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MILLIPEDS OF FAMILY LYSIOPETALIDAE LOOMIS 129 



crests; setae in a siibtriarcuate series, the six inner setae nearly in a 

 straight line. 



Transition to the full number of dorsal crests occurs on segment 16. 



Primary crests high, moderately thickened, the apex smooth, con- 

 tinuous in lateral view, a single row of small, circular pits on each 

 side below the apex below which the sides are reticulated. 



Secondary crests lower and slenderer than the primary crests, the 

 sides with similar punctations and reticulations; crests usually 

 crossing only the anterior three-quarters of the subsegment, but the 

 inner pair frequently extending to the posterior margin; surface be- 

 hind the crests descending gradually to a somewhat lower level be- 

 tween the primary crests. 



Surface between both types of crests roughly and finely reticulate 

 as on the sides of the crests ; the middle of each interval usually with 

 a row of very tiny granules not reaching either margin of the sub- 

 segment; between the median line and the secondary crest each 

 side is a row of similar granules which extends completely across the 

 segment. 



Poriferous carinae rather strongly projecting, the anterior angle 

 broadly rounded, the posterior angle slightly more acute than a right 

 angle ; on the caudal segments the outline of the lateral margin of the 

 carinae is smooth and continuous, as the poriferous impression 

 reaches the length of the margin to the posterior corner, but on the 

 other segments, in front, the impression occupies only part of the 

 margin and its posterior limit is indicated by a distinct recession of 

 the margin following it (fig. 16, /). Poriferous area broad and sur- 

 rounded by a strongly thickened rim with pits on both sides, the 

 apex smooth; pore located near the center of the impression. The 

 two primary crests below the lateral carinae are somewhat heavier 

 and more prominent than the dorsal crests. 



Anterior subsegments with the posterior channels longer than 

 broad, separated by distinct, beaded lines; bottoms of the channels 

 very finely reticulated ; in front of the channels the reticulations are 

 very much coarser than in them, and there are prominent raised lines 

 extending lengthwise through the netting. 



Last segment broadly truncate behind ; with 12 short setae on the 

 dorsal surface and two short papillate hairs in the apical margin. 



Anal valves scarcely inflated, the margins thin and only moderately 

 raised. 



Male gonopods with the erect piece on each side not expanded 

 at the tip as in the other species with the exception of tihurona, but 

 it is abruptly bent forward and ends in two prongs, one of which is 

 directed upward, the other downward ; behind the upper prong is a 

 smaller erect subapical pointed projection ; below the bend near the 



