164 Miss H. Richardson on the Isopods of the 



pair of antennae, with a flagellum of thirteen long joints, 

 extend to the posterior margin of the fifth thoracic segment. 



The first three segments of the thorax are short; the other 

 four segments are long. The epimera of the second, third, 

 and fourth segments are not produced at the apex ; those of 

 the fifth, sixth, and seventh but slightly produced. 



All the abdominal segments conspicuous, the first five 

 being of equal length. The terminal segment is rounded 

 posteriorly, faintly crenulate, and fringed with long hairs. 

 The base of this segment is raised above the other portion 

 and has a well-defined edge with two points extending back- 

 ward, one on either side of the median line. The uropoda 

 extend beyond the tip of the abdomen ; the inner branch is 

 obliquely truncate ; the outer branch is more rounded ; both 

 branches are fringed with long hairs. 



The prehensile legs are short ; the gressorial legs are long 

 and slender. The legs increase gradually in length from 

 the first to the seventli pair. 



Two specimens, from Monterey Bay, California, collected 

 by Mr. Heath from sandy shore at mean tide. 



Type. No. 22564, U.S. N. M. 



4. EuRYDiCE, Leach. 

 6. Eurydice caudata, sp. n. 



Body elongate and narrow. In male abdomen is equal in 

 length to thorax ; in female it is shorter. Surface of body 

 smooth. 



Head widely rounded in front ; its anterior margin narrowly 

 thickened. Eyes large and round, and situated at a distance 

 of one third the width of the head apart. First pair of an- 

 tenngp, extend to the posterior margin of the head ; flagellum 

 contains five articles, the first of which is very long and those 

 following quite short. The second pair of antennae extend as 

 far as the posterior margin of the fourth segment of the 

 abdomen ; the flagellum consists of twenty-five long slender 

 joints. In the female the second pair of antennee are much 

 shorter, reaching only to the posterior margin of the last 

 thoracic segment ; the flagellum contains about twenty 

 joints. 



The thoracic segments are subequal. The epimera are 

 narrow, and those of the last three or four segments acutely 

 pointed. 



All the abdominal segments are visible in a dorsal view. 

 The terminal segment is rounded at the sides and truncate at 



