sharp, forward pointing spinules on crests. Third 

 leg large; merns with two separated, upper, cren- 

 ulated margins, lower border tuberculate, poste- 

 rior surface with a deep, pubescent concavity, 

 smooth within; ischium at lower distal end ex- 

 tending well past base of merus and with meral 

 concavity continued on posterior face, lower bor- 

 der tuberculate; carpus and propodus together 

 equal in length to upper length of merus; dactyl 

 stout, nearly straight, without minute spinules. 

 Fourth leg similar to third but smaller, merus 

 with lower border tuberculate, dactyl slightly up- 

 turned at tip. 



Male abdomen with telson semioval, sides not 

 wider than concave sided sixth segment ; third, 

 fourth, and fifth segments partially fused. 



Measurements. — Carapace : male, length, 9 mm., 

 width, 21 mm.; female, length, 9 mm., width, 

 21 mm. 



Color. — In alcohol, a muddy bluish brown ; legs, 

 abdomen, and chelipeds ivory. 



Type locality. — Isle of Palms (about 15 miles 

 northeast of Charleston, S.C.), washed on beach, 

 under drift material. 



Remarks. — The above account is taken chiefly 

 from Glassell (1937). The types are the only 

 known specimens and the host and habitat are un- 

 known. 



Family Palicidae 



Carapace broadly transverse, subquadrilateral. 

 Anterolateral margins dentate. Frontoorbital 

 width great, front dentate. Orbits and eyes large. 

 Buccal cavity quadrate, outer maxillipeds not 

 covering it ; ischium of third maxillipeds strongly 

 produced forward on inner side; merus small, 

 subtriangular, with a notch on inner distal side 

 for articulation of palp. Afferent channels to 

 branchiae opening at bases of chelipeds; efferent 

 channels at anteroexternal angles of buccal cavity. 



Chelipeds of moderate size, often unequal in 

 male, usually tuberculate or granulate. Next three 

 pairs of legs long, slender, and rough; last pair 

 either very short and slender, subdorsal, smooth, 

 or similar in position and ornamentation to other 

 legs, and near size of first walking leg. Abdomen 

 of male much narrower than sternum (Eathbun, 

 1918b). 



Genus Palicus Phillipi, 1838 



Rathbun, 1918b, p. 183; Holthuis and Gottleib, 1958, p. 104. 



KEY TO SPECIES IN THE CAROLINAS 



a. Merus of second and third walking legs with an obtuse 

 lobe at superodistal angle ; frontal notch shallow, form- 

 ing nearly a right angle at base alternatus (p. 215). 



aa. Merus of second and third walking legs with a promi- 

 nent, sharp pointed lobe at superodistal angle ; frontal 

 notch deeper than wide faxoni (p. 216). 



Palicus alternatus Rathbun 



Figure 200 



Palicus alternatus Rathbun, 1897a, p. 95. 



Cymopolia alternata: Rathbun, 1918b. p. 188, text-fig. 117, 

 pis. 42-43 (rev.). 



Recognition characters.  — Carapace broader 

 than long, somewhat depressed, elevations covered 

 with small tubercles composed of single or a few 

 granules. Front broadly triangular, notched at 

 middle, with four lobes or teeth, outer teeth less 

 advanced than inner and broadly rounded. Eyes 

 large; orbits deep, with upper border cut into 

 teeth; middle tooth broad, obliquely truncate, 

 bounded on each side by a V-shaped fissure ; next 

 tooth separated from outer tooth by a shallow 

 sinus; outer tooth directed forward or a little 

 outward, tip curved inward. First two anterolat- 

 eral teeth dentiform with rounded tips, separated 



Figure 200. — Palicus alternatus Rathbun. Animal in 

 dorsal view, legs of left side not shown, 5 mm. 

 indicated. 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



215 



