THE CANCROID CRABS OF AMERICA 173 



Measurements. — Male (Puerto Harris), length of carapace 26.2, 

 width of same 29.3 mm. 



Range. — From Taicahuano, Chile, to the Falkland Islands. 



Material examined. — 



CHILE. — Taicahuano: 1 male, 2 young (M.C.Z.). January 15, 

 1927; W. L. Schmitt; 2 males, 1 female, 3 young (61995). 



Corral; Januaiy 20, 1927; W. L. Schmitt; 2 males, 2 females, 6 

 1927; young (61992). 



San Carlos, Chiloe Island; 1 female (M.C.Z.). 



Port Otway (now Port Barroso); February 9-10, 1888; Albatross; 

 3 males (1 is holotype), 11 females (21589). 



Eden Harbor, Smith Canal: 30 males and females (M.C.Z.). 

 Paessler collector; 1 female (43316), received from Munich Mus. 



Latitude Cove; February 6, 1888; Albatross; 4 males, 



1 female (22053). 

 Mayne Harbor; 3 males (M.C.Z.). 

 Puerto Harris, Dawson Island; February, 1921; 



Exped. Facult. Ciencias; 4 males, 2 females; lent by 

 Buenos Aires Mus. (12710). 



FALKLAND ISLANDS.— Teal Inlet; AprU 2-4, 

 1927; W. L. Schmitt; 1 young female (61996). 



Port Stanley; April 16, 1927; W. L. Schmitt; 2 males, 



2 females (60841). 



Figure 28.— Acan- 

 ACANTHOCYCLUS HASSLERI Rathbun thocyclus hass- 



LERI, MALE AB- 



Plate 76, Figure 1 domen, x2 



Acanthocyclus hassleri Rathbun, Proc. U. S. Nat. Mus., vol. 21, 



1898, p. 599, pi. 43, fig. 1 (abdomen) (type-locality, Valparaiso; holotype, 

 Cat. No. 4889, M.C.Z.).— Lenz, Zool. Jahrb., suppl. 5, vol. 2, 1902, p. 754; 

 Cavancha. 



Description. — See page 171. In small specimens the rim of the 

 median frontal tooth has a tendency to divide in the middle. 



Measurements. — Male holotype, length of carapace 16, width of 

 same 18.6 mm. Male (3265), length 12, width 13.9 mm. Male 

 (Cavancha), length 22, \\T.dth 25 mm. (Lenz). 



Range. — Panama to Valparaiso, ChUe. 



Material examined. — Panama; John M. Dow; 2 males, 1 female 

 (3265). Valparaiso; Hassler Exped. ; 1 male holotype (4889, M.C.Z.). 



Genus CORYSTOIDES Milne Edwards and Lucas 



Corystoidcs Milne Edwards and Lucas, d'Orbigny's Voy. I'Amer. M4rid., vol. 

 6, pt. 1, 1844, p. 31; type, C. chilensis Milne Edwawls and Lucas. — A. 

 Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., vol. 47, 1923, 

 p. 307. 



Carapace longer than broad, convex, dentate on the sides and 

 rounded posteriorly, somewhat truncate anteriorly. Front little 



