% 



MILLIPEDS OF FAIMILY LYSIOPETALIDAE LOOMIS 127 



Eye cluster siibquadrate, 42 to 52 ocelli in 6 to 9 rows; sense organ 

 in front of the ends of the third and fourth rows of ocelli. 



First segment with the inner crests extending across the posterior 

 two-thirds, the median pair not parallel but each crest bowed out, 

 especially in front; surface between all crests and in front of them 

 indistinctly roughened ; with 10 setae in a faintly triarcuate series in 

 front of the crests. 



Transition to the full number of dorsal crests occurs on segment 17. 



Primary crests strongly thickened and of moderate height, ending 

 in rounded-obtuse angles above the posterior margin of the seg- 

 ments; sides of the crests below the apex with numerous small pits 

 arranged in two rows, the uppermost forming a nearly straight line, 

 the lower row quite irregular; apex of the crests narrow and of 

 nearly uniform height, only very faintly subdentate when viewed 

 from the side. Secondary crests distinct although not greatly ele- 

 vated, rather thick and reaching across the anterior three-fourths of 

 the segment, while on the remaining fourth of the segment the sur- 

 face between the primary crests descends quite abruptly to a dis- 

 tinctly lower level; sides of the secondary crests with an incon- 

 spicuous row of pits near the apex on either side. Surface between 

 all the crests indefinitely reticulated but distinctly roughened and 

 slightly shining. 



Lateral carinae strongly produced, relatively more prominent than 

 in any of the other members of the genus, very broadly and evenly 

 rounded in outline from front to back and without distinct front 

 or back angles (fig. 16, i). Pore slightly in front of the middle of 

 the relatively short and broadly oval impressed area in the lateral 

 margin ; rim around the impressed area very greatly thickened and 

 with two more or less uniform rows of pits on the sides. The two 

 primary crests below the poriferous carinae are heavier and higher 

 than those on the dorsum. 



Anterior subsegments with the posterior channels especially deep 

 and short, about as broad as long and separated by prominent beaded 

 lines; surface in front of the channels finely reticulated, the longi- 

 tudinal lines through the reticulations not especially evident and 

 only slightl}^ raised. 



Posterior subsegments shorter in proportion to their width than 

 in any other species. 



Last segment with 12 dorsal setae in addition to the two papillate 

 hairs in the thickened apical margin. 



Anal valves with the margins moderately raised and decidedly 

 thickened ; disk of each valve definitely inflated. 



Gonopods, viewed from the side, with the erect piece on each side 

 enlarged at apex into an upward pointing leaflike expansion; from, 

 behind the base of the expansion, on the outer side, a long arm curves 



