208 PROF. REYNOLDS AND MR. VAUGHAN ON THE [May I904, 



in Cardium rliceticum). The concentric growth-lines are also well- 

 marked, and produce, in crossing- the ribs, the facetted type of 

 ornament ; a few of the growth-lines are much stronger than the 

 others (producing the frill-type of ornament). 



The species is figured by Quenstedt (2), and by Oppel & Suess (8). 

 It seems impossible to include this form under Cardita Heberti, 

 Terq., as has been done by Brauns (5), pp. 326-27. 



This is the commonest species at Sodbury, and ranges from the 

 base of the Avicula-bed up into the Esiheria-\)e&. 



Cardium rh.eticum, Merian. 



The specimens are usually large (22 millimetres along the first 

 radial rib). 



The hinder part of the valve is bent along a radial fold, and the 

 area thus formed is concave ; but there is never a ridge at the fold. 

 There are three or four ribs in front of the fold. The ribs are broad 

 and flat, and are separated by linear grooves. 



Yery common in the main Pecten-bed. 



Schizodus Ewaldi, Boriiemann ( = Acinus cloaeinus, Moore). 

 Especially common in the main Avicula-bed. 



(b) Vertebrata, with Notes on the Position of the Bone-Bed. 



By S. H. R. 



The vertebrate fauna of the Rhgetic Bone-Bed of the Chipping- 

 Sodbury section is rich and varied, nearly as rich as that of Aust, 

 which it much resembles. The following species were met with, 

 the nomenclature adopted being that of Dr. Smith Woodward & 

 Mr. Sherborn. 1 



Reftilia. 



Plesiosaui'us costatus, Owen. — Teeth and vertebral centra occur 

 occasionally, but are not so plentiful as at Aust. 



Mysosteus Oweni, Owen. — Small, presumably reptilian, vertebras 

 with the characters to which Owen applied the above name are not 

 uncommon. Mr. Montagu Browne 2 notes that, in certain respects, 

 these vertebras have amphibian affinities. 



Coprolites and broken undeterminable bones are very common. 



Amphibia. 



? Metoposaurus diagnosticus, Meyer. — This species, which is well- 

 known from Aust, might be expected to occur at Sodbury, but its 

 occurrence can hardly be said to be clearly established. A 



1 ' Catalogue of British Fossil Vertebrata ' 1890. 

 - Eep. Brit. Assoc. 1894 (Oxford) p. 658. 



