594 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



This species resembles Cirolana harfordi'^ (Lockington), but is 

 readily distinguished from it by the bizarre color pattern and the 

 different posterior margination of the head. The present species has 

 the first abdominal segment only partly concealed and the second ab- 

 dominal segment not at all concealed, while Cirolana harfordi has the 

 first two abdominal segments entirely concealed. 



Family EXCORALLANIDAE. 



EXCORALLANA BERBICENSIS, new species. 



Plate 92, fig. 1. 



Body ovate, three and one-fourth times as long as wide, 13 mm., 

 4 mm. 



Head wider than long, 3 mm., 2 mm., with the anterior margin 

 widely, evenly rounded, and the posterior margin straight. The 

 eyes are large, composed of large ocelli, occupy the sides of the head, 

 and are separated in front by a distance equal to the length of one 

 eye. The first pair of antennae have a peduncle of two articles each 

 about 0.5 mm. long and a flagellum of 11 short, subequal articles, 

 and extends almost to the fifth article of the second antennae. The 

 second pair of antennae has the first, second, and third articles very 

 short, subequal, the fourth and fifth articles about equal, each as long 

 as the first three taken together, a flagellum of 25 short, subequal 

 articles, and extends to the middle of the fourth thoracic segment. 



The left mandible is distinctly bidentated, interlocking with the 

 right mandible. 



Thorax : The segments are subequal ; the epimera are distinct on all 

 except the first segment; the first two are rounded posteriorly, the 

 last four have the outer posterior angle gradually more acutely pro- 

 duced. The first three pairs of legs are prehensile, the last four are 

 ambulator}^; all have the inner margin beset with short, stout spines. 



Abdomen : The first segment is about half concealed by the thorax ; 

 the second, third, and fourth are subequal in length but have the 

 outer posterior angle gradually more produced; the fifth is longer 

 than the preceding segment, by which it is almost entirely overlapped 

 on either side ; it is ornamented by two blunt tubercles, one on either 

 side of the median line ; the posterior margin is produced to a median 

 point, giving the segment a triangular appearance ; the sixth segment 

 is triangulate with the apex evenly rounded and ornamented near the 

 base with four almost invisible tubercles, one on either side of the 

 median line and one near the base of the peduncle of each uropod. 



The peduncle of the uropod is short and bears a tubercle near the 

 outer angle ; the larger, inner branch is broadly rounded posteriorly, 



'^ Aega harfordi Lockington, Proc. Cal. Acad. Sci., vol. 7, 1877, pt. 1, p 46. Cirolana 

 harfordi Richardson, Proc. U. S. Nat. Mus., vol. 21, 1899, pp. 822-823. 



