26 T)R. W. T. CALMAN ON A COLLECTION OF 



as long as broad ; the tingers are grooved and oue-tbird tlie length of the palm. The 

 walking-legs have the merus compressed and crested above and below, the carpus and 

 propodus with a double keel on the upper edge and the dactylus styliform. The abdomen 

 of the female is very nearly circular in outline, and the first, second, and last somites are 

 free. The whole of the under surface is quite smooth. 



Length 5-5 mm. ; breadth 7 '25 mm. 



Of the four described species of Cryptocnmius our new form approaches most closely 

 to the type, C. pentagonus of Stimpson (Pr. Acad. Philad. 1858, p. 161), figured by 

 Miers (Proc. Zool. Soc. 1871), p. 13, pi. ii. tig. 5), whose imperfect specimen I have 

 examined. In that species, however, the wings of the carapace are produced into acute 

 lateral angles, and the straight postero-lateral and posterior margins meet at an obtuse 

 angle ; the front is more sti'ongly reflexed and more acute, the branchial regions are more 

 convex, the lateral margins are not continued on to the dorsal surface in front, and the 

 granulation of the posterior and lateral margins is more pronounced than in the present 

 species ; the antennular fossae ai'e oblique and the palp of the external maxillipeds is 

 rounded, not distinctly truncate, at the tip. In C. Hokhicorthi, Miers (Tr. Lion. Soc, 

 (2) Zool. i. p. 241, pi. xxxviii. figs. 30-32, 1878), the lateral margins are at right angles 

 to the posterior margin, and there are two olilique carinse running from the cardiac 

 region to the posterior corners on the dorsal surface of the carapace. C. Grand tdicrl, 

 A. Milne-Edwards (Ann. Soc. Ent. France, (4) v. p. 155, pi. vi. fig. 4, 1865), resembles 

 Q. HoldswortJii in general shape, but has a broadly truncate front, the posterior border 

 is notched in the middle, and the surface of the carapace has three granulated carina? 

 diverging from the centre to the rostrum and the two posterior corners respectively. 

 Finally, C. oboliis, Ortmann (Zool. Jahrb. Syst. vi. p. 570, pi. xxvi. fig. 12, 1892), has a 

 nearly circular outline, the rostrum is bifid, and the hepatic prominences are acute, 

 almost spiniform, teeth. 



Locality. " Channel between reefs, Mer." 



Oreophoeus frontalis, Miers. 



Oreuphorus frontalis, Miers, Rep. Voy. ' Alert,' p. 2o4-, pi. xxvi. fij^. B. 



A comparison of our eight individuals with the unique type specimen leaves no doubt 

 as to their identity. Miers's figure does not represent quite accurately the proportions 

 of the carapace, the relative length, and especially the prominence of the whole frontal 

 region, being considerably exaggerated. 



Localities. "Flinders Entrance, near ^ler " ; "Channels between reefs, Murray 

 Island." 



Myra tug ax (Fabr.). 



Myra fur/fix (Fa])r.), Alcock, .lourii. Asiatic Soc. Bengal, Ixv. [2) p. 202 (1890) (and syuouyms). 

 M. pentacantlia ?, Alcock, 1. c. p. 204. 



Two male sp(>ciuiens, of small size and therefore difiieult to determine with certainty, 

 ar(^ probably young forms of this common and variable species. The smaller of the two 

 possesses five spines on the posterior margin of the carapace and a well-marked tubercle 



