RRACHYDRA. RATHRUN. 131 



Platypus Bay, Queensland, 5-9 fathoms; E.3108; one 

 young male, half grown, carapace very pubescent, largely 

 obscuring the granules. 



Southern Queensland ; E.3138 ; one very large male, 84.7 

 mm. long, 165.8 wide; granules of carapace distant, 

 pubescence scanty, one small specimen of Balanidae 

 encrusting. P. 3539 ; one large male, 72 mm. long, 149 wide; 

 granules higher and a little more numerous than in E.3138, 

 partly obscured by pubescence. 



CHARYBDIS (CHARYBDIS) NATATOR (Herbst). 



Charybdis (Goniosoma) natator, Alcock. Journ. Asiat. 

 Soc. Bengal, Ixviii., 1899, p. 61 [529], and synonymy. 



Seven miles south-south-east of Double Island Point, 

 Queensland, 32-33 fathoms; E.2036; one male. Front 

 deformed, second of the eight frontal teeth (counting from 

 the left) somewhat reduced, sixth tooth showing only a 

 very short stump ; distal tooth of outer row on top of 

 major manus wanting. 



Platypus Bay, Queensland, 5-9 fathoms; E.3110; one 

 female. 



CHARYBDIS (CHARYBDIS) INCISA", sp. nov. 

 (Plate xxxiii.) 



Type-locality. Off Point Inskip, Great Sandy Strait, 

 Queensland, 10 fathoms ; E.3151 ; one ovigerous female, 

 holotype. 



Measurements. Female holotype, total length of cara- 

 pace 17.3, extreme width 26, width at base of spine at 

 lateral angle 23, fronto-orbital width 18, width between 

 orbits 10.2 mm. 



Description. Belongs to the subgenus Charybdis, in 

 which the antennal flagellum is excluded from the orbit, 

 the ridge that bounds the dorsum posteriorly forms a curve 

 with the postero-lateral borders, the posterior border of the 

 arm lacks a spine, and to that division of the subgenus in 

 which there are no distinct ridges on the carapace behind 

 the level of the last spine of the antero-lateral borders. 



17 Incisus, cut ill to, referring to the cut into the first lateral tooth 

 to form the second. 



