FOSSILS OF THE CARBONIFEROUS LIMESTONES. 293 



"This small shell is very abundant in the shell limestone of Brook- 

 field, Shubenacadie, and in some other localities in Nova Scotia, where 

 it is always associated with Sp. cristatics, of which it may perhaps 

 after all be no more than a modification. 



" Camaro2)]iorla and Rhynchondla. — The specimens referable to 

 these genera sent me by Dr Dawson, as well as those brought to 

 England by Sir C. Lyell, are generally very small, and not in all 

 cases sufficiently complete to warrant a satisfactory determination. 

 I have, however, carefully represented the principal forms. 



Fig. 92 [a], — Cameroiiliorla (ilohulina, Phillips; nat. sirx and magnified ; [b) variety 



of the same. 



" Camarophoria {?) glohullna {?), Phillips (Fig 92, a, h). 



" Terebratula globidina, Phillips, Encycl. Metr., vol. iv., article 

 ' Geology,' pi. 3, fig. 3, 1834. 



" Terebratula rhomboidea, Phillips, Geol. Yorksh., vol. ii., p. 222, 

 pi. 12, figs. 18, 20, 1836. 



" Hemithyris longa, M'Coy, British Pal. Foss., p. 440, pi. 3, D., fig. 

 24, 1855. 



" Of this very small shell I have been able to examine only three 

 specimens ; but it is stated to be abundant in a yellow arenaceous 

 limestone at De Bert River, where, according to Dr Dawson's expe- 

 rience, it is always small. I have also felt somewhat puzzled in the 

 detennlnation of this fossil ; but, after having consulted Professor De 

 Koninck, I concluded to refer the specimens to the same species, not- 

 withstanding the apparent difference they present. Professor De 

 Koninck referred one of them to T. rhomboidea^ Phillips, wdiich is a 

 synonyme of Camarophoria globidina ; and after minutely comparing 

 the Nova-Scotian specimens with the Carboniferous and Permian 

 types, I could perceive no difference sufficient to warrant the ci'eation 

 of a new species. The three specimens were exactly of the same size, 

 namely, three lines in length by three in width, and two and a half in 

 depth. The uncertainty which both Professor De Koninck and myself 

 have experienced refers to a specimen which much resembles, in minia- 

 ture, a form of Rhynchonella acuminata; but when w^e remember 



