30 THE VOYAGE OF H.M.S. CHALLENGER. 



The external maxillipedes have a raised line running along the inner margin of the merus 

 and ischium, the former joint is faintly granulated, with its outer border ciliated, the 

 latter smooth ; the three terminal joints are of very small size (less than half the 

 length of the merus), and inserted opposite a well-marked depression on the inner 

 edge near the apex of the merus ; the exognath slightly exceeds the ischium. The 

 epistome is deeply hollowed out on each side of a mesial ridge, and concealed by the 

 apices of the outer maxillipedes. The pterygostomial regions are strongly granular, and 

 pubescent. The sternal thoracic shield is broad between the chelipedes, but becomes 

 narrow between the first pair of ambulatory limbs, between the second and third legs it 

 widens out once more, and becomes linear between the legs of the third pair ; the broad 

 anterior portion is separated by a transverse suture in the line of the second pair of legs 

 from the smaller dilated portion behind ; immediately in front of this is a median depression. 

 In the female there is an ovoid median opening in the sternum, between the third and 

 fourth pairs (a similar opening is present in Raninoides personatus though of very small 

 size). The .side lappets present in Raninoides between the basal joints of the first 

 and second legs are present in this species also, but obtusely rounded and fringed with 

 hairs. 



The chelipedes are similar in shape to those of Raninoides, the ischium and merus 

 unarmed, but the latter with several transverse piliferous lines ; the carpus and propodus 

 are both granulated, the former with two subequal acute spines on the upper surface, the 

 latter with three acute spines on the lower border, which decrease in size from before 

 backwards ; the immobile finger is armed with about six teeth ; the dactylus is sliglitly 

 granular above, entire, with a thin cutting edge. The ambulatory limbs are smooth, and 

 (the last two pairs more especially) clothed with long hairs, the propodi of the first and 

 second pairs are slightly bent upon themselves, and the dactyli are hatchet-shaped, with 

 subacute apices. The last pair ai'e of moderate size, almost equalling the first j^air in 

 length ; their dactyli elongated and ovate. 



The abdominal segments are smooth, with a slight median elevation ; the second 

 segment is slightly wider than the first in both sexes ; the telson is triangular. The 

 abdominal appendages of both male and female resemble those of Raninoides ; the pro- 

 truded vasa deferentia in tlie male are short. 



The following are the measurements of an adult male : — Breadth of carapace 26 mm., 

 of fronto-orbital border 13 mm., length of carapace 34 mm., of chelipede 29 mm., of last 

 leg 22 mm., of abdomen 16 mm., of anterior genital organ 13 mm., of external maxilli- 

 pede 16 '5 mm. 



Habitat. — Station 192, off Little Ki Island ; depth, 140 fathoms ; bottom, blue mud. 

 Many individuals of both sexes. 



