CALIFORNIA STALK-EYED CRUSTACEA. 181 



maxillipeds equalling or exceeding the tips of the antennal scale, the 

 terminal joint elongated and spinnlous at the tip. In the first chelipeds 

 the hand is narrow, a little longer than the carpus; fingers about two- 

 thirds as long as the palm. Second pair of pereopods very long and 

 slender; ischium stouter than the merus and about as long, and more or 

 less annulated towards the tip; merus divided into something over twenty 

 annulations; carpus about as long as the merus and ischium combined 

 and divided into about thirty-two annulations; hand minute, oblong, the 

 fingers scarcely as long as the palm. The three posterior pairs of pereo- 

 pods are subequal in length, much longer than the first pair, but shorter 

 than the second; merus joints stouter than the distal ones and armed with 

 scattered spinules; propodi elongated, minutely spinulous below; dactyls 

 ver}^ short and armed below with spines. Postero-lateral angle of the 

 fifth abdominal segment acute; that of the fourth segment rounded. Tel- 

 son subacute, much shorter than the uropods, and armed on the rounded 

 dorsal surface with two pairs of spinules. 



This beautiful species is very conspicuously marked with longitudinal /( 

 stripes of drab and red or reddish brown. 



Length from tip of rostrum to tip of telson, 47 mm.; length of carapace 

 from tip of rostrum, 17 mm.; length of acicle, 9.5 mm.; of first pair of 

 chelipeds, 15 mm.; of second pair, 25 mm.; of third pair, 22 mm.; of tel- 

 son, 7 mm. 



San Diego (Stimpson)! Santa Catalina Is. (Locking- 

 ton)! San Pedro! Found in tide pools. 



I have examined the type specimens of Lockington's 

 Hippolyte lineata. They unquestionably belong to the 

 above species. 



Family ALPHEID^. 



Kostrum small or absent. Eye-peduncles short and concealed beneath 

 a projection of the frontal margin of the carapace. Mandibles deeply 

 divided at the apex and furnished with a palp. First pair of pereopods 

 chelate and larger than the second pair which is slender, chelate and has 

 the carpus annulated. Telson broad and rounded. 



Genus Alpheus Fabr. 



Carapace compressed, rounded above. Rostrum short or absent. Eyes 

 completely hidden beneath the carapace. Antennules biflagellate. Man- 

 dibles stout, the apical process narrow, palp two- or three-jointed. 



