216 CALIFORNIA ACADEMY OF SCIENCES. 



Palaemon Ritteri Holmes. 



Palcemon Ritteri HOLMES, Proc. Cal. Acad. Sci. (2), Vol. IV, 1895, p. 579, 

 PI. XXI, figs. 29-35. 



Carapace crested on the anterior third or half. A spine beneath the 

 angular suborbital projection of the anterior margin of the carapace and 

 another spine behind the base of the antenna and above the rounded in- 

 ferior angle. No hepatic spine. Rostrum a little longer than the carapace, 

 tapering gradually from the widest portion to the acute tip; upper margin 

 armed with seven or eight teeth, the posterior one of which is situated on 

 the gastric region; lower margin with three teeth. Antennal scale oblong, 

 shorter than the rostrum. First pair of chelipeds slender, not reaching 

 beyond the tip of the rostrum; carpus devoid of a spine; hand slender. 

 Second pair somewhat larger than the first; carpus not half as long as the 

 preceding joint; hand linear and slightly bent. 



Length, 4.5 cm. 



San Diego, Calif. (Dr. Ritter). 



Genus Anchista Dana. 



Rostrum long and slender. Eyes prominent. Antenuules with one 

 flagellum partly divided. Mandibles devoid of a palp. External maxilli- 

 peds slender. Second pair of pereopods long, slender and equal. Dactyls 

 slender, long, and nearly straight. 



Type. A. gracilis DANA. 



Anchista tenuipes, sp. nov. 



Rostrum about as long as the carapace, rather deep near the middle, 

 armed above with six or seven teeth, the last one or two on the carapace; 

 lower side armed with three or four teeth; the last dorsal spine is near the 

 anterior third of the carapace. A supraorbital, an antennal and a hepatic 

 spine present; antero-lateral angle of the carapace rounded and devoid of 

 spines. Ocular peduncles large and furnished withan ocellus between the 

 cornea and the proximal part of the stalk. Antennular peduncle shorter 

 than the autennal scale; first joint with a small spine at theantero-external 

 angle, the basal spine small, not reaching the middle of the joint; second 

 and third joints of subequal length; flagella longer than the peduncle, the 

 lower one very slender. Antennae about as long as the body; a spine on 

 the outer angle' of the second basal joint; acicle oblong, equalling or 

 exceeding the rostrum. Maxillipeds slender, not nearly reaching the tip 

 of the acicle; exognath reaching considerably beyond the antepenultimate 

 joint. Anterior pereopods very slender, and reaching scarcely beyond the 



