CALIFORNIA STALK-EYED CRUSTACEA. 215 



armed with a small spine. Antennae about two-thirds the length of the 

 body; acicle narrow, reaching slightly beyond the tip of the anteunular 

 peduncle. Exognath of the external maxillipeds slender, not reaching the 

 tip of the merus. First chelipeds short, rather stout; second pair twice 

 the length of the first, the carpus much longer than the hand. Posterior 

 pereopods elongated, dactyls curved, spinulous below. 

 Length, 32-39 mm. 



From streams near Pasadena, Calif., where it is said 

 to be common. This species bears some resemblance to 

 the form from near the same locality which is here 

 described as Syncaris Treivi. It differs from the latter 

 in having fewer teeth on the lower side of the rostrum, 

 and, according to Kingsley's fig. 1, in the absence of a 

 supraorbital spine. Kingsley's fig. 6, which represents 

 a mandible with a two-jointed palp, probably refers to 

 the mandible of Naushonia and not, as is stated in the 

 explanation of the figures, to that of Caridina. 



Family PAL^EMONID^E. 



Body compressed. Carapace dorsally rounded and furnished with a 

 long, laterally compressed rostrum which is generally armed with teeth. 

 Ocular peduncles well developed. Antennules with the first joint hollowed 

 on the upper surface and furnished with a well developed basal spine; 

 flagella two, one of which is frequently branched. Antennae long, with a 

 long acicle, the outer margin of which terminates in a tooth or spine. 

 Mandibles with a molar tubercle and a cutting edge, with or without a 

 palp. Third maxillipeds pediform. First two pairs of pereopods chelate; 

 the carpus of the second pair not annulated. 



Genus Palaemon Fabr. 



Rostrum long, deep, dentate above and below. Frontal margin of the 

 carapace armed with two teeth, the one above the other. No hepatic spine. 

 Ocular pediincles pyriform and provided with an ocellus. Antennules 

 with two long flagella, the outer one branched. Mandibles with a three- 

 jointed palp. External maxillipeds slender, with a short exognath. First 

 pair of chelipeds slender; second pair larger than the first; the carpus 

 elongated. 



