44 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Description: Carapace with fine transverse plications, cardiac and 

 metabranchial regions punctate; covered with a fine pubescence. Front 

 triangular, with a deep median sulcus; a strong supraocular spine. 

 Outer orbital angle produced into a small spine. A single small epi- 

 branchial spine. 



First movable segment of antenna with a large, spine-tipped tooth 

 on anterior margin; second rugose, anterior margin granular; third 

 nearly smooth ; flagellum naked. Outer maxillipeds rugose. 



Merus of chelipeds rugose, with a large, serrate-edged tooth on 

 anterior margin. Carpus finely pubescent, about twice as long as wide; 

 anterior margin armed with four or five broad, serrate-edged teeth 

 similar to meral tooth; surface granulate, with a median longitudinal 

 crest formed of large, obliquely elongate, flattened tubercles; posterior 

 margin with a row of rugae produced into spines. Manus finely pub- 

 escent, broad, flattened, covered with small flattened tubercles usually 

 produced into spinules on outer margin. Fingers covered with similar 

 tubercles; gape with a short, thick pubescence. 



Walking legs rugose; anterior margins of merus and carpus with a 

 fringe of plumose hairs, all segments covered with tufts of non-plumose 

 setae; anterior margin of merus of leg 1 with six to ten spines, of leg 

 2 with six to eight, of leg 3 with one to six ; merus of legs 1 and 2 with 

 one or two posterodistal spines. 



Ventral surface of chelipeds and walking legs with rugae and flat- 

 tened granules; abdomen smooth. 



Material examined: Peru; November 17, 1866; H. Edwards, col- 

 lector; two males (Museum of Comparative Zoology Cat. No. 7971). 



Valparaiso, Chile; April, 1941 ; one male, one female (U. S. National 

 Museum Cat. No. 81902). 



Coronel, Chile, 8-9 fms. ; December 30, 1915; R. Paessler, collector; 

 one male, one female (Allan Hancock Foundation, gift of Hamburg 

 Museum) . 



Measurements: Males, 5.3 to 30.3 mm; non-ovigerous females, 17.9 

 to 33.0 mm; ovigerous females, 21.9 and 26.2 mm. These measurements 

 include specimens in the Hamburg Museum collection previously exam- 

 ined by the writer. The largest specimen seen, a 33 mm female from 

 Valparaiso in the collection of the U. S. National Museum, agrees with 

 the measurement of 33 mm length, 35 mm breadth given by H. Milne 

 Edwards and Lucas (1844) for the type of Porcellana acanthophora 

 from the same locality. 



