163 
d ? 
Length of second pair of legs, : . 167 millims. 389 millims. 
ee third pair of legs, . é 5 55 ee — é¢ 
eS ‘* manus of first pair, : : 60 es 10 ce 
ee ‘¢ carpus ce A : F 55 es 13 se 
se “* meros eS : 5 : 35 oe 16 ee 
Notwithstanding the great difference in the proportions of the 
joints of the second pair of limbs in the males and females, I think 
there is no doubt they belong to the same species, since they were 
taken on the same occasion, and in other respects resemble each other 
closely. 
In every point except those mentioned above, my specimens agree 
with Streets’ description and figure, yet they are from the western 
shore of the Gulf of California, while his specimens were from Coat- 
zoalios River, Isthmus of Tehuantepec, and the species has always 
been known as an Atlantic one. Yet the differences are so small as to 
be, in my opinion, only varietal, and a parallel case occurs in the 
genus Alpheus, where A. heterochelis and A. minus are common to both 
the Atlantic and Pacific shores. 
Pontonia margarita S. 2. Smith, Am. Naturalist, 1869, vol. III, 
p. 245, foot note. 
This species, originally described from individuals collected at Pan- 
ama, was taken in considerable numbers at Port Escendido, Mulege 
Bay and Gulf of California, by W. I. Fisher, in August, 1876, at which 
date the females were with spawn. 
The color after a month in spirits, was a light rose tint, with occa- 
sionally some dark markings upon the hands. 
The specimens agree in every respect with Smith’s description, and 
inhabited the same shell, viz., Margaritophora finbriata. 
Pontonia pinnee nov. sp. 
- Body slightly depressed; carapax smooth, rostrum elongate-trian- 
gular, deflected, the tip lying between the base of the antennule; 
antennal spine prominent. 
Peduncles of eyes short, broad ovate, cornea much narrower than 
the peduncle. j 
Peduncle of antennule exceeding the rostrum by the length of its 
distal joint, flagella not longer than the two last joints of the peduncle 
subequal, the outer stouter than the inner. 
Antennal scale broad, as long as antennular peduncle, antennal fla- 
gellum extending backwards to about the middle of the carapax. 
