132 DE. J. G. DE MAN ON THE PODOPHTHALMOTJS 



separated from one another, are covered witli minute tubercles 

 or granules. 



As regards the inflected regions of the carapace, D. Irevitarsis 

 much resembles D. sulcata, the pterygostomian and subhepatic 

 regions being sulcate, whereas the posterior or subbrauchial 

 portions of the under surface are not grooved, but covered with 

 short cilia ; the grooves of the pterygostomian and subhepatic 

 regions are, however, in D. hrevitarsis a little more numerous and 

 narrower. Furthermore, on the posterior portion of the under 

 surface a row of cilia occurs, proceeding from the anterior part of 

 the lateral margin of the upper surface to the base of the fourth 

 pair of legs. 



The outer foot-jaws (fig. 3) also closely resemble those of 

 D. sulcata ; the merus-joint is larger than the ischium-joint, which 

 is quite smooth ; both joints are separated by an almost transverse 

 suture. The merus-joint presents four longitudinal narrow 

 grooves, arranged in such a manner that the elevated parts, which 

 separate the grooves from one another, constitute a W-like figure, 

 the opening of which is directed forward. As on the uj)per surface 

 of the cephalothorax, the elevated ridges on the merus-joint of 

 the maxillipedes and on the subhepatic and pterygostomian regions 

 are covered with small granules. The sternum is smooth, and 

 does not present the ovoid membranaceous plates which are 

 characteristic of D. fenestrata. The abdomen of the male, 

 however, has a characteristic form and differs much from that 

 of 1). sulcata. The terminal or first joint is triangular, being as 

 long as broad at the base and rounded at the tip ; the second is 

 as long as the terminal joint, scarcely broader than long, and with 

 somewhat arcuate lateral margins ; the third joint is nearly as 

 long as the second and aboiit as broad as long, presenting a small 

 contraction close to the posterior margin; the fourth joint is only 

 half as long as the second, but is remarkably enlarged on each 

 side and narrowed again posteriorly, thus forming a rounded 

 lobe on each side ; the fifth joint is a little shorter than the 

 fourth and is also dilated on each side, though not so much as 

 the fourth joint ; the sixth somite is shorter than the fifth, 

 scarcely enlarged, so that it is three times as broad on its anterior 

 margin as it is long ; the seventh or basal joint is a little 

 longer than the sixth, and provided with a transverse elevated 

 crest. The lateral margins of the abdomen are fringed with long 

 hairs. 



