Mr Etheridge on Fossils from Boioen River Coalfield. 283 



that he had recently seen the same structure in some British 

 OrtJiotetes. 



The punctse on the exterior of the shells appear as small 

 rugosities scattered at random over the surface of the ribs or 

 striae and intervening valleys ornamxcnting these shells, but 

 when worn to any extent their perforate character at once 

 becomes apparent. They are in particular very numerous on 

 the area and deltidium. 



These prominent examples of Orthotetes senilis to some 

 extent resemble the variety rohusta (Hall), figured by Mr 

 Davidson from Indian Carboniferous rocks,* only, in the 

 latter, the ventral valve appears wider across the hinge ; the 

 umbo, however, projects upwards and backwards, as in the 

 Queensland examples. 



Log. and Horizon. — Pelican Creek, three-quarters of a mile 

 above Sonoma road-crossing (Marine Series, JSTos. 54 to 57 

 inclusive). Havilah-Byerwin Eoad, one mile south of Eosella 

 Creek crossing. The geological position of this species in the 

 Bowen Eiver coalfield is both interesting and peculiar. 

 According to Mr Jack's notes, it is found at a second locality 

 in a marine band, in his Fresh -Water Series, which is 

 characterised by the predominance of the much-disputed 

 genus Glossopteris, and other so-called Oolitic plants (Nos. 

 190, 194, 212). 



Collector. — E. L. Jack, Esq. 



Genus Productus— /. Sowerhj, 1814. 



(Min. Con., i., p. 153.) 



Productus subquadratus — Morris (?). 



P. suhquculratus, Morris, Strzelecki's "Pliys. Descrip. N. S. Wales," etc., 

 1845, p. 284. 

 ,, De Koninck, Mon. Productus et Chonetes, 1847, p. 100, 



t. 14, f. 1. 

 ,, Etheridge, jun.. Cat. Australian Fossils, 1878, p. 53. 



Ohs. — A single, large, quadrate, and gibbous cast of the 

 exterior of the united valves of an individual appears from 

 the arrangement of the spines and general appearance to be 

 * Quart. Jour. Geol. Soc, xviii., p. 30, t. 1, f. 16. 



