New Genus of Terrestrial Isopoda. 15 



epimera of the seventh segment and beyond the level of the joint 

 between the basos and ischios of the seventh appendage. There 

 is a tendency for the breadth of the segments to increase as they 

 pass posteriorly, and this increase is most marked in the fifth 

 segment. The pleura of the second, third, fourth and fifth 

 segments are produced downwards further than those of the first 

 and are about equal to their respective segments in depth. 



The sixth segment and telson are coalesced, forming a tail- 

 piece slightly concave below and convex above in both transverse 

 and longitudinal section ; the sides are flattened and the whole 

 structure has a characteristic horse-shoe shape in transverse 

 section. The posterior end is truncated and gapes widely. The 

 margin of the posterior end is bordered by a series of strong, 

 spinose setae of varying length. The shape of this part of the 

 body is markedly different from that of any of the three species 

 of Phreatoicus yet described. 



From the level of the upper and posterior ansde of the insertion 

 of the uropod a ridge, devoid of seta?, extends upwards and for- 

 wards for about half the height of the body, probably indicating 

 the posterior limit of the sixth segment. 



The inferior and posterior margins of the pleura of segments 

 1-5 bear a few short, spinose setae, a sparse, narrow row of 

 which is continued around the posterior margin of the segment. 



The anterior inferior angle of the sixth segment is produced 

 into a process, which bears a single strong spine. 



The inner side of the basal part of the appendage is produced 

 so as to form a process running along the inner side of the inner 

 ramus, and bearing a few short spines. 



Surface of Body. — The surface of the body is smooth, with only 

 a very few short setae scattered about irregularly. The whole 

 surface of the body has a light cream colour in spirit specimens. 



First Antemne. — The first antenna 1 are short, reaching more 

 than half way along the fourth joint of the second antennae. 



The peduncle consists of three joints, and is clearly dis- 

 tinguishable from the flagellum. The first joint of the peduncle 

 projects freely beyond the head. It is broader than long and 

 about the same length as the second. The third is shorter and 

 narrower. 



The 'flagellum consists of from ten to twelve joints. The second 

 segment is the largest. The succeeding ones are about equal in 



