246 PROF. E. FORBES ON LOWER GREENSAND FOSSILS. 



57. Area securis (Cucullcea sp.) Leym. pi. 7. f. 6. (and 7.) 

 Loc. Atherfield. The British specimens belong to the variety 



" A. major " of M. Leymerie. 



58. Area Dupiniana D'Orb. T. C. pi. 310. f. 9, 10. 



Loc. Peasemarsh. Excellently represented in the "Paleonto- 

 logie Francaise." 



59. Area Carteroni D'Orb. T. C. pi. 309. f. 4. 

 Loc. Peasemarsh, Atherfield. 



60. Area Cornueliana D'Orb. T. C. pi. 311. f. 1, 2, 3. 



Loc. Atherfield, Earlstoke, Pulborough, Hythe, Peasemarsh, 

 Reigate. 



Note. This species, which is very common in the Lower Greensand, has 

 hitherto been confounded with the u Cucullcea glabra " of Parkinson and the 

 Mineral Conchology, from Blackdown, which is certainly only the young of 

 Area ( Cucullcea) fibrosa. 



61. Gervillia aviculoides Sow. M. C. t. 511. 



Loc. Atherfield, Pulborough. 



Var. f3. Valves very unequal. Gervillia anceps Desh. in Leym. 

 pi. 10. f. 3. ? 



Loc. Peasemarsh. 



62. Gervillia solenoides Defrance. (Sow. M. C. t. 510. f. 1 — 4.) 

 Loc. Shanklin. 



63. Gervillia linguloides. Sp. nov. PI. 3. f. 9. 



Gr. testa triangulari-lanceolata, obliqua, alata, carinata, con- 

 centrice substriata, margine cardinali recto, margine frontali 

 abrupte truncato ; umbonibus acutis, terminalibus. 



Lon. 0^ ; lat. |i unc. 



Shell triangularly lanceolate, very oblique, angularly carinate, 

 with one side very abrupt and the other sloping, truncate at the 

 extremity. Surface finely striated concentrically, or nearly smooth. 

 Beaks terminal. Hinge resembling that of Gervillia aviculoides, 

 the ligamental sulcations few and distant. A very remarkable shell 

 resembling many Avicidce in form. 



Loc. Abundant and gregarious in the Cracker bed at Atherfield. 



64. Perna alceformis Sow. M. C. t. 251. 

 Loc. Atherfield, Culver, Hythe. 



Note. The young shell is marked with strong radiating ribs, and is apt to 

 be mistaken for an Avicula. 



65. Perna Mulleti Desh. in Leym. pi. 11. f. 1, 2, 3. 

 Loc. Peasemarsh, Reigate, Atherfield. 



Note. On account of the importance of this fine species, figures of British 

 specimens are given in Plate 1., showing it in a much more complete state than 

 it has hitherto been represented. Fig. ]. is the exterior of the upper valve : 

 j. 2. represents the hinge and interior : figs. 3. and 4. stages of growth. 



