112 RECORDS OF THE AUSTRALIAX MUSTL'M. 



Copulatory apj)eudages : — Anterior gonopods (PL xv., figs., 

 23, 24), with ventral plate slightly expanded proximad, sinuate 

 above and ending in two diverging, blunt horns ; its lateral 

 expansions (f.) are curled back around the base of the organ 

 and meet the tracheal stalk (ts.) in a line on the posterior 

 surface. Coxofemoral plate (rf.) almost entirely exposed, as 

 long as the ventral plate, ending in a widely rounded angle. 

 Tibial plate (T.) irregularly circular or ti-iangular, entirely 

 lodged in the posterior excavation of the coxofemur ; distal 

 inner angle thickened and folded backwards; its proximal inner 

 angle shows a sub-triangular, translucent, shrivelled-surfaced 

 field, the meaning of which could not be ascertained. 



Posterior gonopods (PI. xv., figs. 25, 26), two-jointed. 

 Proximal joint with its proximal and inner edges thickened 

 and strongly chitinized, borne on an elongate and slender, 

 distally widening tracheal stalk. Distal joint strongly chiti- 

 nized ; its sides are folded inwai'ds, the inner surface being 

 deeply excavated, wherefrom the joint gains its resemblance 

 to a spoon. The hollowed surface is lined with membrane, 

 forming an undulated crest in which opens the distal end of 

 the seminal duct. The proximal end of the latter is swollen, 

 bladder-like (bl.) and .strongly twisted immediately above the 

 swelling, where it crosses over from the proxiinal to tlie distal 

 joint of the apparatus. 



Three male specimens from New (luinea. 



(li'iins Spirostrophus, SdK^x. mnl Zclmfii., 1902. 



Saussure and Zehntner-*^ have deemed it necessary to create 

 a sub-genus of 'rriiioultilii-'', termed Sjiiro!<fn>j>liii.<, for the 

 reception of two species. A generic value has since been 

 assigned to it by Attems.^i 



SpiruslruiiJiiis differs from Trii/oiiiiiliifi in having the tarsi of 

 the male not padded and the coxte of the third to fifth pair 

 ])rovided with processes. The Australian species has, therefore, 

 to be ascribed to the former genus. Yet SpirostropJnis seems 

 to lack the necessary homogeneity, as, in one of the species 



2" Saussure and Zehntner — In Grandidicr, Hist. Phys. Nat. ct 

 Polit. Madaj^ascar, 1897-1901'. 



-i Attcms — Myriopodcn in Vocltzkow, Rcisc in OstafiiUa, 19()3- 

 J905, 1910, p. 91. 



