230 



CONCHIFERA. 



Panop^,a. 



Tribe II.— SOLENIDES. 



Sliell transversely elongated, destitute of accessory pieces, 

 and gaping only at the lateral extremities ; ligament external. 



Genus LXVI.—SOLEMYA.—ZamajT^. 



Shell equivalve, inequilateral, transversely oblong, rounded 

 at the extremities ; beaks near the posterior side ; hinge desti- 

 tute of teeth ; ligament partly internal, situate in the margin 

 of an oblique, flattish, posterior rib ; two distant lateral mus- 

 cular impressions. 



1 . SoLEMYA PRiM^vA. — The Primeval Solemya, pi. XCIII. 

 fig. 10. 



S. 2)rim<em. Phillips, Geo. York, II. p. 209, pi. 5, fig. G. 



Transversely oblong oval, compressed, rounded at both 

 sides ; beaks depressed ; surface vrith rather wide radiating 

 striw. 



The Carboniferous Limestone, Heiton ; Lowick and Fer- 

 managh, Ireland." 



Genus LXVII.— PANOP^A.— i»f««arrf. 



Equivalve, oval, inequilateral, gaping unequally at both ex- 

 tremities ; hinge with an acute erect primary tooth in each 

 valve, and a large callosity near the umbones supporting the 

 ligament; two distant, oval, muscular impressions, pallial im- 

 pression with a large sinus ; ligament large, external, adhering 

 to an ample prominent fulcrum. 



1. Panop.ea intermedia. — The Intermediate Panopsaa, 

 pi. XCIII. figs. 14, 15. 



Mya intermedia. Sowerby, VII. p. 4, pi. 602, lb. I. p. 

 7fi, fig. 1, and p. 173, pi. 419, fig. 2. Corhula duhia. Deshayes, 

 Coq. Foss. p. 59, pi. 9, figs. 13, 14. 



Shell ovate, depressed, inequilateral, thin, longitudinally 

 ribbed ; hinge with one cardinal tooth close to the pit of the 

 hinge. 



The London Clay at Reading, Watford, Plumstead, and 

 Bognor. 



2. Panop.s;a gibbosa. — The Gibbous Panopsea, pi. XCIII. 

 fig. 13. 



Mactra gilhosa. Sowerby, I. p. 91, pi. 42. 



Gibbose, transversely elongated, its breadth twice its length, 

 anterior side considerably wider than the posterior, recurved, 

 truncated, and gaping ; posterior side rounded ; length and 

 depth nearly equal ; beaks greatly incurved, and pointed. 



The Portland Stone, Brill, Buckinghamshire ; the Inferior 

 Oolite, near Bath. 



3. Panop^a oblata. — Raised Panopjea, pi. XCIII. fig. 22. 

 Ml/a ffilbosa. Sowerby, V. p. 19, pi. 419, fig. 1. 

 Sub-triangular, gibbose and gaping, posterior side short ; 



anterior side somewhat attenuated, beaks prominent and in- 

 curved ; surface with transverse regular furrows. 

 The Kimmeridge Clay, Osmington, Dorsetshire. 



4. Panop.s:a PLiCATA.^Plicated Panopsea, pi. XCIV. f. 10. 



JV/yn plicata. Sowerby, Y. p. 20, pi. 419, fig. 3. 



Transversely oblong, its width nearly twice its length ; al- 

 most cylindrical, and ventricose ; anterior side truncated and 

 gaping ; posterior side very short, and a little narrowed, beaks 

 rather obtuse ; surface with distinct concentric shallow ridges; 

 which are straight towards the beaks. 



The Upper Greensand, Rowde Hill ; the Gault, Folkstone ; 

 the Lower Greensand, Sandgate, Isle of Wight and Lyme 

 Regis. 



5. Panop^a Norwegica. — The Norwegian Panopa9a, pi. 

 XCIIL figs. 17, 18, 19. 



P. Norwegica. Sowerby, VII. p. 1, pi. 610, figs. 2 and 61 1, 

 figs. 1, 2. 



P. bivonce. Forbes, Mem. Wern. Soc. VIII. p. 94, pi. 

 2, figs. 4, 4. 



Transversely oblong, compressed, thick ; anteriorly shortest 

 and rounded ; posteriorly obliquely truncated above and 

 rounded below ; two longitudinal shallow furrows emanate 

 from the beak, the one near the middle of the posterior side, 

 and the other from the centre of the beaks, terminating on the 

 margins, dividing the valve into three parts; beaks placed on the 

 anterior side ; back and basal lines parallel ; surface with con- 

 centric wrinkles ; muscular impressions deep, pallial impressions 

 large and unconnected with a shallow sinus. 



The Pleistocene Marine Formation, the Clyde and Bute, 

 and the Red Crag, Sutton. 



6. PanopjEa elongata. — The Elongated Panopa?a, pi. 

 XCIIL fig. 16. 



P. elongata. Portlock, Geo. Rep. p. 119, pi. 34, fig. 19. 



Much elongated transversely ; beaks sub-central, obtuse, 

 anterior side shortest ; both extremities rounded, posteriorly a 

 little dilated, an oblique ridge from the beak to the margin, 

 cardinal margin straight ; surface with concentric wrinkles. 



The Portland Oolite, Ballintoy, Ireland. 



7. Panop^a rotund at a. — The Rounded Panopoea, pi. 

 XCIII. figs. 11, 12. 



P. rotundata. Sowerby, Geo. Tr. 2d Ser. IV. p. 338, pi. 

 13, fig. 2. 



Nearly orbicular ; considerably gibbose, beaks obtuse, cen- 

 tral, and approximate, anterior side rounded; posterior side 

 with a short, curved ridge from the beak to the margin, above 

 which it is obliquely truncated, the termination of the beak 

 forming an acute angle ; basal line much arcuated. 



The Lower Greensand, Sandgate. 



8. Panop^a ovalis. — The Oval Panopasa, pi. XCIV. 

 figs. 6, 7. 



P. ovalis. Sowerby, Geo. Tr. 2d Ser. IV. p. 340, pi. 1 6, f. 5. 



Transversely oval ; moderately convex ; beaks situate 

 nearest the anterior side, which is closed ; posterior sides 

 rounded and gaping; surface smooth. 



The Greensand, Blackdown. 



9. Panop^a gentilis. — The Gentle Panopaea. 

 P. gentilis. Sowerby, VII. p. 1, pi. 510. 

 Transversely elongated ; oblong ovate ; sides flattened ; 



posteriorly acuminated ; anteriorly rounded and expanded 

 upwards ; beaks nearly central and inflected ; gaping at both 

 extremities ; width nearly twice the length. 

 In the Red Crag, Alderton. 



