ACADEMY OF SCIENCES. 31 



longer upon the margins of the limbs and forming a lamellate protuberance 

 over the rostrum. Length, 0.65; width, 0.45; length of 2d pair of feet, 0.80. 



Lambrus frons-acutis. 



Carapace, transverse, somewhat pentagonal, each antero-lateral border 

 having a rounded angle in the centre of its length; and the postero-lateral 

 border forming an almost straight line with the posterior border. Rostrum, 

 pointed, prominent, elevated, continuous with the elevated gastric region. 

 A prominence at the cardiac region. Branchial regions prominent, each 

 capped with a line of tubercles extending outward to the angle between antero 

 .and postero-lateral borders. Antero-lateral border finely toothed and ter- 

 minating behind in an acute point. The portions of the carapace between 

 the prominences are much depressed and perfectly smooth. Arm, carpus 

 and hand of the first pair of legs, trigonal in section, each angle set with a 

 continuous row of small tubercles. Dactylos turned inwards almost per- 

 pendicularly to the hand, very small. A single dried specimen brought 

 from Santa Catalina. Length, 0.50; breadth, 0.70; breadth across arms 

 when bent, 1.33 inch. 



Xantho spini-tuberculatus. 



Front four-lobed, areolets of anterior and antero-lateral portions of carapace 

 prominent; six teeth on antero-lateral margin, including that of posterior 

 angle of orbit; chelipeds covered with smooth shining tubercles on the upper 

 portions, those of the hand arranged in seven longitudinal series; fourth and 

 fifth Joints of the four hinder pairs of limbs beset with spines on their supe- 

 rior portions. 



Specimens from Santa Eosa, presented and collected by W. G. W. Harford. 



Specimens from Monterey, presented and collected by J. G. Cooper. 



Specimens from San Diego, presented and collected by Henry Hemphill. 



Length of carapace of male, 0.44 width, 0.63 

 female, 0.38 " 0.57 



Xantliodes latimanus. ' 



Front sinuate, the inner angle of the orbit raised into a point; carapax but 

 slightly transverse; teeth N. T. S., prominent and pointed, D and E almost 

 obsolete. Areolation of medial and antero-lateral regions distinct, the former 

 having the parts 2 M, and 3 M entirely outlined. Hands, sub-equal, the right 

 somewhat the larger; movable fingers very long, and curved abruptly down- 

 ward; margin of manus continuous with the broad base of the fixed finger so 

 as to form a sinuous sloping line; hinder feet compressed. This species may 

 be readily identified by the delicate marbling of the carapace and chelipeds, 

 and the downward bend of the movable fingers. Abdomen of male, five 

 jointed. 



A single male specimen from San Diego. Length, 0.73; breadth, 0.88. 



Xanthodes Hemphillii. 



Front almost entire, slightly waved and somewhat produced; carapace, 

 transverse, medial region prominently outlined; 1st antero-lateral tooth (D), 



