THE 15KACH YURA AND MACRURA OF PORTO RICO. 
97 
Tribe LORICATA. 
Body either depressed or subcylindrical. Rostrum broad and short or absent. Antennules with 
two flagella. Outer antennae without a scale, first joint of peduncle fused with epistome. Trunk 
legs six-jointed through coalescence; none of them chelate except the last pair which is sometimes 
subchelate in the female. First abdominal segment devoid of appendages in both sexes. Posterior 
portion of telson and uropods flexible. Gills trichobranchiate. 
Family SCYLLARID 7 E White, 1847. 
Carapace depressed, orbits excavated in the dorsal surface. Second antenna; short, squamiform. 
Mandibles with a one-jointed palp. Trunk-legs simple, except the fifth pair in the female, which are 
minutely chelate. Branchiae well developed; epipodal plates on the first joint in the first four pairs of 
trunk-legs have podobranchise attached to them as distinct plumes. These limbs have arthrobraneh ije, 
and the last four segments of the trunk have pleuro branchiae. 
Key to the Porto Rican genera of the family Scyllaridse. 
A. Exognath of outer maxillipeds without a flagellum Scyllarus 
A'. Exognath of outer maxillipeds with a flagellum _ Scyllarides 
Genus SCYLLARTJS Fabricius. 
Scyllarus Fabricius, Sys. Ent., 413, 1775. 
Arclus Dana, Crust. U. S. Expl. Exped., i, 516, 1852. 
Rostrum very short and truncate; exognath of third maxillipeds without a flagellum; pairs of 
branchial 19 in number. 
Scyllarus americanus (Smith) . 
Arcius americanus Smith, Amer. Jour. Sci. (2), xlviii, 119, 1869. 
Scyllarus ( Arclus ) guudlachi von Martens, Arch. f. Nat., xxxvm, pt. 1, 123, pi. v, f. 13, 1872. 
Carapace with three blunt median prominences, two of which are on the gastric region and one 
on cardiac region. Anterior prominence composed of two tubercles side by side, half-way between 
margin of the front and the larger posterior gastric tooth. Cardiac tooth also bifid. First joint of 
inner antennae short and dorsally flattened. Posterior margin of abdominal segments with a very 
slight median emargination. A small species, usually not more than half an inch long. 
Off Vieques, 15 fathoms, station 6091. Previously taken at Egmont Key, Fla. (type locality) ; 
Cuba (von Martens); off Cape Lookout, N. C., 22 fathoms, station 2608 ( Albatross ); off Cape Fear, N. 
C., 15 fathoms, station 2622 (Albatross) ; Blackfish Bank, off Charleston, S. C., 12 fathoms (R. E. Earll, 
coll.); off Key West, Fla., 45 fathoms, station 2318 ( Albatross ); Key Vaccas, Fla., among rocks, between 
tides ( H. Hemphill, coll. ) ; Marco, Fla., 2 fathoms (II. Hemphill, coll. ) ; off northwest end St. Martin’s 
Reef, Florida Banks (J. F. Moser, coll.) ; Gulf of Mexico, 21 to 33 fathoms, stations 2369 to 2374, 2407 
(Albatross), and stations 5052, 5078, 5085, 5102 (Grampus); St. Thomas, W. I., dredged (Albatross) ; off 
Cape St. Roque, Brazil, 20 fathoms, station 2758 (Albatross). 
Genus SCYLLARIDES Gill. 
Scyllarus Dana, Crust. U. S. Expl. Exped., I, 516, 1852. (Not Scyllarus Fabricius, 1775.) 
Scyllarides Gill, Science, n s., vn, 98, 1898. 
The rostrum very prominent; exognath of the third maxillipeds ending in a flagellum; pairs of 
branchial 21. 
Scyllarides aequinoctialis (Lund). 
Scyllarus xquinoctialis Lund, Skrivter af Naturhistorie-Selskabet, ix, 2, p. 21, Copenhagen, 1793. 
Scyllarides aequinoctialis Gill, Science, n. s., vn, 99, 1898. 
Carapace very convex from side to side, deflexed in the anterior portion. Lateral margins nearly 
parallel, with a slight indentation about one-fourth the distance from antero-lateral angle. Distance 
from lateral margin of carrpace to inner margin of orbit about two-fifths the distance between orbits. 
Dorsal surface covered with flat, scale-like tubercles closely crowded together and with short, stiff 
bristles. Rostrum with two conical contiguous teeth. Inner margin of outer antennae with erect, 
conical teeth or spines; second joint much broader than long; terminal joint suborbicular, margin 
erenate. First abdominal segment with two large reddish submedian spots, which unite anteriorly. 
2d— F. C. B. 1903—7 
