THE BRACHYURA AND MACRURA OF PORTO RICO. 
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Genus PERICLIMENES Costa. 
Periclimenes Costa, Ann. Ac. degl. Aspir. Nat. Nap., n, 1844; Faun. Reg. Nap., n, 1, 1846 (teste Borradaile); Borradaile, Ann. 
Mag. Nat. Hist. (7), ir, 380, 1898, and synonymy. 
Rostrum long, compressed, usually dentate, in side view diminishing gradually to a sharp point 
at free end, not bent downward; thicker flagellum of first antenna long or moderate, bifid; scale of 
second antenna long, usually narrow; second maxi lliped with penultimate joint as broad as — usually 
broader than — the last joint, which it bears terminally; third maxilliped narrow, the last two joints 
together may be longer or shorter than the preceding joint; dactyls of last three pairs of legs slender, 
nearly straight, without basal protuberance. (Borradaile.) 
Periclimenes americanus (Kingsley). 
Anchistia americana Kingsley, Proc. Acad. Nat. Sci. Phila., xxx, 1878, 96 (8); Bull. Essex Inst., xiv, 109, pi. it, f. 10, 1882. 
Periclimenes americanus Borradaile, Ann. Mag. Nat. Hist. (7), n, 383, 1898. 
Rostrum reaching nearly to end of antennal scale, upper margin straight, directed slightly 
upwards, seven to nine-toothed; two teeth on carapace proper; posterior one at anterior two-fifths of 
carapace, and farther from second than the remainder are from each other; two to three teeth on lower 
margin. Hepatic and antennal spines present. Basal joint of antennula; very broad, and as long 
as next two joints together, and with an antero-lateral spine; the thick upper and outer flagellum 
bifid for one-fourth its length; lower flagellum as long as peduncle. Basal joint of antennae with an 
outer distal spine; peduncle not reaching end of first antennular segment; scale slightly overreaching 
antennular peduncle; distal spine longish; flagellum as long as body. Last two joints of outer maxil- 
liped together are longer than preceding joint. 
First pair of feet very slender, elongate, end of carpus reaching tip of antennal scale; merus and 
carpus subequal in length; propodus two-thirds the carpus; fingers shorter than palm. Second pair of 
feet very elongate, as long as or longer than body; merus a little longer than carpus, which is more 
than half as long as palm and is distally enlarged. 
Palm cylindrical, slightly compressed; lingers about two-fifths as long as palm, slightly deflexed, 
armed with a few small teeth, when closed leaving hiatus. Third, fourth, and fifth pairs of feet long 
and slender, the fifth pair reaching end of rostrum. 
Dimensions of Culebran specimen: Length, 14.7 mm.; length of carapace and rostrum, 5.3 mm.; 
length of second foot, 15 mm. 
This species was found at the following Porto Rican localities: Mayaguez; Mayaguez Harbor; off 
Puerto Real, 8$ fathoms, station 6074; Ponce, on coral reef; off Humagao, 9£ fathoms, station 6099; 
off Vieques, 6 to 15 fathoms, stations 6085, 6091, 6096; Ensenada Honda, Culebra; off St. Thomas, 20 
to 23 fathoms, station 6079. 
Also occurs at Key West (type locality ) ; Florida (H. Hemphill, coll.) , at Orange Bluff, Clearwater 
Harbor, 1 to 2 fathoms; Sarasota Bay, Punta Rassa, 1 fathom; Marco, 1 to 3 fathoms, and Key West. 
Gulf of Mexico, 26 and 33 J fathoms, stations 2406 (Albatross) and 5072 ( Grampus ) ; off Cape Catoche, 
Yucatan, 24 fathoms, station 2365 (Albatross)-, Old Providence (Albatross); Port Antonio, Jamaica 
(J. E. Duerden, coll.); St. Thomas, W. I. (Albatross); Bermudas. 
Genus PONTONIA Latreille. 
Pontonia Latreille, Cuvier’s RCgne Animal, 2d ed., v, 96, 1829. 
Body depressed; rostrum short, depressed, bent downward, not dentate, with or without a keel 
below at the free end; both flagella of first antenna short, the thicker of the two bifid; scale of the 
second antenna of moderate length, broad; flagellum of same not short; second maxilliped with penul- 
timate joint broader than the last joint and bearing it terminally; third maxilliped with last two 
joints narrow, together shorter than the preceding joint, which is broad; dactyls of the last three legs 
straight or little curved, without basal protuberance; one of the second pair of legs with very large 
chela. 
