68 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



obliquely elongate tubercles; posterior margin with a crest formed of 

 large oblique rugae, and ending distally in a large, strong tooth. Manus 

 with a thin outer margin; gape with a short pubescence, confined to 

 proximal half of fingers. 



Walking legs rugose, all segments thickly covered with plumose 

 hairs. Merus unarmed, that of leg 3 slightly inflated. 



Material examined: Bahia de San Juan, Peru, shore; February 

 8, 1938; Felero III station 828-38; one male. 



Peninsula Coquimbo, Chile, shore; June 24, 1949; Lund Univer- 

 sity Chile Expedition station M127; one male (Allan Hancock Foun- 

 dation, gift of H. Brattstrom). 



Valparaiso, Chile; date and collector unknown; three dry specimens 

 (Academy of Natural Sciences of Philadelphia Cat. No. 3578). 



Talcahuano, Chile; April, 1872; Hassler Expedition; 12 males, 15 

 females (one ovigerous) (Museum of Comparative Zoology Cat. No. 

 7954). 



Measurements: Males, 11.5 to 22.9 mm; non-ovigerous females, 

 11.0 to 25.7 mm; ovigerous females, 13.3 to 16.5 mm. The last meas- 

 urement was of an ovigerous female collected by the Hassler, examined 

 previously but not seen in connection with the present report. In his 

 description of Porcellana tuberculosa, H. Milne Edwards gave the 

 length of specimens as about 8 lines (18 mm). A 14 line (29.6 mm) 

 specimen, the largest on record, was taken by the U. S. Exploring Ex- 

 pedition and reported by Dana (1852). 



Color: Not recorded. Preserved specimens are reddish brown to 

 pale buff. 



Ecology: In the littoral, under stones. Ovigerous females were col- 

 lected in April by the Hassler. 



Remarks: The nomenclature of this species has been considerably 

 confused. It was originally described by Guerin (1835) as Porcellana 

 afflnis, and redescribed two years later by H. Milne Edwards (probably 

 from the same specimens) as Porcellana tuberculosa. Guerin (1838b), 

 in his full report on the porcellanids briefly characterized by him in 

 1835, accepted H. Milne Edwards's name for the species because his 

 own Porcellana affinis was preoccupied by Porcellana affinis Gray, 

 1831. 



H. Milne Edwards and Lucas (1843) created the new name Por- 

 cellana tuberculifrons for this species, placing P. affinis Guerin in syn- 



