BY P. E. GRANT AND ALLAN R. McCULLOCH. 25 



The orbits, which are small, are situated at the apices of 

 obtuse angles formed by the margins of the frontal process and 

 by straight lines leading to the prominent hepatic angles; behind 

 which the anterior and posterior lateral margins are finely 

 crenulate, the crenulations beinsj the termini of a series of fine 

 radial ridges which fade away before reaching the centre of the 

 carapace. The lateral margin is not continued on the dorsal 

 surface of the carapace behind the hepatic region as described in 

 C. haddoni Caiman. 



The margin from the hepatic angle to the anterior lateral 

 angle, and the posterior lateral margin, are subequal in length, 

 and meet almost at right angles. The posterior margin is long, 

 almost straight, and without crenulations. 



The antennulary fossa? are transverse. 



The third maxillipeds have the bases visible, the ischium is of 

 about the same length as the merus, which is acutely triangular, 

 and projects beyond the bucal cavern, reaching the antennulary 

 fosste. The exopod is not so broad as the ischium, and only 

 reaches about half its length. 



The chelipeds have all the joints, from the merus outwards, 

 carrying a prominent knife-like crest with a crenulate edge. 

 The fingers are grooved, finely serrate, and somewhat overlapping 

 at the tips when closed. 



The ambulatory legs have the merus, carpus and propodus with 

 a similar sharp crenulate crest; the dactyli are spinulose. 



The abdomen of the male is regularly triangular, elongated and 

 acute. The first segment is exceedingly small and not visible 

 from a dorsal view; the second, third, fourth, fifth and sixth 

 segments are coalescent; and the last segment, which is free, is 

 long and pointed. 



Dimensions of type : — 



Length from anterior point of frontal process to posterior margin 4|mm, 

 Breadth of carapace between lateral angles 6 mm. 



Three specimens of this very elegant little crab were dredged 

 in 17-20 fathoms near Mast Head Island, only one, however, 



