FUI.TOX : 1. 1ST OF SPHOEROSPIRA SECTION' OF THERSITES. 5 



The types of yiilei and rainhirdi are extreme forms, the type of yulei being 

 a small lii^ht-coloured, and depressed form, whilst the type of rainhirdi is 

 large, globose, and darker-coloured ; the very large series before me closely 

 connects these two forms. 



The broadly-expanded, dark-brown peristome and excavated umljilicus, 

 differentiates this form from its allies. 



Group of frazeri. 



6.— T. frazeri, Gray. 

 Zool. Beechey's \g)\ Moll, 1839, p. 143, pi. 38, fig. 6. 



= mossmani, Braz. : P.Z.S., 1875, p. 33, pi. 4, fig. 6. 



Lor. — New South Wales and Queensland. 

 This species varies greatly in size and coloration ; a specimen before me is 

 of a light yellowish-brown with only one colour band, situated at the suture 

 of the lower whorls ; another has an additional one at the periphery of the 

 last whorl, whilst others are nearly covered with dark brown spiral bands. 

 The colour of the peristome varies from black to a light bluish-grey. 



Some ot the larger forms approach infornns, Mouss., but the latter can 

 be readily separated by its higher spire and more rapidly increasing whorls. 



The shell described as mossraani is a rather globose form of frazeri 

 with a black peristome ; the original figure is misleading, being much 

 higher in proportion to width, according to the dimensions given in the 

 description. 



T. frazeri v. flavescens, Hedley. 



I have not seen this remarkable variety said to be " of a uniform light 

 yellow, lip pure white." 



Lor. — Corumbui Creek, Queensland. 



7.— T. rawnesleyi. Cox. 

 P.ZS., 1873. p. 564 pi. 48, fig. 2. 

 Lor. — Mt. Elliott, Queensland 



A heavy form of a uniform dark brown, with a thick and broadly 

 expanded peristome. 



T. rawnesleyi v. mazee, Bra/. 

 Proc. Linn. Soc. N S.W.. 1878 (iii), p. 79. pi. 8, fig. 5. 

 Zor. — Rockingham Bay, Queensland. 

 From typical ravnedeyi this differs chiefly in coloration, having numerous 

 dark-brown spiral bands upon a light yellowish-brown ground : it varies 

 greatly in size and resembles frai^eri, but can be separated by the thicker 

 [)eristome and smaller aperture. 



All the fraseri group have the microscopic waved striation, although it 

 is almost obsolete in some specimens. 



In fra.teri there are generally on the middle whorls more or less con- 

 spicuous (under a strong lens) microscopic spiral impressed lines, which I 

 have not seen on specimens of mazpe. 



