Boone, Crustacea, Cruise of ''Alva," 1931 95 



orbital border. The anterolateral margin is sharply crested with faint 

 indications of three closed incisions, marking the margin into three 

 successively broader teeth, with a distinct blunt ridged tooth at the 

 postlateral angle. The sidewalls of the carapace are smooth, as is also 

 the sternal plastron. The male belt is five-jointed. The female belt is 

 wider, suboval. 



The antennulae fold almost transversely and are separated by a 

 strong intermedian septum. 



The antennae have the basal article broad, the inner angle meeting 

 the downbent frontal border and the outer angle not extending as far 

 as the inferior orbital angle ; the second and third antennal joints are 

 cylindrical, successively smaller and lie within the orbital sinus; the 

 flagellum is long and slender, about three-fourths as long as the long 

 diameter of the orbit. 



The external maxillipeds are close fitting, glabrous, devoid of setae 

 except the brush on the inner lateral margin of the ischium. 



The ehelipeds are equal in both sexes ; the merus compressed, with 

 the upper lateral margin decidedly earinate, as is also that of the pro- 

 podus ; the carapace is smooth, convex ; the palm is smooth on the outer 

 surface, both fingers are longitudinally grooved externally, the cutting 

 edges irregularly dentate ; larger males have an inferior large molar, 

 that is absent in females and small males. 



The ambulatories have the merus, carpus and propodus flattened, 

 and their upper lateral margins crested; the dactyl is tipped with a 

 sharp tooth and is covered on the dorsal and ventral surface with im- 

 bricated chitinous scales interspersed with long spinose setae. 



References : Cancer floridus Rumphius, Amboinsch. Rariteitk. p. 16, 

 pi. 8, fig. 5, 1781.— LiNNE, Syst. Nat. Ed. 12, p. 1041, 1767. 



Cancer ocyroe Herbst, Naturg. Krabben u. Krebse, Bd. Ill, ser. 2, pi. 

 20, fig. 2, 1790-1804.— H. M. Edwards, Hist. Nat. Crust, t. I, p. 

 275, 1834. 



Atergatis floridus De Haan, Faun. Japon. Crust., p. 46, 1837. — 

 Krauss, Sudafr. Crust, p. 27, 1843.— Dana, U. S. Explor. Ex- 

 ped. Crust, vol. XIII, pt. I, p. 159, 1852; atlas, pi. 7, fig. 4, 

 1855, issued 1861. — Stimpson, Proc. Acad. Nat. Sci. Phila., vol. X, 

 p. 32, 1858. — Heller, Reise Osterreich. Fregatte "Novara" Zool. 

 Bd. II, Abthl. Ill, p. 8, 1882.— A. Milne Edwards, Nouv. Archiv. 

 Mus. Hist. Nat. Paris, 1. 1, p. 243, lS6o.— Ibid., t. IX, p. 186, 1873.— 

 TozzETTi, T., R. Inst, di Studi Superior Magenta Crost., p. 24, 

 1877.— Miers, Proc. Zool. Soc. London, 1877, p. 183 ; Ann. Mag 



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