60 ZOOLOGY OF THE VOYAGE OF H.M.S. SAMABANG. 



our national collection in the form of Noiopus dorsipes, De Haan, was obtained by us in the 

 province of Unsang in Borneo, and a new genus {Cosmonotus) also rewarded our exertions 

 while examining the same locality. 



1. COSMONOTUS, Adams §r White, 



Thorax ovalis, antice acuminatus, lateribus valde compressis, in linea media carina prominente, later- 

 ibus integris, angulo latero-anteriore spina, brevi acuta. 

 From profunde incisa, ad latera spina parva acuta. 

 Chela trigonales, interne planse, externe convexse. 

 Abdomen (maris) articulis septem, articulo ultimo trigonali. 



Carapace oval, very much compressed laterally, especially in front, with a distinct pro- 

 minent keel extending down the middle line, very strongly marked in front, but fainter 

 posteriorly. 



Front with a very small spine on each side of a deep angular notch, in which are placed 

 the eyes. 



Fore-legs strong, triangular, the upper claw arched, the lower claw small and dentated 

 on the edge. 



Abdomen (in the male) seven-jointed. 



1. COSMONOTUS GEAYII, Adams $ White. (Tab. XIII. Kg. 3.) 



Thorace punctis multis depressis obsito. 



Fronte valde incisa externe spina parva acuta. 



Chelis trigonalibus bracliio infra piano, externe convexo lineis multis transversis interruptis, supra carinato 

 pilis fimbriato, interne concavo, carpo incurvato subcompresso, externe convexo, interne spina obtusa ; manu 

 compressa. aspera, margine superiore arcuato ; digito inferiore angusto, elongato dente robusto prope 

 extremitatem, digito inferiore brevissimo incurvato ; pedibus posterioribus gracilibus brevibus. 



Hab. Borneonem. 



Carapace about an inch in length and half an inch wide, covered with numerous minute 

 depressed punctures. 



Fore-legs trigonal, the third joint plane on the under surface, the exterior convex with 

 transverse, interrupted, engraved or impressed lines, the upper angle covered with long thick 

 hairs, the inner surface concave ; the fourth joint incurved, sub-compressed, convex externally, 

 less convex internally, ending above and in front in a blunt spine ; fifth joint compressed, 

 elevated, with the upper edge arched, but not so sharp as in Notopus ; the sides convex and 

 covered with asperities or minutely denticulated ridges, interrupted and transverse ; upper 

 claw narrow, compressed, elongated, with a sharp apex, and a strong tooth near the distal 

 extremity. 



Feet short and weak as in Notopus ; the first tibia bicarinated ; the tarsus subquadrate, 

 anteriorly bicarinate, with a scalpel-shaped claw ; the second tibia one-keeled, with the tarsus 



