46 Fossils collected at Wollumbilla. 



scales as compared with the number of the teeth, and as no traces 

 of scales exist in any of the specimens, there is a slight improbability 

 of their being really fish teeth. To determine the point, it would 

 be necessary to prepare the specimens as transparent microscopic 

 objects, to be examined for structure by a high power. My present 

 impression is, that they may rather be the teeth-like spinules sur- 

 sounding the edges of the suckers or acetabula of the long pair of 

 arms of the animal enclosing the large Belemnites Barkleyi, the shell 

 of which is found in the same rocks. The only structure which I 

 can see in the present opaque state of the specimens is quite in 

 accordance with this supposition ; but, as before-mentioned, the 

 specimen should be ground thin to exhibit the structure with suffi- 

 cient clearness to determine the point of whether dentine tubes are 

 really present or not. 



42. Lima : most resembling Lias species. 



43. Area : form not characteristic of any geological age. 



44. Nucula, Rhynchronella, and other genera, not characteristic of any 



geological age. 



45. Thick shell, agreeing in most of the generic characters with Modiola, 



but of a new concentrically ridged species. (See 32.) 



46. Lima : most resembling inferior Oolite and Lias species. 



47. Large Pecten, like P. dissimilis, but distinct. 



48. No remark. 



49. Uncertain. 



50. Marked, " Mantuan Downs, (1, 2, and 3)." These fossils are certainly 



of an older epoch, and belong to a totally distinct formation from 

 any of the others sent with them. They are certainly Palaeozoic, 

 and as certainly belonging to the upper part of that series, sug- 

 gesting the existence of the Permian system in Australia from the 

 close resemblance which the fossils marked 1 and 2 bear to the 

 smooth variety of the Producta horrida (called Producta calva by 

 Sowerby), so common in the Magnesian limestone of the north of 

 England, and the affinity of that marked 3 to the Aulosteges or 

 Stropholosia lamellosa, equally common in the Permian Magnesian 

 limestone of England, and the Zechstein of the same age in 

 Germany. 



Frederick M/Coy. 

 14th September, 1861. 



