ZooL— Vol. III.] HOLMES— WEST AMERICAN CRUSTACEA. 319 



Described from three type specimens of Mr. Harford's 

 Allonisctis maciilosus (No. 2594) from Angel Island, Bay 

 of San Francisco. 



Family CIROLANID^F. 



Cirolana Harfordi (Lockington). 



Plate XXXVII, Figs. 32-38. 



^ga Harfordi Lockington, Proc. Calif. Acad. Sci. v. 7, p. 46, 1877. 

 Cirolana californica Hansen, Vidensk. Selsk. Skr. ser. 6, Natur. og math. 



Afd. 5, 1890, pp. 338, 339 (fide Richardson). 

 Cirolana Harfordi Richardson, Proc. U. S. Nat. Mus. v. 21, p. 822, 1899. 



Body nearly smooth. Sides of the thorax nearly parallel, the first seg- 

 ment marked longer than the subequal following ones, the antero -lateral 

 angles produced forward as a triangular, acute or subacute process which 

 commonly covers the lower part of the eye. Epimera oblong, the postero- 

 lateral angles of the first 3 segments rounded, those of the last 4 acute and 

 produced backwards. The epimeral suture on the first segment is much 

 less distinct than in the others and extends upwards and forwards to the 

 upper corner of the head. The lower margins of the epimera are bordered 

 by a broad raised line which is wider in front than behind and which becomes 

 successively wider in front in the posterior segments until it includes the 

 larger portion of the epimera. 



Abdomen short, the first segment concealed by the thorax, the 3 following 

 ones of equal length, and concave behind; fifth segment longer in the middle 

 and shorter at the sides than the preceding ones, the posterior margin nearly 

 straight (usually a little convex); postero-lateral angles of the first 2 segments 

 acute but commonly concealed by the epimeron of the last thoracic segment; 

 postero-lateral angle of the third segment subacute or narrowly rounded, 

 that of the fourth produced and rounded; lateral angle of the fifth segment 

 subacute but concealed by that of the preceding segment. Telson equi- 

 laterally triangular, a little longer than the preceding segments of the abdo- 

 men, the lateral margins concave near the bases of the uropods, but 

 otherwise nearly straight; tip rounded and furnished with short spines which 

 are longest near the center and extend only a short distance along the sides. 



Head transverse, the front broadly and evenly rounded, the frontal 

 margin raised; a transverse impressed line extending across the front part of 

 the head from the upper sides of the eyes. Antennules reaching the pos- 

 terior margin of the head, the peduncle reaching the anterior border of the 

 eye and beyond the tip of the third joint of the antennae but scarcely to the 

 middle of the fourth; first joint rounded, about as wide as long; second joint 

 a little longer than wide; third about as long as the first 2; flagellum about as 

 long as the base and composed of 10-16 articulations. Antennae about half the 

 length of the body; fifth joint slightly longer than the fourth, and about equal 

 in length to the first 3; flagellum nearly twice the length of the peduncle. 



