Geyph^a. 



CONCHIFERA. 



149 



form, but always longer than wide ; bingo-pit narrow and much 

 curved. 



Portland Sand, Dinton, Buckingbamsbire. Tbe Kimmeridge 

 Clay, Aylesbury, and Oxford Clay, Dorsetshire. 



10. Ginpu.EA MiNUTA. — The Minute Gryphma, pi. LXI. 

 figs. 10, 11, 12. 



G. minuta. Sowerby, VI. p. 90, pi. 547, fig. 4. 

 Orbicular ; shell thin ; gibbose ; beak spiral ; the lobo ob- 

 scure ; much compressed. 



Great Oolite, Ancliff, Wiltshire. 



11. GuYPn-fiA OBLIQUATA. — Tiio Obliquc Grypha^a, 

 pi. LXI. figs. 16,17. 



G. oUupiata. Sowerby, II. p. 2-t, pi. 112, fig. 3, Goldfuss, 

 pi. 85, fig. 2. 



Obliquely oblong-ovate ; a little involute ; an obscure lobe on 

 the rigiit side ; smaller valve irregularly ovate, and externally 

 concave ; beak pointiug to the right side. 



Lias, Gloucestershire. 



12. Gryph^ea sinuata. — The Bent Gryphaja, pi. LX. 

 fig. 5. 



G. sinuata. Sowerby, IV. p. -IS, pi. 336, Phillips, I. p. 94, 

 pi. 2, fig. 23. 



Obliquely ovate ; larger valve very concave, much bent, 

 with one side completely flattened, towards which tbe umbo 

 is inclined, curved, and very small ; lesser valve quite flat and 

 triangular ; surface rather smooth, with numerous equidistant 

 lines of growth ; hinge-pit marginal, long, narrow, and curved. 



Lower Greensand, Kent and Sussex ; Speeton Clay, Spee- 

 ton, Yorkshire. 



13. GuYPiLEA VESICULOSA. — The Bladder Grypha;a, 

 pi. LXI. figs. 8, 9. 



G. vesiculosa. Sowerby, IV. p. 93, pi. 369. 



Sub-rbomboidal, oblong, deep ; lesser valve concave, small, 

 and curved ; composed of various distant laminae ; beaks point- 

 ed, and the hiuge small ; width and depth nearly equal ; lobe 

 distinct, but not sharply defined ; surface smooth. 



Chalk at Lyme Regis. 



14. Grypd^a PniLLiPSii. — Phillips' Grypba;a, pi. LXI. 

 figs. 1 3, 1 4. 



Gryphea ? Phillips, Geo. York, I. pi. 9, fig. 26. 



Longitudinal, incurved ; beaks rather large ; and both valves 

 inflated. 



Upper Lias Shale, Yorkshire. 



IS.Grypii^a nALioToiDEA. — The Ilaliotis-formedGrypbasa, 

 pi. LX. figs. 6, 7, 8, 9. 



Exogyra Haliotoidea. Goldfuss, pi. 88, fig. 1. Chama 

 Haliotoidea. Sowerby, I. p. 67, pi. 25, fig. 2. 



Oval, compressed ; one valve deeper than the other, and 

 provided internally with a deep curved groove, extending from 

 below the beak on one side ; the other parts of the valve very 

 shallow ; margin thin, broad, and slightly fringed externally, 

 and crenated internally, with a large muscular impression ; 

 surface transversely wrinkled ; beaks slightly involute ; nearly 

 the whole surface of the under valve attached ; length about 

 1 J inch. 



Upper Greensand, "Warminster and Blackdown. 



IG. Gryph^a recurvata. — The Recurved Gryphaa, 

 pi. LX. tig. 4. 



Chama recurvata. Sowerby, I. p. 69, pi. 26, fig. 2. 



Sub-rotund ; one valve very convex and conical, with its 

 apex curved, the other shallow and lid-shaped ; beak sub- 

 involute, hinge indistinct, and the surface smooth. 



Tbe Upper Greensand, Halldown, near Exeter. 



17. Grypilsa conic a. — The Conical Grypha;a, pi. LX. 

 figs. 3, 11, 12,13. 



Chama conica. Sowerby, I. p. 09, pi. 26, fig. 3, and pi. 605, 

 figs. 1, 2, 3. 



Oblong, curved ; the convex and larger valve considerably 

 longer than the other, with a conical obtuse beak, and a small 

 wing-like process ; lesser valve oval, flat, with the margin and 

 wing crenated ; hinge formed like a ball and socket. 



The Upper Chalk, Charlton ; the Under Greensand, Dor- 

 setshire and Wiltshire ; the Gault, Hythe and Cambridge- 

 shire ; and the Greensand, Dorset and Devonshires. 



18. Gryph^a plicata. — The Plaited Gryphaja, pi. LXI. ' 

 fi gs. 26, 27, 28. 



G. p/icata. Goldfuss, pi. 87, fig. 5. 



Oblong-ovate, much arcuated ; beaks much incurved, sur- 

 face very rugged, with transverse and longitudinal, irregular, 

 strong, waved, striated ridges and furrows ; margins scolloped, 

 inside deep, with a very large, well-defined muscular impres- 

 sions under the beak. 



In the Chalk, Sussex. 



19. Gryph^a digitata. — Tbe Fingered Gryphoea, pi. LX. 

 fig. 16. 



Chama digitata. Sowerby. II. p. 165, pi. 174. 



Obliquely elongated, curved, and gibbose ; with five or six 

 marginal, elongated, canaliculated, finger-like processes ; sur- 

 face smooth ; deeper valve with several ridges. 



The Greensand, Lyme Regis. 



20. Gryphjea L/Evigata. — The Smooth Grypba;a, pi. LX. 

 fig. 17. 



Exogyra laevigata. Sowerby, VI. p. 220, pi. 605, fig. 4. 



Slightly elongated, curved, and smooth ; deeper valve some- 

 what inflated, and obtusely carinated near the hollow side ; 

 flat valve semicircular, with a small pointed beak. 



Tbe Upper Greensand, Worbarrow Bay, and the Lower 

 Greensand, Sandgate and Berehead. 



21. Grypii^a undata. — The Waved Gryphsea, pi. LX. 

 figs. 14, 15. 



Exogyra undata. Sowerby, VI. p. 220, pi. C05, figs. 5, 6, 7- 

 Elongated, convex ; deeper valve carinated along the centre ; 



with a series of branching ribs, that diverge from the keel ; 



flat valve smooth and plain. 



Upper Greensand, Western Lines, Isle of Wight, and 



Blackdown. 



22. Gryphjea bulla. — TheVesicularGryphaea,pl.LXVI.** 

 fig. 22. 



Exogyra bulla. Sowerby, Geo. Trans. 2d. Ser. IV. p. 346, 

 pi. 22, tig. 1. 



Oblong, convex ; beaks short, and laterally curved ; sur- 

 face nearly smooth ; form in general extremely variable. 



The Purbeck, Durlestone, Dorsetshire. 



23. Grypu^ea canaliculata. — The Canaled Grypbasa, 

 pi. LXI. fig. 18. 



Chama canaliculata. Sowerby, I. p. 68, pi. 26, fig 1. 

 Obloug-oval, rather depressed, transversely and concentri- 

 cally furrowed ; deeper valve with a wing-shaped, lateral. 



