STUDIES IN AUSTRALIAN CltUSTACKA — M< CULLOCH. 329 



Director, Dr. N. Annandale, very generously forwarded ine for 

 examination one of the specimens determined by Alcock as 

 Hyaatenus aries, which I have here figured for comparison with 

 Guerin's illustration of the other species. It was taken in the 

 Gulf of Martaban, 20 fathoms. 



Genus Naxia, Latreille. 



Subgenus Micuohalimus, Has well. 



Microhalimus, lias well, Proc. Linn. Soc. N. S. Wales, iv., 1880, 

 p. 435 (M. deflexifrons, Haswell); Id., Cat. Austr. Crust., 

 1882, p. 7. 



The relationship of Microhalimus and Pseudomicippe, Heller, 5 

 has been the subject of considerable discussion. Miers 6 placed 

 the latter in the Majidie, but Or tin arm 7 has shown that it really 

 belongs to the Inachidce and is allied to Halimus (—Naxia). 

 Haswell considered Microhalimus to be a subgenus of Halimus, 

 and, having examined his six specimens, I agree with his 

 opinion. Miers 8 also suggested that Microhalimus was identical 

 with Pseudomicippe, but it differs in lacking the broad antero- 

 superior orbital lobe, in having a long spiniform process 

 projecting forwards from the basal antennal joint, in having the 

 hepatic region armed with strong spines, and in the penultimate 

 joints of the ambulatory legs being slightly expanded instead 

 of cylindrical. Its general form is much more like that of 

 Naxia than of Pseudomicippe. 



I regard Microhalimus as only a subgenus of Naxia because 

 there are some species of the latter genus possessing characters 

 which are almost intermediate between the two. Haswell 

 considered that it differed in having the rostrum deflexed and 

 in lacking prominent spines on the carapace, but N. lumida 

 Dana 1 ' and N. spiuosa, Hess 10 often have the rostrum as much 

 deflexed as M. deflexifrons while the armature of the carapace 

 is very similar to that of N. tumida. In the structure of the 



s Heller-Sitzb. Akad. Wiss. Wien., xliii., i. 1861, p. 301, pi. i., fig. 3. 



6 Miers— Joum. Linn. Soc, Zool., xiv., 1879, p. 661. 



7 Ortmann— Zool. Forseh. Austr., v., 1894, p. 39. 



8 Miers— Zool. "Alert," 1S84, p. 198, and "Chall. " Rept., Zool., xvii. 

 1886, p. 68. 



B Dana— Wilkes U.S. Explor. Exped., Crust., i., 1S52, p. 165, pi. iv., 

 figs. 2a-d. 

 io Hess— Arch. Nat., xxxi., 1865, p. 129, pi. vi., fig. 1. 



