PART 1 GARTH : PACIFIC OXYRHYNCHA 85 



two occasions (Garth, 1946, p. 375; 1948, p. 24). The choice of the 

 Bay of Panama as the newly designated type locality is based upon the 

 known range of the species, phis the fact that Hugh Cuming, who 

 obtained the nonextant holotype, is known to have made collections at 

 Taboga Island and at Saboga Island, Perlas Islands (Carpenter, 1857, 

 p. 179). 



Genus PYROMAIA Stimpson 



Pyromaia Stimpson, 1871b, p. 109. A. Milne Edwards, 1879, p. 197. 



Rathbun, 1925, p. 127. 

 Apiomaia von Martens, 1873, p. 182; name substituted for Pyromaia. 

 Miers, 1879c, p. 651. 



Type: The Atlantic Pyromaia cuspidata Stimpson, 1871, by mono- 

 typy. 



Description: Carapace pyriform, convex, rough with tubercles and 

 spines ; rostrum simple, well developed ; supraorbital spine usually 

 present; postorbital spine large, distant from the ocular cavity, and 

 curved around end of eye, tip directed forward. Basal article of outer 

 antennae long and narrow, tapering anteriorly; movable portion very 

 slender. Epistome a little wider than long. Buccal cavity not completely 

 filled by the outer maxillipeds; ischium with its inner distal portion 

 strongly advanced ; merus cordate, with a prominent narrow lobe on 

 the inner side. Chelipeds of moderate length, merus triangulate, manus 

 swollen, fingers long and curving inward. Ambulatory legs very long 

 and slender, cylindrical, decreasing successively in length from first to 

 fourth pair; dactyli long and slightly curved. 



Abdomen of male with the last two segments, of female with the 

 last three segments, fused. (Rathbun) 



Range: From Tomales Bay, Marin County, California, to Cape 

 Corrientes, Colombia, including the Gulf of California; in the Atlantic 

 from Cape Lookout, North Carolina, through Florida Strait to Yucatan 

 Channel. Shore to 225 fathoms. The single Pacific species is not strictly 

 analogous to either of the Atlantic forms, being intermediate in some 

 respects between them and Inachoides. 



Pyromaia tuberculata (Lockington) 



Pyromaia tuberculata mexicana (Rathbun), new combination 

 Plate E, Fig. 7 ; Plate 6, Figs. 1, 2 



Inachus tuberculatus Lockington, 1877a, p. 30. Miers, 1886, p. 19, 

 footnote. 



