296 



THE CARBONIFEROUS SYSTEM. 



Scotia by Sir C. Lyell, and now in the Society's Museum, I found a 

 well-characterized example of this species, which in Sir C. Lyell's 

 list had been confounded with Productus Martini. 



Fig. 95. — Strophomena analoga, Phillips. 



Fig. 96. — Streptorhynchus crenistria, 

 Phillips, and sculpture magnified. 



" Streptorhynchus crenistria, Phillips (Fig. 96). 



" Several crushed valves, referable to this species, occur on a speci- 

 men of Carboniferous shale from East River, Pictou,* for which I am 

 indebted to Dr Dawson. These valves exactly resemble certain small 

 specimens found in several British Carboniferous shales. Their 

 surfaces are covered with numerous radiating raised striae, with a 

 smaller rib between the larger ones, the whole being closely intersected 

 by fine concentric lines, thus giving to the longitudinal ribs a 

 crenulated appearance. Professor De Koninck coincides in my 

 identification. 



" Productus. — Although Sir C. Lyell and Dr Dawson mention seven 

 species of this genus as having been found in the Lower Carboniferous 

 rocks of Nova Scotia, all these, as well as the specimens I have been 

 able to examine, can be referred to two species only, namely, P. semi- 

 reticidatus and P. cora ; and I may mention that Prof. De Koninck 

 coincides in this view. 



" Productus semireticulatus, Martin (Fig. 97). 



u Anomites semireticidatus, Martin, Petrif. Derb., pi. 32, figs. 1, 2, and 

 pi. 33, fig. 4, 1809. 



" This species is so well known that all I shall require to state is, 

 that the Nova-Scotian specimens are exactly similar to those found in 

 Europe. Producta Martini, P. concinna, P. antiquata, P. Scotica, 

 mentioned by Sir C. Lyell at p. 220 (vol. ii.) of his 'Travels in 

 America,' as well as by Dr Dawson in various pages of his ' Acadian 

 Geology,' belong to a single species, namely, Productus semireticidatus, 

 Sow. The ' P. spinosa, Sow. (?) var. of P. Martini,' of Sir C. Lyell's 

 * The locality is incorrectly given Shubenacadie in the paper quoted. 



