630 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
little practical importance in recognizing the species. In the Clip- 
perton series of C. erplorator, 8 eye scales lack teeth entirely, 350 
bear one tooth, and only 8 have two distinct teeth. In C. californi- 
ensis, none of the scales are unarmed, 121 have one tooth, 50 have 
two, and 2 have three. 
DistripuTion: Recorded previously only from the Gulf of California 
and Acapulco, Mexico. 
Family Hippidae 
Hippa pacifica (Dana) 
Remipes pacificus Dana, 1852, p. 407; 1855, pl. 25, fig. 7—De Man, 1896, p. 476; 
1898, pl. 33, fig. 53. 
Materia: East side, coral reef; August 9, 1958; Sta. W58-283; 
Reese, Baldwin, and Wintersteen; 3 males, 1 juvenile——EKast end, 
coral reef; August 15, 1958; Sta. W58-289; Reese, Baldwin, and 
Wintersteen; 2 juveniles.—North side, sand beach; August 15, 1958; 
E. S. Reese; 8 males, 14 females (10 ovigerous).—South shore, coral 
reef; August 19, 1958; Sta. W58-295; Reese, Baldwin, and Limbaugh; 
1 male, 1 female.—Northeast side, sand near dead shark awash at 
high tide; September 11, 1958; C. Limbaugh; 24 males, 54 females 
(42 ovigerous). 
MeEasuREMENTS: Carapace length in midline: males, 5.5-14.2 mm.; 
females without eggs, 7.7-18.7 mm.; ovigerous females, 10.8-18.2 mm. 
Remarks: Although the front is usually evenly concave between 
the submedian lobes, 29 of the 108 specimens from Clipperton Island 
have a suggestion of a median lobe, and in a few of them it is quite 
distinct. The number of tufts of setae above each lateral margin 
of the carapace varies as follows (the number in parentheses indi- 
cating the number of examples): 29(1), 30(1), 31(7), 32(9), 33(40), 
34(40), 35(42), 36(33), 37(23), 38(10), 39(8). 
DistTRiBuTION: East Indies to Gulf of California. 
Distribution of Non-Brachyuran Decapods 
As shown in figure 7, 14 of the 24 non-brachyuran decapods now 
known from Clipperton Island have been recorded from some part of 
the Indo-Pacific region to the west. Of those 14, only 6 have been 
reported from the other islands in the extreme eastern Pacific or 
from the American mainland. According to present knowledge, there- 
fore, Clipperton represents the easternmost limit, in the Pacific, of 
no less than 8 species. The remaining 10 of the 24 species seem 
to be restricted to the eastern Pacific; 7 of them have been found 
on the American mainland. None of the 24 Clipperton species are 
