86 THE DEACHIOPODA. 



1878. Ehynchonella plicatella, Dav., British Fossil Bracli. 

 Palajont. Soc, Supplement, plate xxvii., 

 figs. 4-7. 



1881. ,, PLICATELLA, Szajnoclia, Ein Beitrag zur 



Kenntniss der jurass. Brachiopoden, page 

 14. 



This species is easily distinguished by the space on the sides 

 of the beak, and its fine ribs. The original specimen figured by 

 Sowerby was from Dorset, being from Chideock, near Bridport . 

 "When young this species is much elongated. Generally the 

 mesial fold is only slightly and gradually elevated, but in some 

 specimens, especially from the Humphriosianum zone, it is 

 distinctly and sharply raised, a good sized specimen containing 

 about 13 ribs on this fold. 



Dimensions.— IjQngih., 17; breadth, 15; depth, 10 lines. In 

 some specimens the dorsal valve is much more convex. 



Localities. — Bradford Abbas, Clifton Maybank, &c. (Dorset), 

 Haselbury, &c. (Somerset), also Dundry and Dinnington ; and 

 Moutiers and Bayeux (France), and in Siebungen, and in 

 Portugal. 



35. — Ehynchonella subangulata, Davidson. 



1877. Ehynchonella subangulata, Davidson, Proceedings of 



Dorset Field Club, Vol. I., plate iv., figs. 

 11 and 12. 



1878. ,, SUBANGULATA, Duvidson, British Brach. 



Palfeont. Soc, Jurassic, Supplement, 

 plate xxix., fig. 14-16. 



This is a good and easily-defined species, and certainly quite 

 distinct from Sowerby's Rhynch. angulata, which is much more 

 allied to Rhynch. suUetrahedra, while this partakes more of the 

 characters of Rhynch. cynocephala on account of its very raised 

 mesial fold, containing 5 or 6 sharp ribs. This species occurs 



