104 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



as long as the telson. The inner blade is narrower and unevenly 

 rounded on its distal margin and has a median longitudinal groove, 

 and is narrower than the outer blade which is less unevenly convex, 

 distally, and has an oblique groove which runs to the angle of the 

 outer lateral margin ; this outer margin is also thickened. 



The eye is large, reniform; the dorsal surface flattish with a cal- 

 careous plate covering the greater part of the surface ; the lower part 

 of the cornea is very convex, black, resting within the cup-like basal 

 article of the antennae. 



The antennulae have the basal article long, hollowed beneath the 

 cornea; the second and third articles extremely short; the flagellum 

 biramose, short. 



The antennae have a very short basal article, a scaphocerite which 

 extends slightly beyond the tip of the antennular peduncle, and is 

 elongate-oval with the outer margin thickened, terminating subdistally 

 in a forward-pointing spine; the distal margin is slopingly rounded 

 from the subdistal tooth to the inner edge. The second and third 

 peduncular articles are extremely short; the flagellum is slender 

 but nearly as long as the entire body. 



The first, second and third legs are chelate, successively increasing 

 in length in the order named; the fourth and fifth legs are mono- 

 dactyl, successively longer than the third pair. All five pairs have 

 each an epipodite. 



The female thelycum lies between the bases of the fourth and fifth 

 pairs of legs and consists essentially of two large plates, lying side by 

 side between the bases of the fifth legs and together forming a shield- 

 shaped plate, the inner edge of each half slightly upturned, carina- 

 like. There is a smaller process placed medially between the bases 

 of the fourth legs. 



The male petasma is figured. (See text figure 1 B and IC.) 

 Synonymy. — Peneus brasiliensis Latkeille, Nouv. Diet. Hist. Nat., 

 vol. 25, p. 156, 1817. — H. Milne Edwards, Hist. Nat. Crust., vol. 

 2, p. 414, 1877. — Stimpson, Ann. Lye. Nat. Hist. New York, vol. 

 10, p. 132, 1871. — Smith, Trans. Conn. Acad. Arts and Sci., 

 vol. 2, p. 27, 1872. — ^Von Martens, Archiv. fur Naturg., ser. 2, 

 vol. XXXVIII, p. 140, 1872.— CouES, Proc. Acad. Nat. Sci. 

 Phila., vol. 30, p. 124, 1871.— Kingsley, ibid, p. 330.— Miers, 

 Proc. Zool. Soc. London, pp. 299-306, 1878.— Kingsley, Bull. 

 Essex Inst., vol. XIV, p. 106 (2), 1883.— R. Rathbun, Fishes 

 and Fish Industries U. S., Sect. I, text p. 822, 1844.— S. I. 



