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



Two specimens were taken. The larger of these is a male, apparently fully developed, 

 the other is a female, proliably immature. The latter has a small sponge fixed to one of 

 its ambulatory limbs. 



Cryptodromia incisa, n. sp. (PI. I. fig. 4). 



Characters. — Carapace subglobose, the length and breadth almost equal, covered by 

 a short pubescence, which is more strongly developed on the anterior portion. Front 

 tridentate, the median tooth of considerable length, nearly vertical in direction and 

 acuminate, the lateral teeth project forwards, and are also acute though to a lesser extent 

 than the median process. The gastric region is convex, its surface glabrous and minutely 

 punctate (after removal of the hairs) ; on the anterior part, and immediately Ijehind the 

 frontal region, are two slight rounded elevations, separated from one another by a mesial 

 groove, which is continued on to the central rostral tooth. A well-marked depression 

 exists between the orbital border and the gastric elevation on either side. No distinct 

 line of demarcation separates the gastric and cardiac areas, but the latter is bounded 

 laterally by an ill-defined groove, and posteriorly by a depression which lies between 

 it and the posterior border of the carapace ; no inequalities are present on the 

 surface of this region. The hepatic area presents a small depression near the antero- 

 lateral angle of the carapace, but is otherwise smooth ; the branchial area is of very 

 limited extent. The antero-lateral border is short, and presents no other spines than 

 those met with on the lateral frontal and orbital regions. The lateral l;)order is convex in 

 front of the cervical groove and unarmed, with the exception of a tooth immediately behind 

 the groove ; it is fringed by hairs, which are clubbed and of considerable length. The 

 cer"\dcal groove is ill-defined, and ends on the surface of the carapace by splitting into 

 two shallow furrows which embrace the cardiac area. The posterior border presents a 

 slight mesial concavity. 



The subhepatic area is smooth and slightly hollowed out posteriorly for the inner 

 surface of the meral joint of the chelipede. The pterygostomial area is smooth, but a 

 well-defined border bounds the buccal cavity on either side, and a bilobed tubercle marks 

 its junction with the epistome. The eyes when retracted are almost completely hidden in 

 the deep orbits ; the superior border of the latter is armed with an acute spine, the outer 

 angle is marked by a narrow fissure, and the inferior border is produced into a triangular 

 and pointed tooth. The antennules are of small size, and partly hidden by the antenna ; 

 the latter possess a large hasal tubercle with an opening of considerable size for the duct 

 of the green gland ; the second joint of the antennal peduncle is large, and bears on its 

 outer and distal end a well-marked spine, with a secondary process near its base. The 

 external maxillipedes have the meral joint slightly shorter than the ischial, and the latter 

 is hollowed out inferiorly, the exognath extends to the end of the merus. 



