ZooL— Vol. III.] HOLMES— WEST AMERICAN CRUSTACEA. 315 



downward and thickly setose; fourth joint subtriangular, with a very prom- 

 inent, rounded, thickly setose posterior lobe; hand similar to that of the first 

 gnathopods but wider and having the palm somewhat less oblique. First 

 pereiopods with the first joint broad, the postero-distal angle broadly rounded; 

 second joint short; third and fourth joints rather wide, the third the longer; 

 fifth joint tapering, slightly curved, and a half longer than the fourth; dactyl 

 about half the length of the propodus. Second pereiopods similar to the 

 first, the first joint convex on both margins. Third pereiopods with the side 

 plate broad, quadrate, with a small posterior lobe whose lower margin is 

 about at right angles to posterior side of the anterior portion; first joint very 

 broadly ovate; third joint a half longer than the fourth; dactyl swollen at the 

 base. Fourth pereiopods much longer than the third, the first joint oblong, 

 convex anteriorly, the posterior margin convex above and concave below; 

 second joint longer than wide; third, fourth, and fifth joints narrow and 

 elongated; dactyl similar to that of the third pair; fifth pereiopods similar to 

 the fourth, the first joint narrower but otherwise similarly shaped. Pleopods 

 long, the rami nearly twice the length of the peduncles. First pair of 

 uropods with the peduncle longer than the rami, reaching further back than 

 the end of the sixth segment of the pleon, the upper margins armed with 

 spines; outer ramus a little shorter than the inner; both are armed with 

 spines on the upper side and a fascicle of spines at the tip. Peduncles of 

 the second pair of uropods spiny above and reaching a little further back 

 than the peduncles of the first pair; rami subequal to the peduncle in length, 

 the outer a little the shorter. Peduncle of the last pair stout, flattened above, 

 reaching a little beyond the middle of the rami of the preceding pair, the 

 supero-distal margin finely denticulated; rami short, subequal, about half 

 the length of the peduncle, outer ramus with 2 small, terminal spines; inner 

 ramus flattened, tapering. Telson short, obtusely pointed. 

 Length nearly i inch. 



This description is taken from Mr. Harford's type speci- 

 men of Dexamine scitiilus from Magdalena Bay, Lower 

 California. The eyes had lost their pigment and their 

 outline could not be clearly made out. The specimen still 

 retains traces of the beautiful purple color described by 

 Mr. Harford. 



Family OEDICERID^. 



Acanthostepheia behringanus (Lockmgton). 



Plate XXXVI, Figs. 25-28. 



CEdicerus behringiensis Lockington, Proc. Calif Acad. Sci. v. 7, p. 47, 1877. 

 Acanthostepheia pulchra Miers, Ann. and Mag. Nat. Hist. 5th ser. v. 7, 



p. 47, pi. VII, figs. I and 2, 1881. 

 Acanikosiepheia Malmgreni Stuxherg{not Goes),Evertebratfaunan i Sibiriens 



Ishaf. Vega-Expeditionens Vetenskapliga Jakttagelser, Bd. i, pp. 724, 



729, (wood cut). Delia Valle, Fauna and Flora des Golfes von Neapel, 



20 Monogr., Gammarini, p. 544, 1893 (in part). 



