Boone, Crustacea, Cruises of "Eagle" and " Ara," 1921-28 83 



The peduncle of the uropod is small, strong, the dorsal surface granu- 

 losa, a median triangular point distally; the blades are large, four- 

 fifths as wide as long, with the outer lateral margin broadly rounded, 

 the distal margin nearly truncate and the inner lateral margin nearly 

 straight. The proximal part of each blade is thickened and very 

 granulosa ; the remaining part is covered by numerous fine, radiating 

 riblets set with fine, stiff setae. 



The external maxillipeds are relatively small but fill the buccal 

 cavity ; the ischium is as long as that of the endognath, slender, rod- 

 like on the inner side, with a convex-margined, leaf-like expansion on 

 the outer side, which fits beneath the margin of the buccal cavity; 

 the whip is slender, setiferous on its outer margin, fitting under the 

 tooth-like projection of the anterior angle of the buccal cavern. The 

 ischium of the endognath is nearly as wide as long, with the outer 

 distal angle slightly accentuated ; the merus is not much smaller than 

 the ischium but narrow distally ; there is a longitudinal sulcus on both 

 articles near the outer margin; the proximal part of the ischium is 

 much more roughly granulose than the balance of the outer surface 

 of the maxilliped. The triarticulate palp is stocky, the second joint 

 being the longest of the series, the three joints folding inside the proxi- 

 mal articles and being nearly as long as they. 



The sternal plastron bears an arched ridge, terminating at each end 

 in a ventrally directed tubercle between each pair of legs. 



The seven pairs of legs are each monodactyl. 



Synonymy. — Scyllarus aequinoctalis Lund, Skrivter af Naturhistorie- 

 Selskabet, Copenhagen, II (2), p. 21, 1793.— Fabricius, Suppl. 

 Entom. Syst., p. 399, 1798.— Bosc, Crustacea, vol. 2, p. 19, 1802. 

 — H, Milne Edwards, Hist. Nat. Crust., vol. 2, p. 285, pi. 24, fig. 

 6, 1837.— GiBBES, Proc. Acad. Nat. Sci. Phila., 1850, p. 193.— 

 S. I. Smith, Trans. Conn. Acad. Sci., vol. 2, p. 18, p. 39, 1869 

 (detailed description). — Rankin, Ann. N. Y. Acad. Sci., vol. 12, 

 p. 535, 1869. 



Scyllarides aequinoctalis Gill, Science, new series, vol. 7, p. 99, 1898. 

 — Rathbun, Bull. U. S. Fish. Comm., vol. 20, pt. 2, p. 97, 1901.— 

 A. E. Verrill, Trans. Conn. Acad. Arts and Sci., vol. 12, p. 535,. 

 1869. — Boone, Bull. Bingham Oceanog. Coll., vol. 1, part 2, p. 

 88, 1927. 



