CORYSTOIDEA. 305 



Length of carapax, one inch and eleven lines ; breadth, one inch 

 and ten lines; ratio of length to breadth, 1 : O99. 



Corystes sicarius, PffiPPiG, Wiegm. Arch., 1836, 139. 



Pseudocorystes armatus, EDWARDS, Crust., ii. 151 ; LUCAS, D'Orb. S. A. Crust., p. 

 30, pi. 15, f. 2. 



Pseudocorystes sicarius, A. WHITE, Catalogue of Crust., Brit. Mus., 1847, 53. 



GOMEZA SERRATA. 



Carapax subovatiis, scabrosus, breviter hirsutus, rostro apicem truncate, 

 margins prope apicem utrinque inciso, lateribus acute~ 5-serratis, serra- 

 turd 4td fere mediand, quoque subtilissime denticulatis. Pedes mar- 

 ginibus pubescentes. 



Carapax subovate, scabrous and short hirsute, beak truncate at apex, 

 and the margin near the apex either side incised ; the sides acutely 

 five-serrate, the fourth serrature being near the middle of the 

 margin, also minute denticulate. Feet with the margins pubescent. 



Off the coast of Patagonia, in fifty fathoms water. Lieut. Case. 



Plate 18, fig. 7 a, animal, enlarged eight diameters ; b, view of ex- 

 tremity of beak, more enlarged ; c, under view, showing antennas and 

 mouth. 



Length of carapax, one and a half lines. The extremity of the 

 beak is cut square off, but has a sinuous apical margin, and either 

 side, just at the angle, there is a longitudinal incision, separating a 

 very narrow and acute lobe ; the margin of the beak behind this is 

 minutely denticulate. The five teeth of the margin are D, E, N, T, 

 S, or the normal teeth; and the markings of the surface show that 

 the medial region extends far back of the middle, as shown by the 

 teeth. The eyes are on rather short pedicels, and are directed straight 

 outward. The flagellum of the outer antennae consists of nine or ten 

 joints, and has a few short hairs; the whole length beyond the carapax 

 is not one-third the length of the carapax. The outer maxillipcds 

 are short hirsute, and the two do not quite meet on the medial line. 

 The third joint is subquadrate, not at all oblong, with the anterior 



77 



