitudinal ribs, 

 stronger and rounded in the centre, smaller and curved on 

 the sides. 



Carboniferoui3 Limestone, Bolland. 



114. Terebratula bidens. — The Two -toothed Terebratula, 

 pi. LV.* fig. 95. 



T.bidens. Phillips, I. p. 134, pi. 13, fig. 24. 



Suborbicular ; beaks small ; upper valve convex, lower one 

 concave, each provided with two very large central and deep 

 plaits, with two tooth-like plaits in the sides. 



Lias, Wilton Castle, and Staithes. 



115. Terebratula comta. — The Elegant Terebratula, pi. 

 LV.* fig. 77, 78. 



T. comta. Phillips, Pal. Foss. p. 89, pi. 35, fig. 161. 

 Oblong, convex, pentahedral ; beak long, nearly straight ; 

 surface with numerous rounded ribs ; front elevated. 

 Devonian Shales, Newton and Barton. 



116. Terebratula FERITA.— The ■ Terebratula, pi. 



LVI. fig. 5, 6. 



T. ferita. Phillips, Pal. Foss. p. 89, pi. 35, fig. 163. Von 

 Bucb, pi. 2. fig. 37, a, h, c. 



' Subtriangular ; beak long, straight, and acute ; lateral angles 

 truncated, depressed ; surface with a few very large ribs, and 

 deep intermediate furrows, curved on the sides, and trans- 



versely striated; hinge line very short and straight; space 

 under the beak of lower valve depressed. 



Devonian Shales, Barton, Plymouth, and Newton. 



117. Terebratula proboscidalis. — The Trunked Tere- 

 bratula, pi. LVI. fig. 22, 23. 



T. proboscidalis. Phillips, Pal. Foss. p. 84, pi. 34, fig. 1 49, 

 a, h. 



Elongated ; beak prominent ; front margin broad and pro- 

 truding ; middle of the valves uniformly convex in the centre ; 

 surface with numerous equal strite, which are most conspicuous 

 near the edges. 



Devonian Limestone, Hope, near Torquay. 



118. Terebratula RADiALis. — The Radiating Terebratula, 

 pi. LVI. fig. 16, 17. 



T. radlalis. Phillips, II. p. 223, pi. 12, fig. 40, 41. 

 Orbicular, destitute of a mesial fold ; beak slightly ele- 

 vated, straight ; surface with many equal rounded radiating 

 ribs. 

 Carboniferous Limestone, Bolland. 



119. Terebratula quadrata. — The Square-shaped Tere- 

 bratula, pi. LVI. fig. 24, 25. 



T. quadrata. Sowerby, Geo. Tr. 2d Ser. IV. p. 338, pi. 14, 

 fig. 9. 



Oblong-ovate, gibbose ; beak large ; base nearly parallel ; 

 both valves with eight or nine large, rounded, longitudinal ribs. 



Lower Greensand, Hythe. 



120. Terebratula subplicata. — The Half-plaited Tere- 

 bratula, pi. LVI. fig. 27, 28. 



T. sub/dicata. Mantell, Geo. Suss. p. 211, pi. 26, fig. 5, 6, 1 1. 



Transversely ovate ; gibbous, nearly smooth ; beak very 

 slightly produced; upper valve convex, lower valve depressed ; 

 margin serrated ; front sinuate, with three or four sharp pluits. 



Upper Chalk, near Lewis. 



121. Terebratula HEMit^piiERicA. — The Hemispherical 

 Terebratula, pi. LVI. fig. 41, 42. 



T. hemispherica. Sowerby, VI. p. 69, pi. 536, fig. 1. 



Hemispherical; beak produced, incurved ; lesser valve nearly 

 flat, with numerous longitudinal granulated ribs ; margin 

 toothed. 



Great Oolite, Ancliff, Wiltshire. 



122. Terebratula kigida. — The Rigid Terebratula, pi. 

 LVI. fig. 43, 44. 



T. rigida. Sowerby, VI. p. 69, pi. 536, fig. 2. 



Orbicular ; beak small ; lesser valve nearly flat ; larger 

 valve very convex ; surface with numerous, granulated plaits, 

 increasing in number towards the margin ; front even. 



Upper Chalk, Trimmingham. 



123. Terebratula striatula. — The Finer-Striated Tere- 

 bratula, pi. LVI.* fig. 36, 27, aud 38 Var. 



T. striatula. Sowerby, VI. p. 69, pi. 536, fig. 3, 4, 5. 

 aiantell, Geo. Suss. p. 131, pi. 25, fig. 7, 8, and 12. Phillips, 

 I. pi. 2, fig. 28. 



Longitudinally oblong-ovate, compressed ; beak large, but 

 short, with a large circular aperture ; front truncated, some- 

 times furnished with a sinus ; surface with numerous very fine 

 granulated stria;, many of whicli are forked. 



This species is liable to considerable variety of form, swne specimens 

 being nearly orbicular. 



London Clay, Isle of Skepey ; Upper Chalk at Norwidi ; 



