AMPHIPOD GENUS PARHYALE — SHOEMAKER 351 



corner. In uropods 1 and 2 the outer ramus is without lateral spines, 

 but has terminal spines. 



The female does not have the groups of plumose setae on the lower 

 margin of the fourth and fifth joints of the peduncle of the second 

 antenna. 



A number of specimens were taken in La Paz Bay, Lower California, 

 on May 2, 1921, by L. G. Rubio. 



Type: A male, USNM 96983, taken in La Paz Bay, Lower Califor- 

 nia, March 2, 1921, by L. G. Rubio. 



Parhyale hawaiensis (Dana) 



Figures 3, 4 



AUorchestes hawaiensis Dana 1853 and 18.55, p. 900, pi. 61, figs. 5a-h. 



Hyale brevipes Chevreux 1901, p. 400, figs. 15-18. 



Hyale hawaiensis Stebbing 1906, p. 573. 



Hyale (rifoliadens Kunkel 1910, p. 72, fig. 27. 



Hyale inyacka Barnard 1916, p. 233, pi. 28, fig. 4. 



Hyale hawaiensis Schellenberg 1938, p. 66, fig. 34. 



Hyaloides dartevellei Schellenberg 1939, p. 126, figs. 6-10. 



Parhyale hawaiensis is very much like P. fascigera, hut the differences 

 though slight are definite. P. hawaiensis is more spinose than P. 

 fascigera. 



Male: Head not as long as the first two body segments combined. 

 Eye pyi'iform and light brown in alcohol. Antennae are about the 

 same proportions as in P. fascigera (fig. 3,a); flagellum of antenna 1 

 with 15 to 17 joints, and that of antenna 2 with 24 to 29 joints. The 

 mouthparts are like those of P. fascigera and are as shown by figures 

 3,6-/. Some of the most distinguishing characters are in the 

 gnathopods. 



Gnathopod 1 : Second joint not quite so much expanded as in P. 

 fascigera; the sixth joint is rather oval and not so suggestive of a 

 triangle; the large spine of the palm of P. fascigera is not present, but 

 is replaced by a smaller spine which is nearer the hind margin of the 

 joint; the spine on the inner side of the defining angle has moved 

 down to the middle of the hind margin of the joint; the raised rasp- 

 ing portion of the defining angle is absent, but the minute rasping 

 teeth are present on the hind margin of the joint just below the de- 

 fining spine (fig. 4,6) ; the seventh joint fitting palm and more or less 

 quiline as in P. fascigera. 



Gnathopod 2: Second joint not much expanded, but the lower front 

 corner is produced into a narrow downward-pointing lobe which is 

 very characteristic of this species, as it is present also in the second 

 gnathopod of the female (figs. 3,^ and 4,r) ; tlie front margin of the 

 joint bears a few minute spinules and the hind margin bears several 



