iSS 



on the propodites and the dactyli, except for some minute hairs on the meropodites. These 

 latter are five times as long as broad, narrowing towards the distal end, unarmed, longer than 

 carpo- and propodite together; dactyli long, curved, st>-liform, finely pointed, as long as propodites. 

 Abdomen of cT (fig. 2e) much resembling that of G. simiatifrons (pi. 9, fig. 2 a): first 

 seo-ment hidden under the carapace-, second segment exposed, half as broad only as the 

 last seo-ment of the sternum, so that a \\ide space is left between the sternum and the 

 last pair of legs: third segment but very little broader than the preceding, 

 with the lateral angles obtuse, scarcely prominent: fourth to si.xth segment gradually increasing 

 in lenoth, fourth and fifth segment narrowing forward, though ver^- little, sixth segment with 

 lateral margins perfectly parallel and twice as broad as long; terminal segment triangular, 

 somewhat longer than the preceding, but little more than half as long as broad, tip rectangular. 

 That the base of the abdomen is much narrower than the space between the insertion of the 

 posterior legs is also shown in Filhols figure of O. huttoiii. 



The occurrence of this new representative of Ommatocarcimis, which in its outer appearance 

 recalls some broad-fronted species of Lea, (on account of the greatly-elongate eye-stalks), in the 

 Indo-Malavan region is worth mentioning, the genus being hitherto confined to East Australian 

 and New Zealandian waters only. The single specimen is ver}- small, measuring not yet 5 mm. 

 in breadth, the other two species grow to a much large'r size : as has been said. I could not 

 consult White's original diagnosis and so I am ignorant, whether dimensions at all are given, 

 but MiERs' specimens (both Q) of O. niacgillivrayi are very much larger, the breadth of the 

 carapace, not including outer orbital angles, measuring 15 and 19 mm., and the single specimen 

 of O. Inittoni even attains a maximum breadth of 35 mm., with the lateral spines included. 

 Dimensions in mm. : 



Greatest breadth of carapace (lateral teeth included) . . 4.6 

 Breadth of front between bases of eye-peduncles. . . . i.i 



Length of eye-peduncle 2.2^ 



Transverse diameter of eye 0.6 



Length of carapace 2.35 



Length of cheliped .... 7.5 



Subfam. Prionoplaclnae. 



This subfamily was originally instituted by Stimpsox ^) to receive his genus Euryplax, 

 described already in 1862. and some related genera: the name Euryplacinae was accordingly 

 bestowed upon the group. Miers -) retained it as a subgroup of his subfamily Carcinoplacinae 

 (fam. Ocypodidae) and afterwards Alcock % becoming aware that most likely the obscure genus 

 Prionoplax of H. Milxe-Edwards, established as early as 1852, would form the prototype of 

 the group, accordingly altered the name of this subfamily into Prionoplaclnae. 



1) Bull. Mas. comp. Zool. Harvard Coll., v. 2, 1S70, p. 150. 



2) Rep. *Challenger', Brachyura, 1S86. p. 222. Into the same group ihe Eucratcpsinae of Stimpsox (I.e.. p. 151) are included. 



3) Journ. As. Soc. Bengal, v. 69, prt 2, 1900, p. 286, 292. 



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