334 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 24, 



This common and widely spread shell is the most variable of the 

 Producti, and seldom attains a larger size than our specimen, which 

 is a cast of the interior of the dorsal valve. It is known in the Car- 

 boniferons Limestone of the Punjaub in India, Carro Creek in Tas- 

 mania, Bolivia, Kussia, and Belgium, and everywhere in Britain ; we 

 now, for the first time, record it from Queensland. 



Loc. Don River. Form. Carboniferous. 



Pboductits Clarkei, Ether. Plate XYII. figs. 2, 2 a, 2 h. 



Shell ovate, nearly as wide as long, hinge -line short, cardinal 

 angles rounded ; the beak appears to have been moderately developed ; 

 the small or dorsal valve nearly flat, and following the course of the 

 ventral.valve, which is convex, or gibbous ; beak, or umbo, moderately 

 developed, incurved ; surface of shell covered with fine vertical wavy 

 lines, projecting from which are numerous slender spines. 



Ohs. Afiinities : — The ventral valve of this shell much resembles 

 in shape certain forms of P. scalenoides ; but the dorsal valve in our 

 species is much flatter than in P. scalenoides, or, indeed, any other 

 known Productus. The flat or dorsal valve is furrowed by numerous 

 concentric lines of growth, which apparently possessed spines, points 

 of attachment for which still remain. 



Externally our shell is also allied to P. muricatus, Phill., but is 

 much larger ; and many forms of P. Toungianus may at first sight be 

 mistaken for it ; the latter shell, however, is deeper, and the umbo 

 more incurved than in P. GlarTcei. 



Loc. Bowen River. Form. Carboniferous. 



No one on the Australian continent has done so much to further 

 our knowledge of its physical structure as the Rev. "W". B. Clarke, 

 M.A., F.G.S., &c. ; to him both colonists and geologists are deeply 

 indebted for the patient and determined labour with which he has 

 worked out the auriferous deposits and fossil contents of the Aus- 

 tralian rocks. I therefore associate his name with this shell, which 

 seems abundant. 



Pkoductits or Strophalosia. PI. XVIII. figs. 4, 4 a. 



I am in doubt about assigning even the generic name to this sheU, 

 That it belongs to the Productidae is evident ; but whether to the 

 genus Productus or StropTicdosia it is difiicult to determine. We 

 have the dorsal and ventral valves of two difi'erent individuals ; but 

 none of the outer shell remains, only some of the inner pearly con- 

 centric coats. The dorsal valve resembles that of P. scahriculus, 

 especially in the peculiar arrangement of its spines. It occurs in a 

 pale grey limestone composed chiefly of the crowded and broken 

 remains of the species. 



Loc. "Weelwandangela Creek, lYoyoa River. Form. Carboniferous. 



Spikifeea striata (Martin). PI. XVII. fig. 5. 



Ref. Pet. Derb. t. 23 ; Dav. Mon. Carb. Brach., Pal. Soc. p. 19, 

 t. 2. figs. 12-21, t. 3. figs. 2-6. 



This shell has all the characters of our common British species. 



