NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 



63 



First segment with the prockiced anterior margin divided into four 

 large, scalloped, widely separated lobes, the two middle ones most 

 widely separated and the anterior margin of each divided into three 

 scallops, the lateral lobes each with two scallops on the anterior margin. 

 Disk with 10 prominent conic tubercles. The dorsal surface and all 

 the margins are incrusted with dirt (fig. 31, b). 



Second segment with four narrow longitudinal ridges, the apex of 

 each being divided into three sections ; all margins of the segment 



Fig. 31. — Botrydesmus lutosns. a. segment from near middle of body, end 

 view; b, first 2 segments, dorsal view; c, last 4 segments and valves, lateral 

 view ; d, gonopod, lateral view ; c, keel of segment 7 with coating of dirt removed, 

 dorsal view. 



elevated, thin, especially on the keels ; lateral margin of the keels 

 3-lobed. 



Ensuing segments with the dorsal surface and raised margins as 

 on the second segment ; the keels all 2-lobed ; the actual surface sculp- 

 turing of the segments is obliterated by the very general incrustation 

 of dirt. As the posterior end of the body is approached, the two 

 median ridges increase in height and each lateral ridge decreases until 

 on the penultimate segment the lateral ridges are not evident but the 

 dorsal ones are very high, though not greatly produced backward 

 (%• 31, c). 

 5 



