42 



Gasteropoda. 



Genus Lophospira, Whitfield. 



(Bull. Am. Mas. Nat. Hist, 1886, I., No. 8, p. 312.) 

 PI., Fig. 24. 



Obs. — It is with some hesitation that 1 refer tlie impres- 

 sion of a fragmentary univalve to this genus, characteristic 

 of the Trenton Limestone of North America, and the 

 Wenlock Limestone of the Island of Gotland. By taking 

 a cast of the impression we see the remains of a turreted 

 shell, with sharply carinated whorls, and generally pre- 

 senting a bold and somewhat rugged appearance. There 

 are portions of four whorls, each divided almost in the 

 centre by a strong and sharp carina, the surface of each 

 whorl above it being more or less concave, and below 

 nearly straight walled. Our cast corresponds better with 

 Lindstrcim's figure of Z. hicincta. Hall, sp.\ than it does 

 with Whitfield's types. Whatever may be t\\% ultimate 

 resting-place of the former, I think the Tasmanian cast 

 will be found congeneric, although sufficient of the body 

 whorl is not preserved to show the second or lower keel. 

 All trace of sculpture has been removed. 



There is no more evidence in our specimen than there 

 is in Lindstrom's figure of the ultimate uncoihng of the 

 whorls described by Whitfield as typical of his genus, and 

 it is just possible therefore that the Gotland shells called 

 L, bicincta, Hall, sp., by Lindstrom, may not be that 

 species. 



Loc. — Zeehan, in a white quartzite. 



Genus Murchisonia, D\irchiac and De Verneuil. 



(Bull. Soc. Geol. France, 1841, XII., p. 154.) 



PL, Fig. 23. 



Obs. — This genus is represented by the elongated cast 

 of a turreted-pyramidal shell, slowly increasing in size. 

 There are five whorls (as preserved), almost straight sided, 

 and swollen near the sutures, caused by a slight projection 

 of the wide and apparently flat band, which on the upper 

 whorls is situated at that point, but on the body whorl 

 forms its periphery. 



* Pleurotomaria. Sil. Gastropoda and Pteropoda of Gotland, 1884, p. 104, 

 t. 8, f. 15-35. 



