588 CRUSTACEA. 



PAL^EMON NATATOR, Edwards. 

 Plate 38, fig. 11, mandible, enlarged. 

 Gulf-weed, Atlantic Ocean. September, 1838. 



Beak lanceolate, both margins arcuate ; teeth of upper margin of 

 beak ten to twelve in number. Below there are four teeth, but 

 they are often nearly or wholly concealed by the hairs of this margin, 

 so as to be detected with some difficulty. The body is nearly pellucid 

 along the medial line, and is brownish red or yellow either side, 

 giving the animal a peculiar appearance in the water. Length, three- 

 fourths of an inch. Maxillipeds lax hirsute. The two flagella of 

 inner antennae united only for a very short distance. 



EDWARDS, Crust., ii. 393; GOODSIR, Ann. Mag. Nat. Hist. 1845, xv. 74. 

 Leander erraticus, DESMAREST, Ann. Entomol. Soc. de France, 1849, p. 87 ; and 

 GUERIN'S Mag. de Zool. 



2. Carapax margine antico infra ocuhim spina und armatus, et pone hanc alterd 



minore. 



PAL^EMON GRANDIMANUS (RandalT) . 



Plate 38, fig. 12 a, cephalothorax, natural size; b, smaller hand of 

 second pair, natural size. 



Sandwich Islands. 



Rostrum lance-shaped, not reflexed or scarcely so, as long as scale 

 of antennae, teeth above running regularly to apex, fourteen or fifteen 

 in number, below four. Flagellum of outer antennae pubescent (pubes- 

 cence seen only when in a liquid). Outer maxillipeds short, reaching 

 but little beyond apex of base of outer antennae. Anterior legs very 

 slender, not half as long as next pair; second pair large, very unequal, 

 the longer very long, with the hand very stout, and two-thirds as 

 long as the body, nearly three times as long as carpus, scabrous, 



