114 



two anterior, one oblique and lamellar and one more tubercle, 

 the whole anterior, ventral margin finely crenulated. Trans- 

 verse, Long. 22, Lat. 18. Thickness of both valves 17. 



This fossil is very completely removed from any known 

 existing Australian form, being more globose, more finely 

 striate ; and the peculiar crenulation of the margin which ex- 

 tends under the lunule. I am not acquainted with any fossil 

 form near it as far as my acquaintance with the European 

 Miocene and Eocene extends. It must be admitted, however, 

 that the points of distinction in shells whei'e there is so much 

 general resemblance, as in this genus,can fecarcely be made out 

 without the closest attention to details and comparison of 

 specimens. The dcsci-iptions by most ordinary writers on 

 palaeontology are quite insufl&cient. 



Chama lamellipera. n s. Shell somewhat small, thick- 

 ish, globose, angularly orbicular, very inequivalve, and ad- 

 herent. The whole surface of both valves covered with close 

 thin irregular lamella;, which, though sometimes projecting 

 slightly, never become much produced or spiny, in the grooves 

 between fine and smaller ridges can be seen ; left valve very 

 convex, attached anteriorally where it is sharply angled and 

 flattened ; umbones small and very much incurved, making 

 almost a spiral whorl ; hinge linear and curved with a broad 

 flat concave linear fossette under the dorsal curve, right valve 

 solid, very convex (but less so than the left valve) with an 

 incurved sloping prominent umbo. Largest specimens about 

 lat. 24 by 22 and 18 mill, thick. 



In the absence of radiating stpise the non-spinous or pro- 

 duced lamellse, and the size, all this species differs from the 

 known fossil Chamse. It is very abundant in the beds. 



Besides the foregoing fossils I have provisionally named the 

 following not being able to publish a more extended diagnosis 

 because of the imperfect state of the specimens. 



A small smooth Pyramidella, JPijramidella rolertl, mihi, 

 with perfectly flattened smooth whorls, 12 in number ; the 

 apex of 3 round smooth turns ; the aperture subquadrate ; 

 base of columella everted. Long. G^, Lat. 2 mill. 



RissoiNA TATEANA. Aluiost turbinate, numerous oblique 

 solid ribs on upper whorls ; lower whorl almost smooth ; outer 

 lip varicose. 1 mil. Lat. ; Long. (?), (decollated.) 



GiBULA cLARKEi. U.S. A turbinated multicarinate shell, 

 obliquely, regularly, and finely Urate, where they cross the 

 carinas, making the latter almost granular ; whorls 6 ; flat- 

 tened and broadly canaliculate at the suture ; base flat or 

 convex, grooved, deeply uiubilicate, obliquely striate within, 



