198 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



Abdomen : The first segment is short, mostly concealed ; the second 

 to fifth segments, inclusive, are subequal, each with the postlateral 

 angle acute ; the telson is about as long as the four preceding segments 

 considered together, and has the postlateral margin broadly rounded. 

 The uropoda have the peduncles small, the blades unequal, the outer 

 blade only two-thirds as long as the inner, suboval, widest distally and 

 also heavily ciliated. 



There are five pairs of pleopoda, lying one upon the other, each 

 biramose with a stout peduncle; the two blades are elongate-oval, 

 heavily ciliated distally. 



Synonymy. — Cirolana mayana Ives, Proc. Acad. Nat. Sci. Phila., 

 pp. 186-187, 1891, pi. 6, figs. 3-lo, 1891.— Richardson, Proc. U. 

 S. Nat. Mus., vol. 23, p. 512, 1901.— Moore, Bull. U. S. Fish. 

 Comm., vol. 20, part 2, p. 166, pi. 8, figs. 1-5, 1901. — Richardson, 

 Bull. 54, U. S. Nat. Mus., p. 87, figs. 66-69, 1905.— Boone, State 

 Univ. Iowa, Studies Nat. Hist., vol. 9, No. 5, 92, 1921. 



Family: AEGIDAE. 



Genus: rocinela Leach. 



Rocinela aries Schiodte and Meinert. 



Plate 75, fig. B. 



Type : Collected in Panama Bay and deposited in the Copenhagen 

 Museum. 



Distribution: Gulf of Lower California, Mazatlan, Mexico, and 

 Panama Bay. 



Material examined: One specimen parasitic on snapper, Jicaron 

 Island, Panama, Pacific Ocean, Jan. 27, 1928, by the ^^Ara." 



Technical description: Animal elongate-ovate, 17 mm. long; 7 

 mm. greatest width. 



Head: Triangular, scarcely at all inserted; three millimeters wide 

 proximally, one and one-half millimeters long, with the apex rounded 

 and produced over the basal antennal articles. The eyes are large, 

 elongated, laterodorsal, with the anterior ends narrower, converging 

 but not meeting, separated posteriorly by a distance equal to the 

 length of one eye and separated anteriorly by about the average width 

 of the eye. Inner antennae with first article short, concealed beneath 

 the head in a dorsal view ; second article twice the length of the first ; 

 third article one and one-half times as long as the second; flagellum 

 composed of five small articles. Outer antennae more robust, extend- 

 ing to the anterior margin of the first thoracic segment ; the first ar- 



