100 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Porcellana macrocheles, Poeppig, 1836, p. 142, pi. 4, fig. 1 (type local- 

 ity, Bahia de San Vicente, Chile). 



Petrolisthes violaceus, Stimpson, 1858, p. 227. Targioni-Tozzetti, 

 1872a, p. 398; 1872b, p. 470; 1877, p. 219, pi. 13, figs. 2, 2a-h. 

 Henderson, 1888, p. 105. Cano, 1889, pp. 96, 99, 100, 257. Ort- 

 mann, 1892, p. 259; 1897, p. 277. Murray, 1895, p. 1120. Lenz, 

 1902, p. 745. Porter, 1903, p. 150; 1906, p. 132; 1917, p. 97; 

 1925, p. 320; 1936b, p. 153; 1936c, p. 339; 1940a, p. 147; 1940b, 

 p. 313; 1941, p. 460. Rathbun, 1910, p. 599. Doflein and Balss, 

 1912, p. 34. Haig, 1955, pp. 42, 44. 



Previous records: 



Peru. Callao: J. R. Kinahan (Kinahan) ; Vettor Pisani (Cano). San 

 Lorenzo; Ancon: Vettor Pisani (Cano). Islas de Chincha: J. R. 

 Kinahan (Kinahan). Middle Chincha Island: J. Steevens (Kina- 

 han). 



Chile. "Chile": (Guerin 1835) ; (H. Milne Edwards) ; (H. Milne Ed- 

 wards and Lucas) ; T. Bell (White) ; Ackermann (Ortmann 1892). 

 Iquique: J. Bermiidez (Porter 1903). Cavancha: L. H. Plate 

 (Lenz). Province of Antofagasta: J. Herrera (Porter 1940a). 

 Bahia de Taltal: A. Capdeville (Porter 1925). Caldera: E. Gi- 

 goux (Porter 1940a). Peninsula Coquimbo: Lund Univ. Chile 

 Exped. (Haig). Coquimbo: F. T. Delfin (Porter 1903). Bahia 

 Herradura de Guayacan: Lund Univ. Chile Exped. (Haig). Herra- 

 dura: F. T. Delfin (Porter 1903). Los Vilos: J. N. Thomas 

 (Porter 1906). Bahia de Valparaiso: U. S. Expl. Exped. (Dana). 

 Valparaiso: Magenta (Targioni-Tozzetti) ; Challenger (Hender- 

 son) ; Vettor Pisani (Cano) ; Guerin collection (Ortmann 1897). 

 San Antonio: Lund Univ. Chile Exped. (Haig). Province of 

 Concepcion: (Nicolet). Tumbes: L. H. Plate (Lenz). Talcahuano: 

 Coquille (Guerin 1838a); L. H. Plate (Lenz); F. T. Delfin 

 (Porter 1903). Bahia de San Vicente: E. Poeppig (Poeppig); 

 Lund Univ. Chile Exped. (Haig). Puerto Montt; Isla Tenglo: F. 

 Lau (Doflein and Balss). Chiloe; Chonos: Vettor Pisani (Cano). 

 Taitao: Mus. Nac. Chile Exped. (Porter 1917). 



Diagnosis: Carapace smooth, very strongly convex front to back; 

 no epibranchial spine; front broadly triangular; orbits without a con- 

 cavity, forming a nearly straight line with front to outer orbital angle; 

 carpus one and a half to less than two times as long as wide, anterior 

 margin with a proximal lobe, margins converging distally from its 



