TIIERSITES. 133 



shaped, the walls of its cavity granulated, having a large solid, 

 granulated papilla at the apex, near the entrance of the epiphallus 

 (pi. 33, fig. 3, papilla indicated by dotted line). Epiphallus 

 long, the penis retractor inserted at the proximal third of its length ; 

 ending in a flagellum. Penis retractor short, attached to floor of 

 the lung cavity. Right eye-peduncle retracted between primary 

 branches of genitalia. PI. 33, figs. 2, 3, H. mitchellce ; fig. 2, 

 reverse view of vagina, showing lower course of uterus and vas 

 deferens. (From a specimen received from Dr. Cox). 



T. mitchelloB and broadbenti have the type of genitalia described 

 above, but in the latter the spermatheca has a shorter stalk. A 

 second type of genitalia is found in T. basalis (=rainbirdi), T. 

 fraseri, T. blomfieldi in which species the epiphallus is extremely 

 short and the flagellum either extremely short or obsolete, evidently 

 by degeneration. Only by opening the penis can the true condition 

 of these organs be ascertained. (See pi. 32, fig. 51, T. rainbirdi, 

 after Hedley). 



In anatomy, Sphcerospira agrees with Badistes and Thersites, 

 except that in some species the appendages of the penis have under- 

 gone degeneration resulting in secondary haplogonism. The group 

 inhabits Queensland with a few forms in New Guinea, being 

 replaced southward by Badistes, westward by Xanthomelon. 



Most of the species of Sphcerospira live under the loose bark of 

 fallen trees and on the ground, and are gregarious. Some occur 

 under stones in damp places. No Hadras are arboreal, according 

 to Hedley ; differing totally in this respect from Papuina, but 

 agreeing with Chlorifis. 



(Imperforate species). 



T. fraseri Gray, vi, 150. T. croftoni Cox, vi, 153. 



v. flavescens Hedl., vi, 151'. T. blomfieldi Cox, vi, 154. 

 T. coarctata Fer., vi, 151. v. warroensis Hedl. & Mouss., 



T. zebina Braz., vi, 151. [viii, 281. 



T. mossmani Braz., vi, 152. T. mitchellse Cox, vi, 154. 



T. coxi Crosse, vi, 152. T. gratiosa Cox., vi, 155. 



forbexi Cox, preoc. T. etheridgei Braz., vi, 156. 



cerea Cox, preoc. T. macleayi Cox, vi, 156. 



cerata Cox. T. andersoni Cox, vi, 157. 



( Umbilicated species). 



T. rainbirdi Cox, vi, 157. T. rawnesleyi Cox, viii, 282. 



basalt* Mouss. T. barneyi Cox, vi, 165. 



