408 PROCEEDINGS OF THE NATIONAL MUSEUM vol. S9 



midlength than the anterior. Postorbital ridges extending posteriorly 

 more than half the distance between apex and cervical groove. 



Surface of carapace punctate, with minute tubercles laterally. No 

 lateral spines present. Cephalolateral margins each with one spine 

 near the anterior extremity of cervical groove. 



Abdomen slightly longer and slightly narrower than carapace. 

 Anterior section of telson with two spines in each of the postero- 

 lateral corners. 



Ventral surface of cephalothorax and third maxillipeds heavily 

 barbate. 



Epistome broader than long, margin elevated with two strong obtuse 

 median crenations and two weaker lateral crenations. 



Antennules of the usual form. A spine present on ventral side of 

 basal segment. 



Antennae extending posteriorly about midway of the fourth ab- 

 dominal segment. 



Antennal scale of moderate size, broadest anterior to middle, extend- 

 ing to the tip of the second joint of peduncle of antennule, spine on 

 outer margin strong. 



First pereiopod heavy. Setiferous punctations scattered over entire 

 hand; inner margin of palm barbate (sometimes only the right). A 

 single distinct dorsomedian ridge along both fingers. Outer margin 

 of immovable finger with a distinct ridge. 



Movable finger: Inner margin with about 11 truncate or knoblike 

 tubercles; the distal half crowded with minute denticles. Mesial 

 margin with about 13 small tubercles irregularly arranged along 

 proximal half. Dorsal surface with a median ridge. 



Immovable finger : Inner margin with about 1 1 truncate or knoblike 

 tubercles ; the fourth from base and the eleventh largest ; the eleventh 

 not in line with the others but slightly more ventrad. Minute den- 

 ticles crowded along the distal third. Outer margin bears a ridge with 

 a single row of setose punctations on either side. Dorsal surface also 

 with a median ridge. 



Carpus longer than wide, not so long as inner margin of palm of 

 chela, a shallow longitudinal groove above, inner side tuberculate, 

 otherwise covered with setiferous punctations. 



Merus with scattered tubercles above and sparsely punctate laterally 

 and mesially; ventromesial margin with about 16 serrations; ventro- 

 lateral margins with about 16 irregularly spaced tubercles; antero- 

 oblique margin joining these with four tubercles. 



Ischiopodites of the third pereiopods hooked. Hooks simple, 

 moderately strong; caudodorsal surface excavate. 



First pleopod extending to anterior margin of coxopodite of fourth 

 pereiopod. Tip terminating m four distinct parts, as follows: The 



