﻿164 Proceedings of the Royal Physical Society. 



Cf. Productus leplayi, de Verneuil. 



Productus leplayi, or an allied form, may possibly be repre- 

 sented by a fragmentary pedicle-valve exhibiting the type of 

 ribbing and the scarce spines characteristic of the species. 



? Productus, sp. indet. (2 spp. ?). 

 (Plate VIII. Fig. 12.) 



A few pedicle-valves of a Productoid Brachiopod occur in 

 the collection, but the cardinal region not being available 

 for examination, their true affinities must remain doubtful. 

 These specimens are represented by a globose type, which is 

 figured, and by a flatter one, with less prominent beak 

 (unfortunately not suitable for photographic reproduction). 

 In both the ornamentation consists of numerous fine tubercles, 

 and is strikingly like that of Productus tenuituherculatus, 

 Barbot de Marny.^ 



The shape of the flatter specimens is also very similar to 

 that of Productus tenuitubercidatus, and in the event of the 

 specimens under investigation being proved to belong to the 

 genus Productus, they might with advantage be placed in the 

 same group as the latter species. 



Cf. Strophalosia leplayi, Geinitz. 



(Plate VITI. Fig. 11.) 



This reference to Geinitz's species is not meant to imply 

 anything more than a mere similarity of external appearance, 

 as neither the cardinal region nor the umbo are available in 

 the specimens in question. 



Genera Indeterminable. 



Ehynchonellids appear to be represented by one or two 

 species, the generic position of which cannot be determined 

 in the meantime, through lack of suitable material. 



^ This comparison is based on figures of that species given by Professor 

 Yakovlew, Bull. Com. Geol. Russie, tome xxiv. plate iv. 



