cKtrsiACEA. 283 



joints of the flagella almost naked. The scale. at base of the an- 

 tennae is acuminate at its distal end, and between it and the peduncle 

 ' is a strong spin©, ■which is apparently articulated with the ante- 

 penultimate peduncular joint. The outer maxillipedes are subpedi- 

 form, and the joints are hairy on their inner margins. The anterior 

 legs are wanting in the single specimen I have seen; the three 

 following legs have the joints somewhat compressed ; the merus and 

 carpus in the second legs are somewhat dUated and fringed below 

 with long hairs, the palm forming with the dactyl a perfect chela, 

 the fingers of which are acute and meet along the inner edges ; 

 the following legs are not subchelate ; the palm in the third pair 

 is ovate, fringed with short stiff hairs below and on the sides, 

 dactyl very short ; in the fourth pair the palm is somewhat slen- 

 derer and more elongated, more thickly clothed towards its distal 

 end with plumose hairs ; the fifth legs are shorter and comparatively 

 slender and feeble. The postabdominal appendages are biramose, 

 the inner larger than the outer branch. The rami of the uropoda 

 are somewhat indurated and considerably dilated ; their distal mar- 

 gins are straight, ciliated, and minutely spinulose, and they reach 

 to the end of the terminal segment of the postabdomen. Colour 

 (in spirit) whitish. Length about 1 inch 4^ lines (35 miUim.). 



The single example collected, which is, I think, a male, was ob- 

 tained on the beach between tide-marks at Port MoUe (No. 103), 

 and is in very imperf^t condition. 



Although the anterior legs are wanting in this specimen, there can, 

 I think, be no doubt of its generic position. 



4. Thalassina anomala (Herbst). 



To this species probably belongs a female of rather small size 

 from Thursday Island, obtained in the mangrove-swamps (No. 124). 



In this specimen the chelipedes are of nearly equal size, and both 

 chelae are as slender and as much elongated as is the smaller chela 

 in the adult T. anomala, and are strongly spinulose on their upper 

 margins. 



The examination of this specimen induces me to regard certain small 

 examples (of both sexes) from Borneo, Singapore, and the Indian 

 Ocean which I formerly * 'referred to f. anomala, and which have 

 a more broadly triangulate rostrum, and the upper margins of the 

 wrists and hands of the chelipedes armed with much smaller spinules 

 along their upper margins, as probably referable to a distinct species. 

 White's T. talpa, however, is, as I have already stated, probably a 

 young T. anomala. 



To the localities mentioned in my paper referred to above is to be 

 added Nicol Bay, N.W. Australia, whence the Museum possesses a 

 small mutilated example (M. du Boulay). 



Perhaps the species described by Hesst from Sydney as T. max- 

 ima is to be regarded merely as a variety of T. anomala. 



* Ann. & Mag. Nat. Hist. ser. 5, v. p. 377 (1880). 



t Arohiv f. Naturgesohichte, xxxi. p. 163, pi. fii. fig. 18 (1865). 



m 



