280 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 18 



Epistome slightly conical anteriorly. 



Maxillipedal palp article 4 simple apically. 



Gnathopod 1 : article 5 slender, longer than 6, the latter well 

 expanded, palm nearly transverse. Ratio of lengths of articles 5 and 6: 

 Gnathopod 1 = 25:22, Gnathopod 2 = 1 :1 (23:23). 



Peraeopod 3 : articles 4-5 very slender, articles 5-6 subequal in length. 

 Ratio of widths of articles 2, 4, 5, 6 == 23:17:17:7. 



Peraeopod 4 slender, articles 4-5 equal in length, article 6 longer 

 than either. Ratio of widths of articles 2, 4, 5, 6 = 36:18:16:7. 



Peraeopod 5 : article 2 broadly expanded, ratio of width to length is 

 49:51, sweep point at base of article 3, lower edge broadly convex, 

 posterior edge with 9-10 minute teeth; article 6 much longer than either 

 4 or 5. 



Uropods 1 and 2: rami shorter than peduncle, the outer rami of 

 both uropods with numerous small spines, inner rami with a few large 

 spines; the medial and lateral edges of the peduncle of uropod 1 also 

 have dissimilar spine rows ; peduncle of uropod 2 with large spines ; apices 

 of rami with movable spine. Note that the inner ramus of uropod 2 

 bears spines, unusual in the genus. 



Uropod 3 : inner ramus about two thirds as long as outer, article 

 2 of outer ramus about one fifth as long as article 1 ; inner ramus rather 

 setose for a female. 



Telson very broad, apices truncate, each with a larger and 2 

 minute spines, lateral edges with subapical notches about three-fourths 

 the length from the base, each bearing 2 spines. 



Third epimeron: posterior edge nearly straight, slightly produced 

 at lower corner, but with a long, nearly parallel margin below the 

 lower corner sweeping onto the lower edge ; setae sparse. 



Male.— See Schellenberg 1931. 



Remarks. — Schellenberg identified his South American specimens 

 with the Australian P. villosa (Haswell). I have been able to examine 

 some of Schellenberg's specimens and have compared them with notes of 

 the type of P. villosa supplied by Dr. Sheard. The comparison demon- 

 strates that the South American "villosa" is a distinct species (see notes 

 below). 



In 1932 Dr. K. H. Barnard erected P. sinuata, the brief description 

 and figures of which fit Schellenberg's "villosa." Thus, P. sinuata takes 

 priority as the valid name. 



Notes on identification. — The following differences are considered by 

 me sufficient to warrant specific rank for South American "villosa" 



