392 BULLETIN OF THE BUREAU OP FISHERIES. 



Genus HIPPOLYSMATA Stimpson. 



Hippolysmata Stimpson, i860, p. 36 [95]. 



Hippolysmata wuidemanni (Gibbes). PI. xxvi, fig. 12. 



Hippotytt wurdemanni Gibbes, 1850, p. 197. 



Hippolysmata ■wurdemanni Kingsley, 1878a, p. 90: ibid, i8Soa, p. 41X. 



Carapace dorsally carinate on anterior half and w-ith a spine about midway between tip of rostrum 

 and posterior margin. Rostrum reaching distal end of second article of peduncle of antennule, slightly 

 decxu-ved, armed above with four teeth and below with three or fotir teeth. Anterior margin with a 

 strong spine behind base of antenna. Antennules with the inner flagellum slender, about as long as 

 body; outer flagellum with about 20 basal segments thickened and bearing at about the seventeenth 

 segment a long slender flagellum similar to the inner one. Antennal scale long, narrow, truncate at 

 tip and with a strong apical spine; flagellum considerably longer than body. First pair of legs with 

 carpus and hand of nearly equal lengtli, fingers half as long as palm. Carpus of second pair about forty- 

 seven articulate, sharply bent at about the nineteenth articulation. 



Abdomen smootli, not strongly geniculate. Telson narrow, straight sided, upper siu'face with 

 four small, movable spines forming a square near middle; tip truncate, with two slender spines. 



Length of a female, 30 mm.; carapace and rostrum, 11 mm.; rostrum, 3 mm. 



Color, a translucent white with beautiful longitudinal and transverse markings of red. 



Commonly found at Beaufort swimming near the stone jetties or among hydroids growing on piles. 



Family PALAEMONIDAE. 



Caridea having the first two pairs of legs chelate, the second pair usually larger 

 than the first, the carpus of the second pair of legs not subdived, the rostrum long, 

 compressed, armed with teeth and not movable, the mandibles deeply cleft and the 

 second maxillipeds with a very short seventh article. 



Twenty-six genera are now recognized of which four are represented in the Beaufort 

 fauna. 



KEY TO THE GENERA OF THE BEAUFORT REGION. 



a. Legs of the second pair approximately alike in size and shape 

 b. Rostrum with teeth both above and below. 



c. Mandibles with a palp PaUemon. 



cc. Mandibles without a palp Palcsmonetes. 



bb. Lower siu^^ace of rostrum toothless except at tip Urocaris. 



aa. Legs of second pair dissimilar, one of them greatly enlarged Coralliocaris. 



Genus PAL^MON Fabricus. 

 PaltBmon Fabricus, 1798, p. 387; Leander Desmarest, 1849, p. 87: Stimpson, i860, p. 40 [109]. 

 Palasmon tenuicomis Say. PI. xxvn, fig. 6. 



Palcemon tenuicornis Say. 181S, p. 349; Sumner, 1911, p. 663. 

 Pa2<sitton lenuiroslris H. Milne-Edwards, 1S34-1840, t. n, p. 395. 



Form stout, integument firm, translucent. Cephalothorax short. Carapace almost as deep as 

 long, its front margin wth a spine just below the eye and another a little back at the base of the antenna. 

 Rostrum with its axis dectu-ved but upper margin of crest almost straight, armed above with 11 or 12 

 teeth and below with 6 or 7, the teeth more and more crowded distally and the spaces between them 

 densely ciliated. 



Pedimcle of antennules shorter than rostrum ; outer flagellum very slender and much shorter than the 

 inner one which has its basal portions thickened and bears a long, slender side branch near its base. 

 Antennal scale reaching to tip of rostrum, tapering very slightly to a truncate tip, apical spine small; 

 flagellum very slender, about as long as body. First pair of legs weak, carpus shorter than hand, palm 

 shorter than fingers. 



