THE CANCROID CRABS OF AMERICA 161 



Hypopeltarivm spinulosum Miers, Challenger Rept., ZooL, vol. 17,1886, p. 211; 



(Chiloe, etc.). 

 Hypopeltarion spinulosum Ortmann, Zool. Jahrb., vol. 7, Syst., 1893, p. 421. — • 



Lbnz, Zool. Jahrb., Suppl. 5, vol. 2, part 3, 1902, p. 758. 



Diagnosis. — Carapace as broad as long or nearly so. Chelipeds sub- 

 equal. Third, fourth, and fifth segments of male abdomen fused. 



Description. — Carapace suborbicular, broader than long, or some- 

 times longer than broad in the young and half grown; covered with 

 crowded, unequal granules, most prominent on posterior part, and 

 becoming lower and less apparent with age. Lateral teeth 4 or 5 

 besides the orbital tooth; 3 are antero-lateral, the tliird being at the 

 widest part of the carapace; one, and sometimes two, are postero- 

 lateral. Median tooth of front narrow, gradually diminishing to a 

 bidentate tip; lateral teeth slender, about half as long as median and 

 longitudinally placed. Cornea black. Basal article of antenna less 

 advanced than suborbital tooth; next two articles stout. Merus of 

 outer maxilliped equal in its greatest width to distal end of ischium, 

 distal half of margin spinulous. Upper margin of chelipeds spinous, 

 surface rough mth stout, sharp spinules which become tubercles or 

 granules in the old and which form about 5 longitudinal rows on outer 

 surface of palm. Fingers compressed, subtriangular, narrowly gaping. 

 Legs spinulous above, especially on carpus and propodus, the former 

 with a longitudinal row of spinules on outer surface in the first three 

 pairs, and two rows in the last pair; dactyli long and slender. Ambu- 

 latory legs fringed with long silky hair, also upper margin of chelae, 

 lower surface of carapace and sternum and margins of abdomen and 

 maxilliped. Terminal segment of male abdomen slightlj^ longer or 

 shorter than breadth, and deeply invaginated in the preceding seg- 

 ment. 



Color. — Above red spotted with wliite, beneath entu'ely wliite 

 (White). 



Measurements. — Male (61098), length of carapace 50, width of same 

 52.6 mm. Male (22061), length of carapace 37.2, width of same 

 36 mm. 



Range. — From Uruguaj' by way of the Straits of Magellan to the 

 Island of Chiloe, Chile. Bay, of Valparaiso (Nicolet). Falkland 

 Islands. Shallow water to 77.5 fathoms. 



Material examined. — See table, page 162. 



PELTARION DEXTRUM (Rathbun), new combination 



Plate 69, Figure 3 



Hypopeltarium dextrum Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 4, 

 1898, p. 277, pi. 6, fig. 2 (type-locality, oflf^Cozumel, Yucatan, 231 fathoms; 

 Cat. No. 9558, U.S.N.M.). 

 79856—30—12 



