130 THERSITES. 



ranks of long, narrow tubercles. The rest of the body is covered with 

 irregular polygonal tubercles which are usually partially subdivided 

 into minor tubercles; those on the tail being small, round and en- 

 tire. There is a small triangular right mantle lappet, and appar- 

 ently, a long left lappet, which emits two small lobes on the left 

 side at the origin of the left facial (lateral) groove (pi. 33, figs. 6, 7, 

 living animal of T. gulosa, after Hedley). 



Jaw arched, crossed asymmetrically by 9 stout, flat-topped unequal 

 ribs, denticulating both margins; ends smooth (pi. 33, fig. 5, T. 

 gulosa). 



Radula (of T. gulosa) having 180 rows of 39'18-1-18'39 teeth. 

 Central and inner lateral teeth unicuspid ; outer laterals oblique ; 

 marginals with a long, oblique bifid inner cusp (ento- + meso-cone) 

 and a small ectocone. 



Genitalia (pi. 33, fig. 4, T. gulosa, after Hedley), having the 

 penis twisted and swollen near its apex ; retractor inserted low on 

 the epiphallus, which bears a flagellum at the insertion of the vas 

 defereus. Duct of the spermatheca long, inserted high on the vag- 

 ina. 



In soft anatomy and dentition, Badistes offers no variation from 

 the type prevailing in Sphwrospira, Tkersites or Chloritis. In dis- 

 tribution it is more southern than Sphcerospira, occurring mainly in 

 New South Wales, Victoria and South Australia. The species are 

 highly polymorphic, and have evidently been moulded by external 

 conditions into a great number of local forms. There are more than 

 enough specific names, the only difficulty being which and how 

 many to discard. The reduction of species in the following list is 

 mainly made by the advice of Messrs Cox, Hedley and Brazier 

 Con/. Brazier, Proc. Linn. Soc. N. S. Wales (2), vi, p. 321. 



Gould supposed that Helix gulosa travelled like the caterpillar of 

 a geometric moth, by a series of loops ; but this has been shown to 

 be an error, probably caused by some confusion in the collector's 

 notes. 



( Group of gulosa.) 



T. duralensis Cox, vi, 141. T. Isesa Rve., iii, 214. 



T. daintreei Braz., vi, 134. T. pliculosa Pfr., iii, 216. 



T. patruelis Ang., vi, 131. T. expeditionis Cox, iii, 214. 



T. dunkiensis Forbes, iii, 215. T. corneovirens Pfr., vi, 136. 



v. mulgore Cox, vi, 136. 



