140 KKCiiKlis n|' TlIK A I'STIIALI AX MI'SKTM. 



Sc'obiiias fvdni tlie eig'lith to about tlie tweiitv-tii'st zoiiite, 

 ueai'ly obsolete on tlie twenty-second. Dinijiles (PI. xviii., 

 Hg. 05) divided by a space almost equal to five times the 

 diameter of one of them. Dimples in the shape of a segment 

 of a cii'cle, open frontwards ; the bottom gradnally rises up to 

 the level of the zonite. I'osterior field rather long, nai-rowed 

 and I'ounded at the end ; strine thin and numerous. 



Concealed part of the prozonite smootli ; integuments of the 

 I'est of the zonites entirely covered with tiny stria:*, exti'emely 

 dense on the posterior part of the prozonite, less so on the 

 metazonites where the strife are somewhat coarser ; therefrom 

 the integuments gain a silky lustre. On the exposed part of 

 the prozonite, oblique stria? are seen« which are much larger 

 and deeper in the anterior part of the body than in the posterior. 

 On tlie sixth segment, for instance, one of the sulci, staT-ting 

 above the pore, assumes a transverse dii-ection, crossing entirely 

 the dorsal region in front of, and close to, the sutural sulcus ; 

 below the pores are five truncate sulci, the posterior ends of 

 which break off in the suture ; lower down the sulci, when 

 reaching the suture, assume a longitudinal course and cross the 

 metazonite entirely ; the lattei- striae are confined to the ventral 

 portion of the segments. 'The transverse pre-sutui'Ml sulcus is 

 interi'upted dorsal ly on segments two, three, four, and gradually 

 shortened on segments eight and backwards, no trace of it be- 

 ing found after the sixteenth ; also, the other sulci grow shorter 

 and weakei- backwai'ds. Sutural sulcus entire, more distinct 

 in the anterior half of the body than in the posterior half ; it 

 is slightly notched behind the pores. Pores begin on the sixth 

 segment; they are located high on the sides, and open in the 

 prozonite, in the centre of a small circular s|tot which is sniootli 

 and shining. 



i^ast segment with its posterior margin scai'cely pi'oduced, the 

 angle being almost entirely i-ounded off, and just covering the 

 upper angles of the valves. The lattei- ai'c considerably 

 reduced, nearly smooth, globular, each with a faint prt^-marginal 

 impi'ession. Anal stei-nite triangular, its Irnuth alxMit one- 

 fourth the breadth at the l)ase, its ape.v blunt. Stei'na of other 

 segn)ents sulcate, the sulci few in nunibei' (about eight). 

 Stigmata small. 



Jjegs vei'v shoi't, about one-tliii'd of the diameter of the bodv, 

 with but one bristle below on the pni\i?n;il live joints. 



