550 CRUSTACEA. 



Length, nine lines. Scale or tooth at the outer side of base of inner 

 antennae very slightly longer than the first joint. Hands without 

 costae or any unevenness of surface. Legs of second pair about one- 

 third longer than third. The third joint of the third and fourth pairs 

 rather narrow, and all the joints with very few hairs. 



b. Orbitse margo spinula denteve armatus. 



Alpheus ACUTO-FEMORATUS. 



Rostrum acutum, postice in superficiem inter oculos productum. Squama 

 antennarum externarum basalis basibus antennarum non longior. 

 Dens basalis antennarum internarum brevis, articulus 2dus \mo parce 

 longior. Orbitce margo acutus sed spina nan productus. Pedes 2di 

 2>tiis sat longiores, carpi articulo \mo brevi, 2do plus duplo longiore 

 quam lmus. Pedes Stii 4:tique crassiusculi, articulo 2do 2>tioque 

 apicem inferiorem instar spince elongate acuto. 



Beak acute, surface between the eyes carinate. Basal scale of outer 

 antennae not longer than base of either pair of antennae. Basal 

 tooth of inner antennae short, second joint hardly longer than first. 

 Margin of orbit acute, but hardly produced into a spine. Feet of 

 second pair considerably longer than third ; first joint of carpus 

 short, second more than twice as long as first. Third and fourth 

 pairs of feet rather stout, second and third joints having the lower 

 apex produced into a rather long spine. 



Plate 35, fig. 2 a, front, much enlarged; b, part of outer maxilliped; 

 c, part of front of second pair; d, ibid, of third or fourth pairs; e, ibid, 

 of fifth pair. 



Balabac Straits. 



Length, nine lines. The hands of the specimen are gone, and we 

 are not sure that the species should not be in the preceding division, 

 although its general characters are more like those in which the lower 

 margin of the hand is straight. It is peculiar in having a spine at 

 the apex of both the second and third joints of the third and fourth 



