REPORT OH THE BRACHYURA. 
163 
Eriphia gonagra (Fabricius). 
Cancer gonagra, Fabricius, Entom. Syst., vol. ii p. 466, 1793; Suppl., p. 337, 1798. 
Eriphia gonagra, Milne Edwards, Hist. Hat. Crust., vol. i. p. 426, pi. xvi. figs. 16, 17, 1834. 
„ „ A. Milne Edwards, Crust, in Miss. Sci. au Mexique, pt. 5, p. 338, pi. xvi. 
fig. 4, 1880. 
Bermuda (a small adult male) : — 
Adult $ . Lines. Millims. 
Length of carapace, . . . . . . . 5 10 - 5 
Breadth of carapace, . . . . . . . 7 14 ’5 
Section II. Trapeziinse. 
Canceriens quadrilateres, Milne Edwards (pt.), Hist. Hat. Crust., vol. i. pp. 369, 424, 1834. 
Trapezides, A. Milne Edwards, Ann. d. Sci. Hat., ser. 4, Zool., vol. xviii. p. 41, 1862; Houv. 
Archiv. Mus. Hist. Hat., vol. i. p. 183, 1865. 
Carapace depressed and nearly quadrilateral, smooth, with the postero-lateral angles 
truncated, the dorsal regions not defined; the anterodateral margins are straight, form a 
right angle with the front, and are entire or have but one tooth (the lateral epibranchial 
tooth) developed. The front is horizontal, broad, lamellate, and projects over the 
antennules and bases of the antennae, which are widely excluded from the orbits. 
The genera comprised in this section are the following 
Trapezia, Latreille ( = Grapsillus, Tetralia, Dana. 
MacLeay). Quadrella, Dana . 1 
Trapezia, Latreille. 
Trapezia, Latreille, Fam. Hat. du Regne Animal, p. 269, 1825; Crust, in Regne Animal de 
Cuvier, ed. 2, vol. iv. p. 41, 1829. 
„ Milne Edwards, Hist. Hat. Crust., vol. i. p. 427, 1834. 
Grapsillus, MacLeay, Annulosa in Smith, Zool. South Africa, p. 67, 1838. 
The carapace is nearly quadrate, depressed, smooth, with the antero-lateral margins 
parallel, the posterodateral margins convergent backwards from the lateral epibranchial 
spine, which is not always developed, the regions on the dorsal surface are not indicated; 
the front projects beyond the orbits, and is divided into several lobes or teeth. The 
post-abdomen in the male is usually five-jointed. The short eye-peduncles are not con- 
cealed by the shallow orbits, whose margins are without fissures ; there is often a tooth or 
1 The Crustacean from Providence Island (19 fathoms), referred to without specific or generic designation in my 
Report on the Crustacea of H.M.S. “Alert” (Zool. Coll., p. 536, footnote, 1884), belongs to this rare genus, and is 
even perhaps identical with Dana’s species, Quadrella, coronata 
