158 



CONOHIFEEA. 



LiM/ 



Oblong oval, rather inflated ; sides nearly straight half their 

 distance from the beaks; ears unequal and small ; surface with 

 many smooth, sharp, divergent ribs, wliich become more 

 numerous towards the margins by intervening ones. 



The Greensand, Blackdown. 



67. Pecten Stutchburiensis. — Stutchbury's Pecten, pi. 

 LXV. fig. 1. 



P. Stutchburiensis. Sowerby, Geo. Trans. 2d Ser. IV. p. 

 342, pi. 18, fig. 1. 



Sub-triangular, elongated, compressed, with upwards of 

 sixty irregularly larger and smaller, close-set, scaly ribs ; the 

 intervening furrows with oblique stria;. 



The Greensand, Blackdown. 



68. Pecten islandicus. — The Islandic Pecten. 



P. islandicus. Brown, Recent Conch. Brit. p. 72, pi. 2-1', 

 fig. 3. 



Rather elongated, ears unequal, the larger one with oblique 

 ribs, crossed by concentric stri;e ; surface with numerous flat, 

 divergent, irregularly grouped, rough ribs, varying from seventy 

 to one hundred, ami which appear internally ; the intervening 

 furrows are reticulated. 



The Pleistocene Marino Formation, Dalmuir and Ardincaple, 

 Renfrewshire, Bute, and Ayrshire. 



69. Pecten sinuosus. — The Distorted Pecten. 



P. sinuosus. Brown, Recent Conch. Brit. p. 73, pi. 24, f. 4. 



Sub-orbicular, variously distorted, one valve convex, and tho 

 other rather flat ; irregularly and longitudinally ribbed, which 

 in some shoot into foliations and spines ; ears unequal, the 

 larger one foliated. 



The Pleistocene Marine Formation, Ireland, and Dalmuir, 

 Renfrewshire. 



70. Pecte.v vabius. — The Variable Pecten. 



P. variiis. Brown, Recent Conch. Brit. p. 72, pi. 24, f. 4. 



Oblong, nearly equivalve, with from twenty-six to thirty 

 acute, divergent, spined ribs ; the intervening furrows finely 

 reticulated. 



The Pleistocene Marine Formation, Dalmuir, Renfrew- 

 shire, and Ayr. 



71. Pecten subulatds. — The Elongated Pecten, pi. 

 LXI.* figs. 24, 25. 



P. suhulatus. Goldfuss, pi. 98, fig. 12. Portlock, Geo. 

 Rep. p. 128. 



Somewhat elongated, large and subovate ; hinge-line straight, 

 ears unequal, one very small, the other large, with a hiatus at 

 its lower angle in the deep valve; whole surface of the upper 

 valve with very slightly raised longitudinal ribs, which, as well 

 as the intervening furrows, are crossed by extremely minute 

 undulating, concentric striie, quite invisible except by the aid 

 of a lens ; lower valve smooth; 

 The Oolite, Magilligan, Ireland. 



72. Pecten tbxtilis. — The Woven Pecten, pi. LXI.* 

 figs. 30, 31. 



P. textilis. Goldfuss, pi. 89, fig. 3. Portlock, Geo. Rep. 

 p. 129. 



Orbicular, hinge-line oblique, ears nearly equal and obtuse ; 

 deeper valve with numerous narrow, radiating ribs, with wide 

 intervening furrows, crossed by fine concentric strias ; upper 

 valve nearly flat, with close-set radiating striae, crossed by 

 numerous exceedingly fine concentric striae, giving the 



surface a fine embroidered appearance ; margin slightly cre- 

 nated. 



The Oolite, Magilligan, Ireland. 



Genus ^^lll.—LUiX.—Bruguiere. 

 Shell longitudinal, equivalve, inequilateral ; sides somewhat 

 thickened and gaping ; umbones divergent, their internal 

 facets inclined outwards ; hinge provided with two lateral teeth 

 one on each side in both valves, which become nearly obsolete 

 in adult shells ; area between the beaks, to which tho ligament 

 is attached, divided ; tripartite ; tho middle or hinge pit is 

 rounded above, and contains the chief portion of the ligament, 

 the remaining portions are attached to the somewhat elongated 

 linear divisions ; muscular impression lateral, sub-orbicular, 

 from the inuer margin of which the muscular impression of the 

 mantle emanates, and, traversing the other side of the valves 

 in a circuitous form, appears to terminate near the beak ; ex- 

 ternal surface covered with a very thin epidermis. 



1. Li.MA GiBBosA. — The Gibboso Lima, pi. LXVII. figs. 8, 9. 

 L. gibhosa. Sowerby, II. p. 120, pi. 152. 



Elongated, gibbose, slightly oblique, nearly twice as long as 

 wide ; cars undefined ; surface smooth, with a series of radiat- 

 ing furrows in, the centre of the valves. 



The greatest depth of the shell is near the beaks, whore it is 

 nearly as deep as wide. 



The Inferior Oolite, Cotswold and Dundry. 



2. Li.MA probo.scidea. — The Proboscis Lima, pi. LXVII. 

 fig. 20. 



L. proboscidea. Sowerby, III. p. 115, pi. 244. 



Sub-ovate, hardly oblique, broad, convex; ears small ; sur- 

 face with about twelve elevated, rounded ribs, each furnished 

 with several large tubular processes, with a funnel-shaped 

 termination ; variously bent and pressed to the surface. 



The Inferior Oolite, Weymouth ; Glaizedale, and Antrim, 

 Ireland. 



3. Lima rudis. — The Rugged Lima, pi. LXVII. fig. 11. 

 L. rudis. Sowerby, III. p. 25, pi. 214, fig. 1. 

 Obovate, oblique, inflated, somewhat longer than wide ; 



anterior ear open, with thickened lobes; the other small, with 

 thick inflated edges to the valves ; surface with about seven 

 large, convex, rugged, longitudinal ribs ; edges of valves thick 

 and reflected. 



The Middle Oolite, Yorkshire and Wiltshire. 



4. Lima antiquata. — The Antiquated Lima, pi. LXVII.f.7. 

 L. antiquata. Sowerby, III. p. 25, pi. 214, fig. 2. 

 Elliptical, depressed ; anterior ear deeply wrinkled and 



open ; smaller ear striated ; surface with numerous coarse, 

 longitudinal, irregular strise. 



The Lias, Weston ; Frethern, Vale of Evesham, and Glou- 

 cestershire. 



5. Lima sub-ovalis. — The Sub-oval Lima, pi. LXVII. 

 figs. 3, 4. _ 



L. suh-ovalis. Sowerby, Geo. Trans. 2d Series, IV. p. 342, 

 pi. 17, fig. 21. 



Somewhat quadrangular, elongated, with very numerous, 

 divergent, rounded ribs, each of which is furnished with rather 

 distant, regularly-set, obtuse scales ; the intervening furrows 

 equal in breadth to the ribs. 



The Greensand, Blackdown. 



