NO. 14 MILLIPEDS OF WEST INDIES AND GUIANA LOOMIS 25 



raised rim reaching from the eye to the posterior corner of the 

 segment. 



Second segment continuing below segment i with scarcely any 

 angulation of the surface, hardly dififering from segment 3 in ap- 

 pearance. 



Ensuing segments divided into halves by a strong transverse con- 

 striction containing a series of crescentic impressions reaching from 

 the tips of the legs across the dorsum. Lateral striae confined to the 

 ventral surfaces, not extending beyond the tips of the legs. Exposed 

 dorsal surface of the segments smooth and shining, with a few short, 

 fine longitudinal scratches. Anterior division of the segments almost 

 flat longitudinally, posterior divisions moderately convex. Pores 

 large, borne well behind the constriction. Pores of segment 6 larger 

 than the others and lower on the body. Segment 7 without pores. 



Anal valves strongly convex, smooth, without compressed margins, 

 meeting in a deep groove. 



Preanal scale broad, rounded-triangular. 



The male type has 36 segments, of which the last 3 are without legs, 

 but in spite of this the gonopods seem to be fully developed, as shown 

 in figure 12, b and c. The gonopods bear some resemblance to those 

 of the genus Microspiroholus, but the median plate is more triangular, 

 and the inner gonopods are decidedly more simple, being slender and 

 attenuated. 



The pregenital legs of the male show no marked modifications, but 

 the first two pairs of legs are nearly as long as the third pair and are 

 considerably heavier. 



Ty/'c.— U.S.N. M. no. 1095. 



AZYGOBOLUS, n. gen. 



Type. — Asygoholus tuinidus, n. sp. 



Diagnosis.- — The location of the pore far behind the transverse de- 

 pressions of the segments associates this genus with Microspiroholus 

 and Aporohohis, but otherwise the relationship is remote, for the 

 body is remarkably slender and submoniliform ; the pores are borne 

 on slight but evident swellings ; and most unusual of all, the gonopods 

 are devoid of a median plate, the generic name alluding to this unique 

 condition. The posterior gonopods bend back over the coxae of the 

 eighth pair of legs and appear incapable of being retracted into the 

 body. 



Description. — Body long, narrow, submoniliform, resembling Nan- 

 nolene or some of the other cambalids rather than a spirobolid. 



