FOSSILS OF THE CARBONIFEROUS LIMESTONES. 301 



loops of my Carboniferous species and that of Renssdaria. This 

 species is not uncommon in the Windsor limestones at Windsor, where 

 it is usually so preserved as to show the interior with loop. The shell 

 appears to be very fragile, and specimens showing the external char- 

 acters are rare ; at least I do not possess an example. There is a 

 species of Centronella occurring in the Stewiacke limestones at 

 Windsor and Stewiacke which may be identical with this, but I 

 have no good specimens for comparison. 



Centronella, as far as I am aware, has been found only in Devonian 

 rocks. Its occurrence in the Carboniferous limestones of Acadia, with 

 fonns so Permian in character, is very interesting. 



Spirifera striata, Martin, coll. Ilartt, from Windsor. — A ventral 

 valve, 1 ^ inch in breadth, has been found by Mr Hartt in the AVind- 

 sor limestones. It does not appear to differ from specimens of the 

 well-known British ;S'. striata in my collection. It is the largest 

 Spirifer yet found in Nova Scotia, and helps to redeem our Lower 

 Carboniferous shells from the charge of prevailing smallness. 



Crania. — A valve attached to a specimen of Productus cora in the 

 collection of Mr Hartt from Windsor. It is too obscure to be deter- 

 mined or named. 



Lamellibranch iata. 



Modiola Pooli, n. sp. (Fig. 100), coll. J. W. D. and H. Poole, 

 Shubenacadie, Windsor, Irish Cove, C. B. — Tumid, elongate ; nearly 

 cylindrical, but more tumid in front ; surface with delicate lines of 

 growth. 



Fig. 100. — Modiola Pooli [cast). Fig. 101. — Pteronites Gayensis. 



Modiola Avonia, n. sp., coll. Ilartt, Windsor. — A regularly ovate, 

 smooth (?) species, known to me only by casts which abound in bed [d). 



Pteronites Gayensis, n. sp. (Fig. 101), coll. J. W. D., Gay's River, 

 Chester, similar in general form to P. latus, M'Coy. Beaks prominent, 

 pointed ; hinge-line straight, reflected, anterior extremity very short, 

 posterior part flattening and widening with a regular curve to the 

 broad rounded posterior extremity. Surface with rounded concentric 

 wrinkles. 



Bakevellia antiqua, Munst., coll. J. W. D., Gay's River. — A very 

 characteristic and abundant shell, with the last species, and also in the 



