22 . STALK-EYED CRUSTACEA. 
Famity TRAPEZIIDZ. 
TRAPEZIA Latr. 
Fam. Nat., p. 269, 1825 [Zrapézie]; Encycl. Méth., Hist, Nat., X. 695, 1825 [Zrapezia]. 
Trapezia cymodoce (Herzsr) ? 
? Cancer cymodoce Hexrsst, Naturgeschichte der Krabben und Krebse, III., Heft 2, p. 22, Plate LI. Fig. 5, 
1801 (cf. GersracKer, Arch. Naturgesch. XXIL., 1, pp. 125, 126, 1856). 
? Trapezia cymodoce Latr., Encycl. Méth., Hist. Nat., X. 695, 1825. 
One female from Acapulco, Mex., April 18. It agrees with specimens 
from Panama doubtfully referred to 7. eymodoce by Smith.* The epibranchial 
lateral spines are in 4 transverse line with the middle of the carapace, while 
in Herbst’s type of 7. cymodoce, according to Gerstzcker, they lie far behind 
the middle. Otherwise the specimen agrees pretty closely with Gerstecker’s 
description of Herbst’s type. It is the same as, or closely related to, Zrapezia 
cerulea Riippell, and 7. miniata Jacquinot. There are specimens belonging 
to the same species in the Museum of Comparative Zoélogy collected by 
A. Agassiz at Acapulco in 1860, and at the Isles of Pearls, Panama Bay, in 
1875. _ There is also in this Museum one of the specimens collected by 
the Wilkes Exploring Expedition at the Sandwich Islands, and referred 
to 7. cymodoce by Dana. It agrees well with the Acapulco and Panama 
specimens. 
Miers,} influenced by Herbst’s figure, assigns 7. eymodoce to the group of 
species with the hand subcristate above, and hairy on the outer surface, — 
a conclusion contradicted by Herbst’s and Gerstecker’s descriptions. The 
latter writer has shown that Herbst’s figure is very incorrect. 
Famity PORTUNIDA. 
ARENASUS Dana. 
Amer. Journ. Sci. and Arts, 2d Ser., XII. 180, 1851. 
Arenzus mexicanus (GeErs7.). 
Euctenota mexicana GERst., Arch. Naturgesch., XXII., 1, p. 181, Plate V. Figs. 3, 4, 1856. 
Areneus bidens Sir, Aun. Rep., Peabody Acad. Sci. for 1869 and 1870, p. 90, 1871. 
Neptunus mexicanus A. M. Evw., Crustacés de la Région Mex., p. 212, Plate XLII. Fig. 3, 1879. 
Three males, Cocos Island, Feb. 28. Previously known from the west 
coast of Mexico and Nicaragua. 
* Proc, Boston Soe. Nat. Hist., XII. 287, 1869. 
+ Aun. Mag. Nat. Hist., 5th Series, 11. 409, 1878, Rep. Challenger Brachyura, p. 165, 1886. 
