Boone, Crustacea, Cruises of '^ Eagle" and "Ara," 1921-28 117 



close upon the sixth segment. The posterior margin of the fifth seg- 

 ment is incised similar to that of the fourth, and the epimeral region 

 is more broadly rounded, with a single, acute spine at the postlateral 

 angle. The sixth segment is nearly one and one-half times as long in 

 the median dorsal line as the fifth, and terminates posteriorly in an 

 acute laminate spine, which projects above the base of the telson; 

 there is a single, acute, small spine at the inferior postlateral angle. 

 The telson is one and one-half times as long as the sixth segment, and 

 is narrow, tapering, acuminate. The rhipidura has a short base and 

 two long blades, the outer of which is the larger with a short, sub- 

 distal tooth on the outer lateral margin; the distal margins of both 

 blades are convex. 



The eye is small, spherical. 



The antennulae have the basal article elongate and excavate be- 

 neath the eye and with two sharp spines on the outer lateral margin, 

 one behind the other and both in line with the antennal spine; the 

 second and third articles are short, cylindrical; the third being only 

 half as long as the second; the two branches of the flagellum are 

 short, subequal, either branch being about as long as the two preced- 

 ing peduncular joints. 



The antennae have a short basal article with an acute spine at its 

 outer distal angle, the second joint short, cylindrical; the third joint 

 elongate cylindrical, extending three-fourths of the length of the 

 scaphocerite. The flagellum is rather thick, about as long as the 

 scaphocerite. The scaphocerite extends rather farther forward than 

 the antennular peduncle and has the outer edge thickened, terminat- 

 ing subdistally in a very acuminate spine ; the distal margin is evenly 

 convex, ciliated. 



The first, second and third pairs of legs are subchelate ; the fourth 

 and fifth pairs monodactyl, with the dactyl rather long. 

 Synonymy. — Sicyonia penicillata Lockington, Bull. Essex Inst., vol. 

 10, p. 164, 1878 (1879), publ. Salem, Mass.— Schmitt, Proe. 

 Calif. Acad. Sci., ser. 4, vol. 13, p. 387, 1923. 

 Sicyonia affinis Faxon, Bull. Mus. Comp. Zool., vol. 24, p. 209, 1893 ; 

 Mem. Comp. Zool., vol. 18, p. 179, pi. 46, figs. 1-lc, 1895. 



Eusicyonia edwardsi (E. J. Miers). 



Plate 37. 



Type: Miers designated the name edwardsi for Milne Edwards' 

 species carinata, which came from Eio de Janeiro, Brazil, and was 

 deposited in the Paris Museum. 



