1192 



CRUSTACEA. 



very large and stout, with the finger not over half the length of the 

 hand; setae of finger as long as the finger. Anterior antennas of 

 female have the last five joints minute, and the setae at apex shorter 

 than these five joints together; second joint from base longer than 

 third. Abdominal segments, excepting the sixth, equal. The second 

 pair of legs has the apical joint of the longer branch longest at apex, 

 the shorter branch is little longer than the basal joint of the longer 

 branch, and has the apical joint short ; both branches terminate in 

 two minute claws. The caudal stylets are scarcely longer than broad, 

 and the setae are nearly as in H. concinnus. In coition, the female is 

 grasped around the cephalothorax by the cheliform antennae of the 

 male. Many were observed thus in connexion. 



Harpacticus sacer, Dana, Proc. Amer. Acad. Sci., i. 152, 1847. 



HAEPACTICUS ? ACUTIFRONS. 



Maris : — Ceplialothorax angustd ellipticus, antich acutus, postice ohtusus. 

 Abdomen subito angustivs, 6-articulatum, posticd vdlde attenuatum, seg- 

 mento ultimo angustissimo. Antennae anticce breves, 5-articulatce ; 3 

 articulis basalibus non oblong-is, tertio minimo, quarto crassissinno et 

 cylindrico, fere dimidii antennae longitudine, quinto (forsan duplice), 

 digitiformi, parvulo; antennis juxta basin et ad apicem breviter setv- 

 geris. Styli caudales minuti, non divaricati; setis strict^ appressis, 

 seta majore dimidio corporis parum longiore, nudd. 



Male ; — Cephalothorax narrow elliptic, acute in front, obtuse at the 

 posterior angles. Abdomen abruptly narrower than cephalothorax, 

 six-jointed, much attenuate posteriorly, last segment very narrow. 

 Anterior antennae short, five-jointed, three basal joints not oblong, 

 the third smallest, the fourth very stout cylindrical, as long as the 

 three preceding together, the fifth (perhaps a double one) digitiform, 

 small ; the antennae near base and at apex bearing short setae. Cau- 

 dal stylets minute, not divaricate, setae closely appressed together, 

 the longest a little longer than half the body, naked. 



Plate 83, fig. 11 a, male, enlarged; b, extremity of a maxilliped or 

 perhaps of the mandibular palpus. 



