LOWER CARBONIFEROUS FOSSILS. 



285 



Coiiularia, Strophomena, Zaphrentis, etc., either not found, or rarely 

 found, liigher than the Lower Carboniferous in other countries. 



It is a matter of regret to me that I have not had time fully to 

 investigate all the facts bearing on this curious question. I would 

 commend it to those who may follow me, to whom that Avhich I have 

 been able to do may at least be of service in guiding their researches. 



Descriptive List of Fossils of the Carboniferous Limestone. 



Protozoa. 



Dentcdina priscilla, n. sp. (Fig. 82), coll. Hartt, Windsor. — Shell 

 fomied of several elongated or short cells, se^iarated from each other 

 externally only by slight constrictions; diameter about l-40th of an 

 inch. This little shell is very abundant on the surfaces of bed (6), 

 Windsor, but always in fragments. I do not feel at all certain as to 

 its affinities, more especially as in the longitudinal section it does not 

 show true septal plates, but only slight constrictions at the nodes. 



Fig. 82. — Dentalina ; nat. size and magnified. Fig. 83. — Lithostrotion Pictoense. 



Longitudinal and Transverse 

 Sections. 



Radiata. 



Lithostrotion Pictoense, Billings (Fig. 83), coll. J. W. D., East River, 

 Pictou. — This fine coral is characteristic of a thick bed of limestone 

 at Lime Brook, East River. The following description has been 

 kindly prepared by Mr Billings : — 



" Corallum fosciculate, dendroid. The corallites are elongate, cylin- 

 dro-turbinatc, the young individuals springing from the sides of the 

 adult at various heights, rapidly attaining the full size ; at first slightly 

 divergent, then parallel, and usually in contact with each other, or 

 nearly so. They seem to be covered by a thin compact epitheca, and 



