1872.] ETHEEIDGE aXJEENSIAin) FOSSILS. 337 



pressed ; aperture suboval or subangular. "Whorls completely rounded 

 and concentrically striated with nnmerous close- set costae, which are 

 crossed diagonally from the month backwards by very fine lines, 

 giving the shell a reticulate appearance*. Base slightly convex. 

 Umbilicus very small or obsolete. Sinus scarcely distinguishable. 



This shell appears at first sight to be smooth, the ornamentation 

 being microscopic, yet definite ; on a portion only of the shell is there 

 structure remaining. In form, size, and general aspect P. rotunda 

 resembles P. granidata, De Kon. ; but the sculpturing of the shell and 

 the band-like sinus remove it from that species. P. rotundata, PhiU., 

 in the rotundity of the whorls and other minor points, somewhat re- 

 sembles it ; but our species is much less acute in the spire. 



Only one specimen occurs, which is to be regretted. 



Log. Cracow Creek. Form. Carboniferous. 



Naticopsis ? HAEPiEFOEMis, Ether. PI. XYIII. fig. 6. 



Only the body-whorl of this singular little shell is left for our ex- 

 amination, and this only seen in part ; but so rare are these shells in 

 the older rocks that we are glad to recognize and figure the smallest 

 fragment. 



The only shell in the British Palaeozoic rocks approaching this in 

 shape is the Cylindrites (Conus) carhonarius, De Kon. ; but the body- 

 whorl in that species is more attenuated, and the suture appears to 

 have been deeper ; again, we have no lip exposed, so that the aper- 

 ture and canal cannot be examined. The summit of the body-whorl 

 is ornamented with thirty or thirty-five nodes or tubercles, each of 

 which occupies the summit of a rib or varice. The upper whorls are 

 lost ; they must, however, have been very much depressed. This shell 

 bears resemblance to Macroclieilus canalicidatus, M'Coy, and M. ova- 

 lis, M'Coy, especially the former— through both the body- whorl and 

 what must have been the depressed suture to Natica meridionalis, 

 Phil. (Pal. Foss. Dev. and Cornw. t. 36, f. 173), and also Macrochei- 

 lus, Phil. he. cit. t. 39. f. 197. Macroclieilus {Murex) Jiarpula, Sow. 

 (M. C. t. 575. f. 5), has much affinity also with our shell ; again, cer- 

 tain American Loxonemce have 6ocZy-whorls which cannot be dis- 

 tinguished from our specimen. Prof. Morris has suggested that our 

 doubtful fossil may be a small Goniatite, with a wide umbilical cavity, 

 and the ribs passing over the back, each rib bearing a tubercle round 

 the umbilicus. I am still disposed to regard it as the body- whorl of 

 a Gasteropod, or a shell with very depressed whorls hidden in the 

 matrix. 



Loc. Don Eiver. Form. Carboniferous. 



Mtjechisonia caeinata, Ether. PI. XVIII. fig. 5. 



Shell elongated, of many whorls (four exposed), strongly keeled or 

 carinated along the middle of each whorl ; no ornamentation seen, 

 being a cast only. 



Gasteropods appear so rare in these rocks that we venture to figure 

 this in hopes that more perfect examples may be found. 

 * These are seen only near the aperture. 



