REPORT ON THE ANOMURA. 179 



the basal portion being of considerable breadth. The pterygostomial region is smooth 

 but bears a sHght depression near its centre. 



The chelipedes are of moderate length, and the joints are everywhere perfectly smooth 

 and glabrous, with the exception of a smaU spine at the upper and distal end of the 

 ischium. The palm is sliglitly dilated, and equal in length to the carpus ; the fingers 

 are somewhat curved, and in male specimens a distinct hiatus exists betw^een the two, a 

 pair of conical teeth, the second of which is the larger, occur on the inner and proximal 

 margin of the dactylus, with corresponding depressions on the inner margin of the 

 immobile finger. The ambulatory limbs are slender and smooth, with the exception of 

 the usual horny spinules on the posterior margin of the propodi ; the dactyli are strongly 

 curved, and more than half the length of the penultimate joints, with a series of short 

 horny spines on their posterior margin. 



The eyes are of moderate size, with the cornese slightly dilated and of a light brown 

 colour. The antennal acicle is not more than half the length of the peduncle, and 

 narrows rather abruptly towards the apex ; the flagellum is about twice the length 

 of the peduncle. The external maxillipedes are perfectly smooth and glabrous, with 

 the exception of the usual hairs. 



The abdominal segments are smooth and glabrous externally, and their pleura are 

 subobtuse. 



This species is distinguished by its almost complete smoothness, and by the form of 

 the fingers, more especially in male specimens. 



Breadth of carapace (of a female with ova) 5-5 mm., length of body (including 

 rostrum) 18 mm., of carapace (including rostrum) 8 mm., of chelipede 24 mm., of chela 

 9 '5 mm., of ambulatory leg (detached) 12 mm., diameter of ova about 1"2 mm. In the 

 male specimen (which is of slightly smaller size), the chelipedes are proportionately longer 

 and stouter, and a hiatus exists between the fingers. 



Habitat. — Station 171, near the Kermadec Islands; depth, 600 fathoms; bottom, 

 hard ground. A female with ova, and a male. 



Uroptych'us australis, Henderson (PI. XXI. fig. 4). 



Diptychus australis, Henderson, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 420, 1885. 



CJiaracters. — The carapace is everywhere smooth and glabrous, only a single small 

 tooth being present at each antero-lateral angle. The gastric area is slightly swollen 

 and raised above the level of the rostrum, with in some cases two very minute denticles 

 present on its anterior margin. The rostrum is horizontal in direction, and extends for 

 about one-fourth of its length beyond the apices of the eye-stalks ; it is of consider- 

 able breadth towards the base, but gradually narrows towards the acute apex. The 



