22 



STALK-EiTED CRUSTACEA. 



Family TRAPEZIIDiE. 



TRAPEZIA Late. 



Pam. Nat., p. 269, 1825 [Trapezie] ; Encycl. Mctli., Hist. Nat., X. 695, 1825 [Trapezia]. 



Trapezia cymodoce (Hekbst) ? 



r 



? Cancer cymodoce TIerbst, Naturgesclii elite der Krabben und Krebse, III., Heft 2, p. 22, Plate LI. T^ig. 5, 



1801 (cf. GERSTyECKEU, Arcli, Naturgesch. XXIL, 1, pp. 125, 126, 1856). 

 ^Trapezia cymodoce Latu,, Encycl. Mctb,, Hist. Nat., X, 695, 1825. 



One female from Acapulco, Mex., AprillS. It agrees with specimens 

 from Panama doubtfully referred to T. cymodoce 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 Gerstaocker^ they lie far behind 

 the middle. Otherwise the specimen agrees pretty closely with Gerst^cker's 

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

 coerulea EUppell; and T. miniata Jacquinot. There are specimens bclongin 

 to the same species in the Museum of Comparative Zoology collected by 

 A. Agassiz at Acapulco in 1860, and at the Isles of Pcarls; 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 T. cymodoce by Dana. It agrees well with the Acapulco and Panama 

 specimens. 



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

 species with the hand subcristate above, and hairy on the outer surface, 

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

 latter writer has showai that Herbst's /^tw^c is very incorrect. 





Family PORTUNID^. 



AREN-ffiUS Baj^a. 



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



Arenseus mexicanus (Gerst.). 



Euctenoia mexkana Gerst., Arch. Naturgesch., XXIL, 1, p. 131, Plate V, Pigs, 3, 4, 1856. 



Arenmus bidcm Smith, Ann. Ecp., Peabody Acad. Sci. for 1869 and 1870, p. 90, 1871. 



Neptunus mexicanus A. M. Edw., Crustaces de la Region Mex., p. 212, Plate XLII. Pig. 3, 1879. 



Three males/Cocos Island, Feb. 28. Previously known from the west 

 coast of Mexico and Nicaragua. 



* Proc. Boston Soc. Nat. Hist., XIL 987, 1869. 



t Ann. Mag. Nat. Hist., 5th Series, II. 409, 1878, Rep. Cliallengcr Prachyura, p. 165, 1886. 



