THE CANCROID CRABS OF AMERICA 11 



of outer maxillipeds about as broad as long, obliquely truncate at 

 inner distal angle. Legs gressorial; dactyli nearly equal. Of small 

 size. Inhabits the west coast of South America; also Indo-Malaysian, 

 Japanese and Australian seas. 



GOMEZA SERRATA Dana 



Plate 1, Figures 4-6 



Gomeza serrata Dana, U. S. Expl. Exped., vol. 13, Crust., pt. 1, 1852, p. 305, 

 atlas, 1855, pi. 18, fig. 7a-c (type-locality, oflf Patagonia, 50 fathoms; type 

 not extant). — Miers, Proc. Zool. Soc. London, 1881, p. 68; Challenger Rept., 

 Zool., vol. 17, 1886, p. 212.— Lenz, Zool. Jahrb., Syst., vol. 2, Suppl. 5, 1902, 

 p. 754, pi. 23, fig. 6.— Porter, Revista Chilena Hist. Nat., vol. 22, 1918, p. 53. 

 text-fig. 3. 



Diagnosis. — Carapace scabrous, short hirsute, lateral margin 

 5-toothed, fourth tooth about at middle, teeth minutely denticulate; 

 rostrum truncate, margin near apex incised. 



Description. — Truncate margin of rostrum sinuous and either side 

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

 acute lobe; behind this the margin of the beak is minutely denticulate. 

 Lateral teeth of carapace except the first pointing obHquely forward. 

 Cardiac region far behind middle of carapace. Eyes on rather short 

 pedicels, directed straight outward. Length of outer antenna beyond 

 carapace not one-third length of carapace; flagellum with 9 or 10 

 articles and a few short hairs. Outer maxillipeds short hirsute, not 

 quite meeting on m.edian line; merus about half as long as ischium, 

 inner distal angle deeply truncate. Abdomen hirsute. Hand short; 

 fingers a little incurved, inner margin denticulate. Margins of legs 

 pubescent; dactylus slender, tapering; carpus and propodussubequal. 



Measurements.— Type (after Dana), length of carapace 3.1, width 

 at fourth tooth 2.5, fronto-orbital width 1.5, width of front just 

 anterior to inner orbital tooth 0.42 mm. Male (Lenz), size 4.5 mm. 

 Largest specimen (Miers), 10.6 mm. long. 



Range. — Callao, Peru, to Straits of Magellan, shallow water to 30 

 fathoms (Miers); off Patagonia, 50 fathoms (Dana). 



Genus PSEUDOCORYSTES Milne Edwards 



Pseudocorystes Milne Edwards, Hist. Nat. Crust., vol. 2, 1837, p. 149; type 

 P. armatus Milne Edwards. 



Carapace nearly oval, much swollen. Front narrow, advanced, 

 horizontal. Ocular peduncles of medium size, orbits shallow, quite 

 open exteriorly. Antennules small, completely covered above by the 

 front; the flagellum folds longitudinally. Antennae very large, 

 inserted under the eye in a hiatus of the orbital border; the gland at 

 its base is especially large. Buccal cavity quite open anteriorly and 

 prolonged laterally to the base of the outer antennae where it is hmited 

 by a large conical tooth which, along with the antenna, forms the 



