360 CRUSTACEA. 



Length of carapax of a male, eight lines; breadth, ten lines; ratio, 

 1 : 1-25; breadth of front, four lines. Male abdomen narrowing much 

 from third segment to penult, and outline in this part very slightly 

 excavate; penult segment with arcuate sides; last segment about half 

 as wide as penult, very slightly longer than wide, and broadly rounded 

 at apex. Fifth joint of second pair of legs above, covered, upon apical 

 half at least, with a very short tomentose coat ; tarsus of same pair 

 above tomentose, with either two very narrow naked lines, or none 

 apparent. Fingers denticulate on inner edges. Ciliate crest of third 

 joint of outer maxillipeds is produced backward, so as to reach the 

 outer margin of the second joint, about two-thirds or three-fourths of 

 the way to the base of this joint; third joint nearly naked, longer than 

 broad and hardly shorter than the second. Fifteen or sixteen minute 

 crenatures along the ridge below the orbit. 



The abdomen differs widely from that of the Valparaiso species, in 

 narrowing so much backward, and the orbits are also different in 

 being very imperfect below. The eyes, moreover, are longer. 



Cydograpsus Audouinii, EDWARDS, Crust., ii. 78. 



CYOLOGRAPSUS CINEREUS. 



Carapax parce transversals, non areolatus, paulo nitidns, non granulatus. 

 Orbita. infra plerumque circumscripta. Articulus maxillipcdis externi 

 Stius valde oblongus, 2do non brevior, pubescens, cristd fere ad angu- 

 lum 2di externo-posteriorem produced. Digiti intus denticulati. Arti- 

 culus pedis 2di 5tus apice non tomentosus, tarso non spinuloso, lineis 

 angustis tomentosis supra ornato. Abdomen maris fere rectangulatum, 

 posticb parce angustius, lateribus subparaUeli*, rectis, segmento 2>ostico 

 elongatb triangulato, triplo angustiore quam penultimum. Sternum 

 pone aream buccalem pubescens. 



Carapax sparingly transverse, not areolate, a little shining, not granu- 

 lous. Orbit mostly complete below. Third joint of outer maxil- 

 lipeds much elongate, not shorter than second, pubescent, crest ex- 

 tending back towards posterior outer angle of second joint. Fingers 

 denticulate on inner edges. Fifth joint of second feet not tomen- 

 tose at apex; tarsus not at all spinulous, having a few narrow 



