288 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



gin of basal antennal article. Male first pleopod with a short, acute tip ; 

 aperture delimited by fleshy folds that have a tendency to curl outward, 

 the more prominent fold obtusely angled. 



Description: Carapace pyriform, strongly arched when viewed in 

 profile, its surface clothed with tuberculiform cutaneous vesicles and with 

 delicate setae hooked at their tips. The spines and tubercles of the cara- 

 pace arranged as follows: four on the gastric region, two of these in the 

 median line and one on each side ; the posterior median having the form 

 of a blunt tubercle, from this a blunt low keel running back to the 

 cardiac region ; one in the middle of the cardiac region ; one [tubercle] 

 on the intestinal region ; one on each hepatic region ; five on each bran- 

 chial region. Of the branchial spines the one near the middle projecting 

 upward and forward, and the longest spine on the carapace, being one- 

 half as long as the rostral horns ; behind and inside of this a short, rather 

 blunt spine in a transverse line with its fellow and the cardiac spine ; the 

 three remaining branchial spines arranged in a triangle on the anterior 

 part of the branchial area ; those nearest the median line on the branchial 

 areas short and blunt — tubercles rather than spines. In addition to these 

 prominent spines and tubercles of the carapace, four or five small tuber- 

 cles on the outer border of the pterygostomian region. The rostrum pro- 

 duced into two divergent, awl-shaped horns, more than one-fourth the 

 length of the remaining portion of the carapace. The preocular spines 

 well developed and acute, the postocular processes obtuse. The basal seg- 

 ment of the antenna projecting at the anteroexternal angle in the form 

 of a short, blunt spine or tubercle. The anteroexternal angle of the 

 buccal area projecting, but not forming a dentiform process. 



The chelipeds twice as long as the carapace, minus the rostral horns, 

 and but little more robust than the ambulatory [legs] ; the carpus with 

 two low ridges on the outer face ; the chela a little longer than the merus, 

 the basal part cylindrical, the distal part gradually widening to the base 

 of the fingers. The fingers slightly curved, less than one-half as long as 

 the basal portion, smooth, prehensile edges regularly dentate, closing 

 throughout their length. 



The first ambulatory legs exceeding the chelipeds by the length of 

 the [dactylus]. The other pairs successively shorter, the last pair being 

 shorter than the chelipeds. The merus of all the legs with a small tuber- 

 cular projection at the distal end above, most prominent on the anterior 

 pair; otherwise the legs unarmed, but closely invested with minute 

 papillae, like the carapace. 



The abdomen seven- [segmented]. (Faxon, 1895, modified) 





