216 



CONCHIFERA. 



Tellina. 



The Portland Stone, Swindon. 



13. Ldcina laminata. — The Laminated Lucina, pi. 

 LXXXIX. fig. 20. 



L. laminata. Phillips, Geo. York, II. p. 209, pi. 5, f. 12. 



Transversely ovate, much compressed, slightly oblique ; an- 

 terior side very short ; beaks obtuse ; posterior side large and 

 rounded ; surface with transverse imbricated ridges. 



The Carboniferous Limestone, Bolland, Yorkshire. 



14.. LnciNA scuLPTA. — The Engraven Lucina, pi. 

 LXXXIX. fig. 8. 



L. scidpta. Phillips, Goo. York, I. pi. 2, fig. 15. 



Sub-trigonal, transversely elongated ; anterior side ex- 

 tremely short and straight, not extending beyond the obtuse 

 beaks ; back nearly straight ; posterior side truncated ; a 

 ridge extending obliquely from the lower side of the beaks to 

 the basal margin, which is straight ; surface with transverse 

 curved ridges posteriorly, which are abruptly angulated from 

 the ridge. 



The London Clay, Speeton, Yorkshire. 



J.'). Lucina du Noyeri. — Du Noyer's Lucina, pi. 

 LXXXIX. fig. 21. 



L. dit Noyeri Portlock, Geo. Rep. p. .'571, pi. 38, fig. 12. 



Orbicular, slightly oblique, compressed ; beaks placed a 

 little towards the anterior side, and protruding a little beyond 

 the hinge line ; surface with fine concentric, thread-like 

 strise. 



The Carboniferous Limestone, Eifel, Tyrone, Ireland. 



10. Lucina flexuosa. — The Flexuous Lucina, pi. 

 LXXXIX. fig. 22. 



L. fiexuosa. Fleming, Brit. An. p. 4-i2. Cryptodon 

 flexitosa. Brown, Illust. Brit. Conch, p. 99, pi. 39, figs. 

 4,5. 



Transversely sub-globular, with a furrow, or flexure, eman- 

 ating from tiie back and terminating on the margin ; surface 

 smooth ; substance of the shell thin. 



The Pleistocene Marine Formation, Dalmuir, Clyde. 



17. Lucina undata. — The Waved Lucina, pi. LXXXIX. 

 fig. 24. 



L. undata. Brown, Illuat. Rec. Conch. Brit. p. 98, pi. 39, 

 figs. 1,2. 



Nearly orbicular, moderately convex, flexuous ; beaks pro- 

 minent and slightly inflated ; surface with numerous fine, 

 close-set, irregular, concentric strias, which, in some instances, 

 run iuto irregular wrinkles. 



The Pleistocene Marine Formation, Ayrshire. 



18. Lucina botundata. — The Rounded Lucina, pi. 

 LXXXIX. fig. 18. 



L. rotundata. Brown, Rec. Con. Brit. p. 98. pi. 40, f. 11. 



Orbicular, moderately convex ; beaks small, nearly central 

 and obtuse, slightly inflated ; surface with very fine concentric 

 strise. 



The Red and Coral Crags, Sutton. 



19. Lucina digitaria. — The Finger- Striated Lucina. 

 Fellina digitaria. Turton, Ann. King. IV. p. 196. Chem- 

 nitz. VI. pi. 12, figs. 120, 121. 



Sub-globular ; surface surrounded with uniform striae, which 

 incline obliquely towards the outer margin, like the lines at 

 the ends of the fingers, giving it the appearance of being 

 spirally striated. 



Genus XLI. — CORBIS. — Cumer. 



Shell transverse, equivalve, free, oval, thick, extremely 

 ventricose, and sub-equilateral ; umbones small and incurved, 

 two cardinal and two lateral teeth in each valve, the posterior 

 one placed nearer to the cardinal teeth than the other, which 

 is rather remote from the umbones, and situate near the termi- 

 nation of the ligament ; two lunulate muscular impressions in 

 each valve, simple, somewhat oblong in form, and placed close 

 behind the umbones ; pallial impression entire, and destitute 

 of a sinus ; ligament external, the parts to which it adheres 

 forming a deep groove when the valves are closed. 



C. Iweis. Plato IX. fig. 17. 



1. Cordis ljevis. — The Smooth Corbis, pi. LXXXIX. 

 fig. 32. 



C. Iweis. Sowerby, VI. p. 156, pi. 580. 



Slightly gibbose, transversely oval, its breadth considerably 

 exceeding its length ; posterior extremity with transverse im- 

 brications, the other portions smooth ; margin entire. 



The Coralline Rag, Malton, and near Oxford ; and the 

 Kelloways Rock, South Cave. 



2. Corbis ovalis. — The Oval Corbis, pi. LXXXIX. f. 28. 

 C. ovalis. Phillips, Geo. York, I. pi. 5, fig. 29. 

 Transversely oblong-oval ; beaks rather large, prominent, 



and incurved ; surface smooth, with distinct concentric lines 

 of growth. 



The Kelloways Rock, Scarborough. 



3. CoBBis uniform is. — The Uniform Corbis, pi. LXXXIX. 

 fig. 4. 



C. uniformis. Phillips, Geo. York, I. pi. 12, fig. 3. 



Oval, slightly contracted at both extremities ; beaks central, 

 and hardly produced ; surface smooth, with indistinct lines of 

 growth. 



The Upper Lias Shale, Whitby, Yorkshire. 



Genus XLIL— TELLINA.— iiwn«BMs. 



Shell compressed, transverse, sub-equivalve, inequilateral ; 

 posterior side usually rounded ; the anterior somewhat pro- 

 duced, or beaked and angular ; anterior ventral margin with 

 an irregular flexuosity ; generally with two cardinal teeth in 

 each valve, but only one in some instances ; usually two late- 

 ral teeth in both valves ; but sometimes with only one, and, for 

 the most part, remote from the primaries ; two distant mus- 

 cular impressions ; pallial impression with a very large sinus ; 

 ligament external. 



1. Tellina donaciales. — The Donax-like Tellina, pi. 

 LXXXIX. fig. 51. 



Tellina donaciales. Lamarck, Ann. du Mus. VII. p. 233, 

 No. 5. Deshayes, Coq. Foss. p. 83, pi. 12, figs. 7, 8, 11, 12. 



Shell obliquely ovate ; sub-trigonal, inequilateral, smooth 

 and thin ; anterior side short and rounded ; very slightly in- 

 flexed and sub-angulated. 



Found in the London Clay at Iledgerly. 



2. Tellina sub-rotundus. — The Half-rounded Tellina, pi. 

 LXXXIX. fig. 46. 



