117 



(2) besides the orbital and post-antennal spines, there are on either side an 

 hepatic, an epibranchial, and a small post-orbital spine — the two latter being 

 acute endings of well marked carinas ; and, on the strongly pronounced mid- 

 dorsal carina, 2 gastric spines and a cardiac spine : 



(3) the eyes are not set very obliquely on the stalks and are much smaller : 



(4) the antennular peduncle reaches little more than a third the way along 

 the antennal scale. 



Colours in life clouded purple, eyes milky orange. Length of carapace 18 

 millim., of abdomen 47 millim., measured in the middle line. 



Bay of Bengal 1748 and 1997 fathoms. 



-r, ] at 6741-6742 



nea:a. Nos. — =- — . 



° 9 



Aegeon, (Risso) Guerin-Meneville, Stebbing. 



Egeon, Risso, Hist. Nat. Crust. Nice, p. 99. (Type E. loricatus, Riss. = .E. eataphractus, Oliv.). 



Aegeon, Gue'rin-MeneWHe, Exp. Sei. Moree (apud Stebbing) : Kinahan, Proc. Roy. Irish Acad. VIII. 1864, 

 p. 74 : Cams, Prodr. Faun. Medit. I., p. 483 : Stebbing, Marine Investigations in S. Africa, Crustacea, p. 50 

 (ubi synon.). 



Pontocaris, Spence Bate, Challenger Crustacea Macrura, p. 495 : Ortmann, Proc. Acad. Nat. Sci. Philad. 1895, 

 p. 175. 



Having dissected a specimen of Aegeon cataphmr.tus (the type of the genus) 

 I must give my unqualified support to Mr. Stebbing's synonomy. 



Integument very hard and thick. 



Rostrum short, depressed. Carapace broad, its anterolateral angles pro- 

 duced, longitudinally multicarinate, the carina? being usually seven in number, • 

 namely, a median, and on either side a dorsal, a lateral, and a supra-marginal. 



Abdomen not compressed, its terga and pleura sculptured, the pleura being 

 of moderate breadth fore and aft, and being more or less produced in a vertical 

 direction. The first 5 abdominal sterna with a strong median spine. 



Eyestalks short ; eyes of moderate size. Antennules distinctly dorsal of 

 the antennae, the basal joint of the peduncle is dorsally concave, and its scale, 

 though acute, is broad and squamiform : antennular flagella short, the outer one 

 in the male is in part foliaceous and vastly broader than the inner one, but in 

 the female both are cylindrical and of nearly equal thickness. Antennal scale 

 broadly foliaceous. 



The flagella of the exopodites of all the maxillipeds are bent strongly 

 inwards. The first pair of thoracic legs are like those of Pontophilus, but have 

 a short setose exopodite. The 2nd pair, which are slender and chelate, are of 

 variable length even sometimes in the different sexes of the some species. The last 3 

 pairs of thoracic legs are as in Pontophilus, the dactyli of the last 2 pairs being 

 sometimes so much vertically-compressed as to be almost palinulate. 



