PART 1 GARTH : PACIFIC OXYRHYNCHA 287 



superior length of the propodus. Fingers with a narrow gape along their 

 basal third ; prehensile edges crenate. 



Meri of ambulatory legs with a short spine; spine decreasing in size 

 and acuteness from the first to the fourth pair, there becoming a blunt 

 lobiform prominence. (Rathbun, 1898, modified) 



Material examined: The type series, from northeast of Indefatigable 

 Island, Galapagos, Lat. 0° 29' S, Long. 89° 54' 30" W, 392 fathoms, 

 April 15, 1888, Albatross station 2818, 5 males and 2 females, including 

 the ovigerous holotype, U.S.N.M. No. 21572. None from among Han- 

 cock collections. 



Measurements: Ovigerous female, holotype: length 50.2 mm, width 

 exclusive of spines 20.2 mm, rostrum 26.5 mm, length of branchial spine 

 9.0 mm. Male: length 35.9 mm, width exclusive of spines 14.5 mm, 

 rostrum 17.8 mm, length of branchial spine 6.2 mm. 



Color in life: Unknown. 



Habitat: Sand; Globigerina ooze. (Rathbun) 



Depth: 392-633 fathoms. 



Remarks: Through the courtesy of Dr. F. A. Chace, Jr., curator of 

 marine invertebrates, U. S. National Museum, a male paratype was 

 made available for dissection. Although crushed, the specimen yielded the 

 pleopod from which the accompanying sketch (Plate Q, fig. 6) was 

 made. The dissimilarity of this pleopod to that of Rochinia vesicularis 

 suggests that the genus Rochinia, as presently constituted, may be 

 diphyletic, including species which are related to Scyra and Chorilia 

 on the one hand, and to Pisoides and Pelia on the other. 



Rochinia occidental is (Faxon) 

 Plate Q, Fig. 7 



Anamathia occidentalis Faxon, 1893, p. 150; 1895, p. 8, pi. 1, figs. 2, 2a. 

 Rochinia occidentalis, Rathbun, 1925, p. 220, pi. 228; pi. 229, fig. 5. 



Type: Male holotype, M.C.Z. No. 4479, length without rostral 

 horns 45 mm, width 38 mm, rostral horns 12 mm. 



Type locality: Off the Galapagos Islands, Lat. 1° 03' S, Long. 

 89° 28' W, 385 fathoms, Albatross station 3404. 



Localities subsequently reported: Known only from the type locality, 

 above. 



Atlantic analogue: None. A Galapagos endemic species. 



Diagnosis: Four median and four gastric spines. Rostral horns awl- 

 shaped, divergent, rostrum over one-fourth carapace length. Branchial 

 spine largest, over half as long as rostral horn. One spine on outer mar- 



