462 Transactions. 



The whole integument of body imperfectly calcified, the 

 cephalothorax and anterior portion of abdomen being more or 

 less membranous, posterior part of abdomen more calcified, but 

 the great chelipeds the only parts thoroughly calcified. 



Eye peduncles flattened, triangular with outer margin con- 

 vex, inner margins contiguous and produced anteriorly into a 

 short spine projecting upwards and forwards. Eyes round and 

 generally well pigmented. 



The 1st antennae about as long as the cephalothorax ; peduncle 

 longer than flagellum, its 1st joint short, a little longer than the 

 eye-lobes, 2nd longer, 3rd as long as 1st and 2nd together, the 

 two flagella equal in length. 2nd antennae slender, fully twice 

 as long as cephalothorax ; peduncle a little shorter than that of 

 the inner ; flagellum very slender. 



Third maxillipeds with the ischium and merus much swollen 

 and rounded, line of junction wide and straight, the two joints 

 together being subglobose ; on their inner face a longitudinal 

 row of small spines runs along the middle of the ischium in the 

 direction leading to the insertion of the carpus ; on the merus 

 it is represented only by a line of long setae. Inner margins 

 and part of the outer surface fringed with long setae. Three 

 terminal joints slender. 



Chelipeds unequal, either the right or the left may be the 

 larger. The larger cheliped much expanded and flattened, outer 

 surface slightly convex, integument much calcified, the whole 

 appendage probably serving as an operculum to close the opening 

 of the burrow in which the animal lives. General shape and 

 proportions of the joints much as C. ceramica, but the upper and 

 lower margins of the carpus and propod more produced into thin 

 flat crests, the upper margin of carpus being produced proximally 

 into a small rounded lobe, and the lower margin produced down- 

 wards into a large rounded lobe towards the distal end. 



The smaller cheliped with a small spine on lower margin of 

 merus. Remaining pereiopods of usual shape. 



Telson a little longer than the branches of uropods, somewhat 

 narrowed posteriorly, posterior margin rounded, fringed with long 

 setae, dorsal surface smooth ; branches of uropods with pos- 

 terior margins rounded and fringed with long setae, dorsal surface 

 of outer branch with slight median ridge. 



Length — Cephalothorax, 13 mm. ; abdomen, 42 mm. : total 

 length of body, 65 mm. 



Colour (in spirit), dull white. 



Hob. — Stewart Island {Filhol and H. B. Kirk) ; Oamaru 

 (T. Forrester) ; Timaru (specimens in Canterbury Museum, col- 

 lected by A. Haylock). 



Remarks. — From the description given above it will be seen 



