MoDIOKa. 



CONCHIFERA. 



17.3 



ami aro lost near the beaks ; depth of the united valves ex- 

 ceeding the length of the shell. 



The Lower Greensand, Ilythe. 



1*. MoDioLA MINIMA. — The Small Modiola, pi. LXXII. 

 fig. 28. 



M. minima. Soworby, III. p. 19, pi. 210, figs. 5, 6, 7. 



Sub •triangularly ovate, its width one and a-half its length ; 

 sides nearly rounded, broad anteriorly ; posterior lobe small, 

 distinct ; front nearly straiirht ; beaks small. The margin 

 forming a prominent angle with the hinge-lino at their junction ; 

 surface smooth. 



The Lias, north of Shropshire, and Vale of Gloucester. 



15. Modiola giudo.sa. — The Gibbous Modiola, pi. LXXIL 

 figs, o, G. 



M. ffihhosa. Sowerby, IIL p. 19, pi. 211, fig. 1. 



Transversely elongated ; reniform, very gibbose ; its width 

 double its length ; depth of each valve nearly equal to the 

 length ; back broad, arcuated ; posterior lobe well defined 

 and inflated; surface smooth. 



Great Oolite, Anclifi' and Bradford, and the Inferior Oolite, 

 Cotewold Hills. 



16. Modiola ke.mfokmis. — The Kidney-shaped Modiola, 

 pi. 1-XXII. figs. 32, 33. 



M. renifonnis. Sowerby, III. p. 20, pi. 211, fig. 3. 



Transversely-oblong, sub-reniform ; its width not twice its 

 length ; anterior lobe considerably expanded and pointed ; pos- 

 terior lobe small; surface smooth ; centre of the front consider- 

 ably indented. 



The Inferior Oolite, near Bath. 



17. Modiola sud-carinata. — The Sub-carinated Modiola, 

 pi. LXXII. figs. 21, 22. 



M. mb-carinata, (?) Sowerby, III. p. 17, pi. 210, fig. 1. 

 Lamarck, Foss. de. Paris, p. 191 ; Ann. du Mus. VI. p. 122, 

 and IX. pi. 17, fig. 10. 



Transversely-oblong ; its width double its length ; front 

 arcuated ; anterior side keel-shaped ; pusterior lobe convex 

 and rather obtuse ; surface smooth, with woU-definod lines of 

 growth. 



The London Clay, Highgate. 



18. Modiola bipautita. — The Two-parted Modiola, pi. 

 LXXII. figs. 9, 10, and pi. LXXI. figs. 22, 2.3. 



M. liparlita. Sowerby, III. p. 17, pi. 210, figs. 3, 4. 



Transversely elongated; its width more than twice and a- 

 half its length ; somewhat gibbose and smooth ; anterior side 

 obtuse, abruptly raised above the posterior; the posterior lobe 

 irregular ; beak sub-carinated ; front waved. 



19. JIodiola ^.qualis. — The Equal Modiola, pi. LXXII. 

 fig. 3j. 



il. (Bqitalig. Sowerby, III. p. 18, pi. 210, fig. 2. 



Transversely oblong, convex, smooth ; anterior lobe ob- 

 scurely defined ; front nearly parallel ; width not quite twice 

 its length. 



The Lower Cireensand, Parham, Sussex. 



20. Modiola li.neata. — The Lineated Modiola, pi. LXXII. 

 figs. 1, 2. 



M. Hneata. Sowerby, Geo. Tr. 2d Ser. IV. p. 338, pi. 14, 

 fig. 2. 



Elongated, ventricose, arcuated ; beaks obtuse ; marsins 

 arched, and nearly parallel ; depth of each valve equal to its 



width; surface covered with fine regular striie, diverging from 

 the beaks to the opposite extremity, crossed by remote lines 

 of growth. 

 The Lower Greensand, near Ilythe. 



21. Modiola bella. — The Neat Modiola, LXXII. fig. 3. 

 M. be/la. Sowerby, Geo. Tr. 2d Series, IV. p. 336, pi. 11, 



fig. 9. 



Ovate, convex ; beaks obtuse ; edges parallel ; surface 

 smooth, with fine distinct striae ; sides nearly equal. 



The Lower Greensand, Ilythe and West of Sussex. 



22. Modiola producta. — The Produced Modiola, pi. 

 LXXIL figs. 11, 12. 



M. producta. Williamson's MSS. and in his Collection. 



Elongated, moderately inflated, somewhat arcuated ; beaks 

 obtuse ; side under the hinge-line much produced ; surface 

 smooth ; lines of growth slightly defined. 



The Coal Shale, Wakefield. 



23. Modiola sub-iruncata. — The Sub-truncated Modiola, 

 pi. LXXII. figs. 15, 16. 



jM. t/racilis. Williamson's MSS. and in his Collection. 



Sub-quadrangular ; beaks hardly protruding ; hinge-line 

 much lengthened, and nearly straight, and obliquely sloping 

 downwards from the extreme angles ; surface smooth. 



The Coal Shale, Wakefield. 



24. Modiola CDRTATA. — The Cut-ofT Modiola, pi. LXXII. 

 figs. 19,20. 



M. Curtata. Williamson's MSS. and in his Collection. 



Oblong ; beaks small and flat ; anterior side short, rounded ; 

 posterior side large, with a considerable expansion above, and 

 the extremity truncated ; surface smooth, with some nearly 

 obsolete lines of growth. 



The Coal Shale, Wakefield. 



25. Modiola flexuosa. — The Flexuous Modiola, pi. 

 LXXII. fig. 18. 



Elongated ; anterior side narrow and short ; beaks obtuse ; 

 basal-lino nearly straight, and lengthened from the anterior side, 

 with a flexure below it ; surface smooth, with remote, shallow- 

 lines of growth ; side below the beaks flexuous on the edge. 



In the Cabinet of Thomas Allis, Esq. York. 



The Marlstono, Gloucestershire, in the lower bed of t!ie 

 Oolitic Series. 



26. JIoDioLA RoBEBTSONi. — Robcrtson's Modiola, pi. 

 LXXII. figs. 24, 25. 



Cabinet of ]^Ir Robertson, Newcastle-on-Tyne. 



Elongated, considerably inflated ; beaks sub-central, very 

 obtuse, and roumled ; hinge-line short, with an expansion near 

 it ; surface smooth, with remote shallow lines of growth. 



The Coal Shale, Newcastle Coal-field. 



27. Modiola reveks.v. — The Reverse Modiola, pi. LXXII. 

 fig. 23. 



M. reecrsa. Sowerby, Geo. Tr. 2d Scries, IV. p. 342. pi. 

 17, fig. 13. 



Transversely elongated, rather compressed ; anterior side 

 narrow, short ; umbones obtuse ; posterior side considerably 

 expanded ; surface with narrow, very regular, concentric 

 ridges, which are reflected upon the surface. 



The Greensand, Blackdown. 



28. JIiiDioLA ilooREl. — Moore's Modiola, pi. LXXII. f. 27. 



M. Moorei. Bro vn, Man. Geo. Tr. I. p. 227, pi. 7, fig. 74. 



