352 BRACHIOPODA OP THE 



Obs. — Internal casts of the ventral valve were well described and figured by Mr. 

 Salter, but incorrectly identified by him as a Leptana, while its external and internal 

 characters show it to be a Productus. In his description he says : " I know no Silurian 

 species, except the small L. quadrat a, of Russia, and L. tenuicincta, of Britain, which 

 resembles this in form. Both are much smaller and less gibbous." The Budleigh 

 specimens, however, do not resemble the Russian species above referred to, nor do they 

 belong to the same genus. 



Mr. W. Linford has recently found an impression of the exterior of the ventral valve 

 of the shell under description, in which the hollows left by the spines are preserved (fig. 

 14). Productus Vicaryi, in the shape and character of its spines so nearly resembles 

 Productus subaculeatus that it is very possible that it may be hereafter necessary to refer 

 the Budleigh-Salterton specimens to that species. 



Productus Vicaryi is not very rare in the quartzite pebbles at Budleigh-Salterton, 

 and is found associated with Spirifera Vemeuilii, Rh. inaurita, and Streptorhynchus 

 crenistria, as well as with other well-known Devonian species. 



29. Chonetes, sp.? Dav., B. S. Sup., PI. XXXIX, figs. 12, 13. 



Chonetes, sp., Bav. Quart. Journ. Geol. Soc, vol. xxvi, p. 87, pi. vi, fig. 13, 1869. 



Of this small species of Chonetes several specimens have been met with by Messrs. 

 Edgell and Vicary in one or two pebbles, associated with RhynchoneMa inaurita. It is 

 no doubt of Devonian age. As the exterior has not been discovered, it would not be 

 safe to refer it to any of the described species. The casts are marginally semicircular ; 

 hinge-line straight, with acute, slightly projecting cardinal angles ; ventral valve evenly 

 convex. 



Length 3, width 4 lines. 



In external shape it resembles some Devonian casts of C. Hardrcnsis ; but, it is 

 a smaller shell. 



30. Crania transversa, Dav. B. S. Sup., PI. XL, figs. 9, 10. 



Ceania transveusa, Bav. Quart. Journ. Geol. Soc, vol. xxvi, pi. iv, figs. !), 10, 18G9. 



Shell oblong-oval, widest anteriorly ; upper valve moderately convex ; ventral valve 

 about one third the length of the shell from the posterior margin ; surface smooth or 

 marked by concentric lines of growth. 

 Length 6, width 7 lines. 



