47 

 Dromi'i unidenfata, Riippell. Plate II., fig. 6. 



Dromia unidentata, Kuppell, 2-t Krabben rotli. Meer., p. 16, pi. iv. fijr. 2, pi. xi. fif?. 9- H. Milne Edwards (79), 

 A. Milne Edw.irds {72J, Hilgendorf (45), Muller{81), Alcock (3). Dmmidia unidentata, Kosaraann (51), .le 

 Man (25), Cano (15), Heuderson (43), Ortmann (83). 



For references see J. A. S. B., LXVIII., pt. 2, 1899, p. 139. 



Carapace about as long as broad, strongly convex, with some dimples when 

 denuded, two of which, separating the post-gastric from the branchial regions, 

 are specially conspicuous. Cervical groove well marked. 



Front cut into two broadish Init sharp teeth, between which, but on a voiy 

 much lower plane, is an extremely inconspicuous denticle. 



A broad tooth near the middle of the upper border of the oi-bit. Outer 

 orbital angle prominent but not dentiform. Suborbital lobe bluntly dentiform, 

 but not prominent. 



Antero-lateral borders entire, rather sharp. A slight projection, hardly 

 amounting to a tooth, on the postero-lateral border, immediately behind the 

 branchial or " cervical " groove. 



Chelipeds smooth, except for two tubercles at the far end of the outer 

 surface of the wrist. 



The fourth (last) pair of legs are not so very much shorter than either of 

 the first two pair and are very much longer than the ord pair. The propodites 

 of the last two pair are broader than long and are very spiny, one of the spines 

 in the case of the last pair being at least as long as the spine against which the 

 claw-like dactylus closes — so much so, that the last pair of legs appear to end in 

 o claw-like spines the middle one being the dactylus. 



The abdomen of the male, when denuded, has a broad convex ridge down 

 the middle line ; but when not denuded, the terminal segments of the male 

 abdomen form with the basal joints of the chehpeds and first two pair of, legs a 

 remarkably fiat surface, owing to the abrupt angular bending up of the last three 

 abdominal segments. 



The sternal grooves of the female approach one another closely, but do not 

 actually meet, on the segment of the sternum corresponding with the 1st pair of 

 monodactylous (ambulatory) legs, near the anterior end of which segment they 

 terminate, but without tubercles. 



No epipodites on the chelipeds. 



The carapace of the largest specimen is 24 millim. long, and 22*5 millim. in 

 greatest breadth. 



In one of the male specimens, in which the vasa deferentia are, as usual, 

 wonderfully prominent, there are also openings in the basal joints of the ante- 

 penultimate pair of legs, corresponding with the genital openings of the female. 



