22 STALK-EYED CRUSTACEA. 



Family TRAPEZIID^. 



TRAPEZIA Latr. 

 Fam. Nat., p. 269, 1S25 [Traj)e:ie]; Eucycl. Metli., Hist. Nat., X 095, 1S25 [Trapezia]. 



Trapezia cymodoce (Hkebst) ? 



? Cancer cymodoce Herbst, Naturgescliiclite der Kiabbeu und Krebse, III., Heft 2, p. 22, Plate LI. Fig. 5, 



1801 (cf. GERST.ECKER, Arcb. Natui-gcscb. XXII., 1, pp. 125, 126, 1856). 

 ? Trapezia cymodoce Latr., Encycl. Metb., Hist. Nat., X. 695, 1825. 



One female from Acapulco, Me.x., April 18. It agrees with specimens 

 from Panama doubtfully referred to 1\ cijmodoce by Smith.* The epibranchial 

 lateral spines are in a transverse line with the middle of the carapace, while 

 in Herbst's type of T. cymodoce, according to Gerstaecker, they lie far behind 

 the middle. Otherwise the specimen agrees pretty closely with Gerstoecker's 

 description of Herbst's type. It is the same as, or closely related to, Trapezia 

 coerulea Rlippell, and T. miniata Jacquinot. There are specimens belonging 

 to the same species in the Museum of Comparative Zoology 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 E.vploring Expedition at the Sandwich Islands, and referred 

 to 2\ cymodoce by Dana. It agrees well with the AcajDulco and Panama 

 specimens. 



Miers,t influenced by Herbst's figure, assigns T. cymodoce to the group of 

 species with the hand subcristate above, and hairy on the outer surfoce, — 

 a conclusion contradicted by Herbst's and Gerstsecker's descriptions. The 

 latter writer has shown that Herbst's _/^?(re is very incorrect. 



Family PORTUNIDJE. 



AREN^US Dana. 

 Amer. Journ. Sci. and Arts, 2d Scr., XII. 130, 1851. 



Arenseus mexicanus (Gerst.). 



Euctemta m'xicam Gerst., ,\rch. Naturgfscb., XXII., 1, p. 131, Plate V. Figs. 3, 4, 1856. 



Jrenieus bidem Smith, Ann. Rep., Peabody Acad. Sci. for 1869 and 1870, p. 90, 1871- 



Veptunm mexicanus A. M. Edw., Crustaccs de la Ilegion 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 Soc. Nat. Hist., XII. 287, 1869. 



t Ann. Mag. Nat. Hist., 5lb Scries, II. 400, 1878, Rep. Cballenger Bracliyura, p. 165, 1886. 



