PLATE XL. 



Pecten [continued). 



Figs. 



1 — 5. P. (Neithea) quinquecostatus, Sow. (P. 202.) 



1. Cenomanian (Meyer's Bed 12), Dunscombe. Woodwardian Museum. Portion 



between two main ribs of right valve x 6. 



2. Upper Chalk (A. quadratus zone), West Harnham, Salisbury. Dr. Blackmore's 



Collection, a, right valve ; b, anterior view ; c, portion of right valve x 4. 



3. Upper Chalk, probably Sussex. British Museum, No. 74979. Eight valve. 



4. Upper Chalk (? M. cor-anguinum zone), Gravesend. Bristol Museum, a, right 



valve ; b, portion of the same between two main ribs x 4. 



5. Upper Chalk, Sussex. British Museum (Dixon Collection), No. L. 14742. Bight 



valve. 



6, 7. P. (Neithea) quadricostatus, Sow. (P. 210.) 



6. Upper Greensand (Chert Beds), Sutton Veny, Warminster. Woodwardian 



Museum. Posterior half of left valve. 



7. Upper Greensand, Warminster. Woodwardian Museum. Portion of right 



valve x 4. (The line near the middle of each furrow is accidental.) 



9. P. (Neithea) sequicostatus, Lam. (P. 208.) 



8. Upper Greeusand, Worbarrow. Museum of the Geological Society, No. 1530. 



a, right valve x 2 ; b, posterior view of the same x 2. 



9. Upper Greensand (Chert Beds, zone of P. asper), Haldon. Bristol Museum. 



a, right valve ; b, anterior view of the same X 2 ; c, part of anterior ear of 



tlit' same x 4. 



10 — 15. P. (Neithea) sexcostatus, Wootlw. Upper Chalk (.4. quadratus zone), Bast 

 Harnham, Salisbury. Dr. Blackmore's Collection. Right valves, 

 except fig. 12. (P. 214.) 



10 a, x H; 10 b, portion of same X 4 ; 11 a, X 1| ; 11 b, posterior view of the 

 same X 1|; 12, left valve x l.\ ; 13 a, natural size; 13 b, part of posterior 

 view of the same x 2; 14 a, x H; 14- b, outline of the same, posterior 

 aspect, natural size ; 15, natural size. 



