Mr Etlicridgc on Fossils from Bowcn River Coalfield. 289 



occurrence of a shell on the Noyoa Eiver, which was pro- 

 bably a Strophalosia, but may have been only a Produchis.^ 



It now affords me much satisfaction to be able to definitely 

 announce the occurrence of the genus Strophcdosia in the 

 Upper Palaeozoic rocks of Queensland, for, through Mr Jack's 

 exertions, numerous specimens of this genus have been col- 

 lected. These I have provisionally separated into two species. 

 On the one hand there is the shell called by my father Fro- 

 ductus Clarhei, which, on a more complete investigation, turns 

 out to be a Strophalosia. On the other hand are certain 

 other examples, perhaps only a variety of the foregoing, and 

 which may have ultimately to be united with it, but, through 

 the absence of intermediate forms, I have thought it better to 

 keep distinct from S. Clarhei for the present. With the con- 

 currence of Mr T. Davidson, these have been referred to 

 Strophalosia Gerardi (King). 



The British Museum Collection contains another form of 

 Strophalosia from New South Wales and Tasmania. The 

 specimens were presented by the late Professor Jukes and 

 Dr J. Milligan, and Mr Davidson also possesses a few. This 

 form is, in many ways, a remarkable one, agreeing with both 

 the preceding species in some respects, and differing in others. 

 Pending the arrival of further material, I have adopted a 

 similar course in this case, and have provisionally applied to 

 them a name. 



Stroiohalosia Clarhei — Etheridge. — PL IX., figs. 18<x-21 ; PL X., 

 figs. 22-28 ; PL XL, figs. 29-31 ; PL XII., figs. 32, 33. 



Produdus Clarkei, Etheridge, Quart. Jour. Geol. Soc, 1872, xxviii., p. 334, 

 t. 17, f. 2 and 2 a, b. 

 ,, ,, De Koninck, Foss. Pal. Xouv-Galles du Sud., 1877, pt. 3, 



p. 203, t. 10, f. 5, t. 11, f. 2. 

 ,, ,, Etheridge, jun., Cat. Australian Foss., 1878, p. 51. 



S'p. Char. — Ventral valve strongly gibbous, or inflated; 

 very prominent and convex about the visceral region, sloping 

 gradually off to the front, but non-geniculate and unproduced. 

 Hinge line straight, but not equal to the width of the shell. 

 Ears flattened, small when compared with the general pro- 

 * Loc. cit., p. 334. 



