the cambridge gault and greensand. 301 



Brachiopoda. 

 Terebratula biplicata, Sow. (non Brocchi). 



Terebratala biplicata, Sow. ; Davidson, Cret. Brach. p. 55. pi. 6. 

 T. Dutempleana, D'Orb. Pal. Er. iv. p. 93, pi. 511. f. 1-8 ; Pict. 

 & Boux, pi. 51. f. 1-4. 



The varieties figured by Mr. Davidson as Dutempleana and obtusa 

 are very common near Cambridge, though. I have also seen deeply 

 plicated forms which closely approach the typical T. biplicata. The 

 casts are sometimes dark, but more often of a lighter buff colour 

 and preserving the shell ; many of these specimens probably come 

 from the sandy beds at the top of the Gault, though some belong to 

 the Chalk-marl itself. T. Dutempleana is not unfrequent in the 

 Upper Gault of Folkestone, but has never been found below Bed VII. 

 of Mr. Price's section. 



The three forms above mentioned are indicated by M. Eenevier 

 as occurring in the Vraconnian at Cheville ; and, lastly, they are 

 common in the " Gault friable " at Esa near Nice, where they occur 

 in the same phosphatic condition as at Cambridge. 



Rhynchonella sulcata, Park. 



Rhynchonella sulcata, Park. Geol. Trans, vol. v. p. 59 ; Davidson, 

 Cret. Brach. pi. 10. f. 18-36. 



Rhynchonella Emeriti, Pict. & Boux (non D'Orb.), pi. 50. f. 6. 



This species, which is so common at Cambridge in the same state 

 of preservation as Terebratula biplicata, has never yet been found for 

 certain in the English Gault or Upper Greensand ; it is, however, 

 moderately abundant in the Vraconnian or " Gault superieur " of 

 Cheville, but is not known at Ste. -Croix ; Mr. Davidson, again, has 

 collected it at Esa in the same bed with Terebratula biplicata and 

 Kingena lima. Rhynchonella sulcata therefore appears to have been a 

 species of very partial distribution, having perhaps existed in colonies 

 where conditions were favourable to it. 



Bhynchonella latissima (J. Sow.), Dav. 



Rhynchonella latissima, Davidson, Cret. Brach. xi. f. 6-22. 

 Rhynchonella lata, Pict. & Boux, p. 530, pi. 50. f. 3, 4. 



Casts of a similar type to the "Warminster shells are occasionally 

 found in the nodule-bed, always in brown phosphate, but are by 

 no means common. They occur likewise at Cheville and La Perte 

 du Bhone. They would seem here to have lived in the Upper Gault 

 period. 



Bhynchonella compressa, Lam. 

 Rhynchonella compressa, Lam. 

 1-6 . Darw. Cret. Brach. xi. f 



Of this species, which is much wider (!) than the accredited " latis- 



Rhynchonella compressa, Lam. ; D'Orb. Pal. Pr. iv. p. 35, pi. 497. 

 f. 1-6 . Darw. Cret. Brach. xi. f. 1-5. 



