PART 1 GARTH : PACIFIC OXYRHYNCHA 339 



Atlantic analogue: The species itself occurs in the South Atlantic. 



Diagnosis: Carapace depressed, tuberculate, regions well delineated. 

 Palms inflated ; ambulatory legs shorter than in the companion species, 

 Leurocyclus gracilipes ; meri enlarged, superior basal spines inconspicu- 

 ous ; propodi of last three pairs densely pubescent. Male first pleopod not 

 examined. 



Description: Carapace decorated above with tubercles and with fine 

 granulations. Hairs of a clear fawn color, short and not very close-set, 

 visible in the furrows separating the regions. Rostrum finely granulated 

 above for its entire length, as is the superior and internal margin of the 

 orbital cavities. Chelipeds having their merus decorated with several 

 longitudinal rows of projecting granules, sometimes even taking the form 

 of more or less spiny tubercles; their carpus more finely granulate and 

 with a rounded crest ; the manus greatly swollen and with fine granu- 

 lations mixed here and there with some spiny tubercles ; the fingers elon- 

 gate, smooth, slightly curved, and finely serrated. Basis and ischium of 

 ambulatory legs granulate, with the superior margin of the ischium 

 armed with a very pronounced spine; merus entirely covered above with 

 projecting granulations, among them very pronounced spines, especially 

 in the first and second pairs ; below, these same articles nearly smooth, 

 especially in the third and fourth pair of legs. Carpus with several gran- 

 ulations on its external surface, and the other parts entirely smooth ; the 

 propodus decorated on its external surface with several longitudinal lines 

 of fine granulations ; finally, the dactylus strongly channeled and a little 

 flattened; a slight swelling apparent near the base of the clear brown 

 nail. Sternal plastron very finely granulate. (Milne Edwards and Lucas, 

 modified) 



Material examined: None. Through the courtesy of Dr. F. A. 

 Chace, Jr., of the U. S. National Museum, a pair of the companion 

 species, Leurocyclus gracilipes (A. Milne Edwards and Bouvier), from 

 off Rio de la Plata, Argentina (U.S.N.M. No. 21907), has been made 

 available to the writer. A sketch of the pleopod of this species is repro- 

 duced (Plate T, fig. 9) in lieu of that of L. tuberculosus. 



Measurements: Largest specimen recorded, a male from Chile: 

 length 60 mm, width 71 mm. (Brito Capello) 



Color: Yellowish white. (Milne Edwards and Lucas) 



Depth: Not recorded. The companion species, Leurocyclus gracilipes, 

 occurs in the Atlantic in 10.5-30 fathoms. 



Remarks: Verification of Chile as the probable type locality is found 

 in the two Verreaux specimens reported by Brito Capello. Otherwise 



