Boone, Crustacea, Cruises of "Eagle" and " Ara," 1921-28 203 



acute. The telson is subcircular, with the proximal border thickened 

 and usually a shallow depression on each side near this border. The 

 peduncle of the uropoda is carinate and thickened on its outer margin ; 

 the two lateral margins divergent distally ; the distal margin sinuate. 

 The inner blade of the uropoda is slightly longer than the outer ; both 

 are long and narrow, the distal margin rounded, the outer lateral 

 margin slightly convex, the inner lateral margin correspondingly con- 

 cave, and subparallel throughout the greater part of its length to the 

 outer margin. 



Legs: All seven pairs of legs are decidedly prehensile and suc- 

 cessively increase slightly in length from the first to seventh pair. 

 Each dactyl is very acuminate and so strongly curved that its tip is 

 approximately in line with the base of the propodus. 



MouTHPARTS: The maxillipeds have a palp of two articles. The 

 palp is composed of three articles. (Fully figured in Dr. Richard- 

 son's Monograph.) 



Synonymy. — Anilocra laticauda H. Milne Edwards, Hist. Nat. Hist. 

 Crust., Ill, p. 259, 1840. — Schiodte and Meinert, Naturorisk 

 Tidskrift (3), vol. 13, p. 126, pi. 9, figs. 1-3, 1881-83.— Richard 

 son, American Naturalist, vol. 34, p. 221, 1900 ; Proc. U. S. Nat 

 Mus., vol. 23, p. 528, 1901 ; Bull. 54, U. S. Nat. Mus., p. 227, figs 

 230-231, 1905.— Moore, Rept. U. S. Fish. Comm., vol. 20, pt. 2, p 

 172, pi. 10, figs. 3-4, 1901.— Boone, Univ. Iowa Studies Nat. Hist, 

 first series, No. 45, p. 94, 1918 j Bull Bingham Oceanog. Coll., vol 

 1, art. 2, p. 139, 1927. 

 Anilocra mexicana de Saussure, Rev. Mag. Zool., p. 505, 1857. 

 Anilocra leachii (Kroyer), Schiodte, Nat. Tidsk. (3), vol. 13, p. 205, 

 pi. 11, fig. 2a-2g, 1866. 



Family: CYMOTHOIDAE. 



Genus : CYMOTHOA Fabricius. 



Cymothoa exigua Schiodte and Meinert. 



Plate 77, fig. A. 



Type: Taken at Panama and Charles Island, Galapagos, in the 

 mouth of Citharichthys sordida, a small translucent flounder, and de- 

 posited in the Copenhagen Museum. 



Distribution : Known only from the type and the ''Ara" specimen; 

 also taken in the Galapagos, host, an angel fish. 



Material exa mined : One specimen taken as parasite in the mouth 



