THE BRACHYURA AND MACRURA OF PORTO RICO. 
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carapace, unarmed below, basal portion armed above with a thin and high carina which extends back 
upon the carapace for a short distance, forward as far as the eyes, and armed with five sharp and 
prominent teeth and at its posterior extremity with another tooth separated by a considerable space 
Antennje long and slender; peduncle with only a very small lamelliform appendage on the inside, which 
is not foliaeeous; flagella very long and slender. Fourth and fifth pairs of thoracic legs very long, the 
terminal segments very slender and flagelliform. 
Length, about 5 inches. 
Mayaguez and Arroyo, Porto Rico; plentiful. Caravellas, Province of Bahia, Brazil (Smith); 
Rio de Janeiro (Heller); Abrolhos (Kingsley); Maeeio, State of Alagoas, Brazil ( B ramie r- Agassiz 
Exped., 1899). 
Genus SICYONIA Milne Edwards. 
fUcyonia Milne Edwards, Ann. Sei. Nat., xix, 344, 1830. 
Integument rigid. Carapace surmounted by a median dentate crest. Abdomen carinated above 
and having several furrows which give it the appearance of being sculptured. Trunk-legs without 
exopods. Pleopods all single branched. 
Key to the Porto Rican species of the genus Sicyonia. 
A. Dorsal crest with three teeth on carapace and two on rostrum Uevigata 
A'. Dorsal crest with two teeth on carapace and three on rostrum dorsalis 
Sicyonia laevigata Stimpson. 
Aicyoniu Ueeigata Stimpson, Ann. Lye. Nat. Hist. N. Y., X, 131, 1871. 
Carapace with three dorsal equidistant teeth. Rostrum long, reaching nearly to end of antennular 
peduncle; upper margin concave, with two teeth above; extremity upturned, truncate, with two or 
three spiniform teeth. Antennular peduncle long. External maxillipeds considerably longer than 
antennal peduncle. Third pair of feet exceeding the external maxillipeds by length of fingers and 
half the palm. Abdomen with sharp median carina; sides almost smooth, with shallow sulci. 
Length of female from tip of rostrum to tip of telson, 40 mm.; length of carapace and rostrum, 
16.2 mm.; length of rostrum, 6.8 mm. 
The Porto Rican specimens are all smaller than the specimen measured. A few of them have 
six dorsal teeth instead of five, either four on the carapace proper or three on the rostrum. 
Charleston, S. C. (Stimpson); Marco, Fla., 1 to 8 fathoms (II. Hemphill, coll.); Pulita Rassa, 
1 fathom (FI. Hemphill, coll.); Charlotte Harbor (W. H. Dali, coll.); Sarasota Bay (II. Hemphill, 
coll.; also recorded by Kingsley); off St. Martin’s Reef, 17 feet (J. F. Moser, coll.); St. Thomas 
(Albatross); Sabanilla, United- States of Colombia (Albatross). Porto, Rico: Mayaguez, on coral reef; 
Mayaguez Harbor; off Vieques, 6 to 16 fathoms, stations 6085, 6092, and 6096; off Culebra, 15 and 
15)- fathoms, stations 6087 and 6093; off Humaeao, 9) and 12) fathoms, stations 6098 and 6099. 
Sicyonia dorsalis Kingsley. 
Sicyonia dorsalis Kingsley, Proc. Acad. Nat. Se.i. Phila:, xxx, 1878, 97 (9). 
Carapace with a tooth a little behind the middle and another near rostrum. Rostrum short, 
reaching slightly beyond eyes, extremity depressed; upper margin arcuate or convex, armed with 
three teeth above and one below near tip. Antennular peduncle short, the third joint half as long as 
second. External maxillipeds shorter than peduncle of antenna 1 . Third pair of feet reaching slightly 
beyond external maxillipeds. Abdomen deeply carinated and punctate, lateral margins of segments 
truncate, anteriorly angular, or with a small tooth, the third, fourth and fifth segments in the full- 
grown individual with a postero-lateral spine. 
Dimensions of female: Length from tip of rostrum to tip of telson, 90 mm. ; length of carapace and 
rostrum, 21.5 mm.; length of rostrum, 4.8 mm. 
Porto Rican specimens are much smaller than the above. 
Pensacola, Fla. (S. Stearns, coll.) ; Gulf of Mexico, 30 to 88 fathoms, stations 2403 to 2405 (Albatross); 
Fort Jefferson, Fla. (type locality); off Key West, 45 fathoms, station 2318 (Albatross); off Carysfort, 
60 fathoms, station 2641 (Albatross ) ; Straits of Florida, 56 fathoms, station 2639 (Albatross) ; off Habana, 
230 fathoms, station 2321 (Albatross); Sabanilla, United States of Colombia (Albatross); Bermudas, 
(Verrill). Porto Rico: Mayaguez Harbor, 12 to 18 fathoms, station 6061; off St. Thomas, 20 to 23 
fathoms, station 6079; off Vieques, 6 to lti fathoms, stations 6091, 6092, and 6096. 
