FULTON : LIST OF SPHOEROSPIRA SFXTION OF THERSITKS. 3 



Types of incei and appemJindaia in British Museum. 



Compared with the type of incei, typical cqjpendicidafa is a little flatter 

 in form, thatclvri a little broader, liilli smaller and more conical : jolrmionpi 

 same form as MUi, but larger ; hayensis is simply a thicker f(jrm of 

 apppJidindata, pmeferrnissi is the lighter coloured variety with no circum- 

 umbilical brown patch, but that character is not constant. 



I have not seen a speciman of rha/Iisi, but judging from the descrip- 

 tion and figure, it is evidently almost identical with typical ineci. 



The foregoing comparisons are made from typical specimens, but they 

 are closely linked together by intermediate forms, proving that they belong 

 U) one species. 



Pilsbry, in Tryon's Manual of the Mollusca, vol. vi, p. 167, had 



evidently not a typical specimen of incei before him, but rather one of the 



varieties, as he distinguishes it by the absence of the brown circum-umbilical 



patch, a character that is present in the t)pe specimen of incei. 



T. ineei v. yepponensls, C. E. Beddome. 



Proc. Linn. Soc. N.S.W., 1897, vol. xxii, p. 123. figd. 



Loc — Yeppon, near Rockhampton, Queensland. 



A lighter-coloured shell, and with the umbilicus more excavately open 

 than in typical incei. 



2-T. lessoni, Pti. 



Pfr. Sym., 1S46, iii, p. 71; Reeve: Con. Icon., fig. 754. 



= seminvjva, Morelet : Journ. de Conchyl, 1864, p. 289. 



= jmrsoni, Cox: P.Z.S., 1872, p. 18, pi. 4, fig. 2. 



Loc. — Queensland. 



Types in British Museum. 

 The types of lestioni and par^oni represent the extremes of this species, the 

 former being very small and somewhat depressed, whereas the latter is 

 larger and rather higher in the spire than usual. Although legsoni, by 

 reason of its dark brown colour, white peristome, and absence of spiral 

 bands on the lower whorls, is readily separable from incei ; yet it agrees so 

 closely in other respects, that I am doubtful as to whether it can be any- 

 thing more than a colour variety of that species. The earlier whorls are 

 lighter in colour and the middle ones have generally two or three narrow 

 spiral bands 



T. lessoni v. aureedensis, Brazier. 



P.Z.S., 187 1, p. 640; Tryon's Man. of Conch., vol. viii, p. 282, pi. 54, 

 figs 7-9. 



Loc — Yeppon, near Rockhampton, Queensland. 



Type in Australian Museum. 

 Very similar above to lessoni in form and coloration, but slightly flatter 

 below and with a broad light-yellowish circum-umbilical patch ; the tri- 

 angular dilated portion of the peristome at the point of insertion is white, 

 whereas in lessoni it is of a brownish colour. 



