166 Miss H. Richardson on the Isopods of the 



Head with a small median point. Eyes large, situated but 

 a little distance apart. First pair of antennae, with a flagel- 

 lum of" about nine articles, extend to the antero-lateral angle 

 of the first thoracic segment. Second pair of antennae broken 

 in specimen. 



Fio-. 4. 



Corallana truncata. x 13|. 

 a, head ; b, abdomen and last thoracic segment. 



First segment of the thorax is as long as the head, and 

 about one and a half times longer than any of the other 

 segments. Epimera of the second and third segments 

 narrow ; those of the remaining segments very broad. 



The first abdominal segment is almost entirely covered by 

 the last thoracic segment. The second, third, and fourth 

 segments are tuberculated on their posterior margins. The 

 fifth segment is also tuberculated, the tubercles on either side 

 of the median line of tubercles being larger and more con- 

 spicuous. At the base of the terminal segment are four 

 tubercles, the two centre ones being the larger. The ter- 

 minal segment is subtriangular with truncate apex. The 

 posterior margin is armed with spines. The inner branch of 

 the uropoda is truncate posteriorly and armed with spines ; 

 it is about twice as broad as the outer branch, which is 

 lanceolate in shape. 



There is but one specimen, from Catalina Island, Cali- 

 fornia ; collected by Dr. J. G. Cooper. 



Type, No. 22566, U.S. N. M. 



Family V. JSgidae. 

 Analytical Key to the Genera of ^gidge. 



a. Body rather compact. Superior antennae short, with 

 first two peduncular joints more or less expanded. 

 Epistome large, linguiform, projecting between the 

 bases of inferior antennae. Maxillipeds with palp 

 composed of five joints. Anterior pairs of legs with 

 propodus simple, cylindrical, not expanded, dactylus 

 abruptly curved in middle. Front separating the 

 whole or a great part of the first article of the first 

 pair of antennae. Flagellum of first pair of antennae 

 composed of many articles. Abdomen compact , . . 6. ^ga. 



