

B 



Figure 36. — Periclimenes (Harpilius) umericanus (Kings- 

 ley ) . A, anterior part of body in lateral view, X 8.5 ; 

 B, antennule, X 11 ; C, antennal scale, X 11 ; D, first 

 leg, X 11 ; E, F, second leg (different specimens), X 7.5 

 (after Holthuis, 1951a). 



margin of basal antennular article convex, ending 



in well-developed anterolateral tooth; second and 

 third articles elongate, second slightly shorter 

 than third; upper antennular flagellum with 2 

 rami fused for 8-12 joints (often 6 in younger 

 specimens), free portion of shorter ramus with 3 

 or 4 joints, length less than one-fourth that of 

 fused part. Antennal scale slightly exceeding 



antennular peduncle, outer margin straight or 

 slightly concave and ending in a strong tooth J 

 slightly exceeding distally narrowed lamella; I 

 scale with a distinct spine near base; antennal I 

 peduncle not reaching to middle of scale. All I 

 maxillipeds with well-developed exopods. 



First legs slender; chela and sometimes a small I 

 portion of carpus extending beyond antennal I 

 scale; fingers smooth, as long as palm. Second I 

 legs equal in size and shape, very strong and I 

 longer than first; adult males with fingers less I 

 than half as long as palm, three or four teeth on I 

 cutting edges leaving gape at midlength when I 

 closed; second legs shorter and fingers not agape | 

 in juveniles and adult females. 



Abdomen with pleura of first four segments 

 rounded, of fifth ending in a small tooth ; median 

 posterior margin of third only slightly produced 

 posteriorly. Sixth segment about 1.5 times as 

 long as fifth and about three-fourths length of 

 telson. Telson with two dorsal pairs of spines at 

 one-third and two-thirds length ; posterior margin 

 with three pairs of spines, intermediate pair less 

 than twice length of inner spines. 



Measurements. — Length of body : male 22 mm. ; 

 ovigerous females, 13 to 20 mm. 



Variations. — The carpus of the second pair of 

 legs varies in length as do the dactyls of the last 

 three pairs of legs. 



Color. — Ground color translucent grayish 

 white; carapace with three oblique orange-brown 

 lateral lines and a pair of dorsal lines running 

 back from base of rostrum; each abdominal seg- 

 ment crossed by a narrow brown band and a row 

 of small dark spots on posterior margin ; tail fan 

 with two larger lateral and median spots and an 

 orange-brown tip (Verrill, 1922). " 



Habitat. — This species lives in coastal waters, 

 preferring sandy or rocky bottom, often between 

 algae or coral. Verrill (1922) found large schools 

 near the surface in Bermuda, and Gurney (1943a) 

 found it to swim singly or in small numbers at 

 the surface at night in certain periods of the 

 lunar cycle (see Holthuis, 1951a). Shallow water 

 to 40 fathoms. 



Type locality. — Key AVest, Fla. 



Known range.- — Beaufort, N.C.; Jupiter Inlet, 

 Fla., to west coast of Florida off Hernando 

 County; off Cape Catoche, Yucatan, Mexico; 

 through West Indies to Aruba; Bermuda. 



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