REPORT ON THE ISOPODA. 83 



with respect to the longitudinal axis of the body in the successive segments. The 

 length of the thoracic spines is very considerable ; anteriorly and posteriorly they are 

 nearly equal in length to the diameter of the body ; in the middle segments they are 

 about equal in length to half the diameter of the body. 



These epimeral spines are furnished with four rows, equidistant from each other, of 

 short transversely arranged spines (see fig. 4) ; proximally these spines are set at right 

 angles to the longitudinal axis of the epimeron, distally they are inclined to it at a less 

 angle ; the whole surface of the body is covered with similar spines, which are also found 

 upon the head. 



The abdominal shield is oval in outline, it is prolonged behind into a long telson spine 

 which is about equal in length to the shield itself ; there are two pairs of lateral spines 

 which are about equal in length to the telson spine ; the first pair of these is 

 directed backwards, though its. curvature, as in the thoracic epimeral spines, is rather 

 forwards ; the last pair is not only directed backwards, but the curvature is backwards. 

 The abdominal shield as well as its lateral and posterior spines are densely covered with 

 short spines like the thorax. 



The posterior pair of spines overlies the articulation of the uropoda ; another spiny 

 process, not quite so long as the first, springs from behind the articulation of these 

 appendages ; it corresponds almost exactly in direction to the dorsal spine. 



The antenmdes (PL VIII. fig. 5) are very different indeed from those of the last 

 species, but I am unable to give a very accurate representation of them owing to the fact 

 that part of the peduncle is hidden in the specimen. The drawing of these appendages 

 cannot, however, be very far wrong ; the only fact that I cannot state for certain is the 

 presence of the fourth joint in the peduncle, and judging from the analogy of the Asellidse 

 and other Munnopsidfe, it is in all probability present. The basal joint of the peduncle is 

 very large, as is characteristic of the family ; the remaining joints are small, the flagellum 

 is extremely short in comparison with that of the last species, and only consists of four 

 somewhat elongated joints. 



Of the antennas I have not thought it worth while to give a separate drawing, as they 

 appear to agree so closely with those of the last species, the basal joints of which are 

 shown in fig. 8 of PL VIII. ; the spines upon the basal joints may perhaps be a trifle 

 longer in proportion ; both antennae are incomplete, like those of Acanthocope spinicauda, 

 and have been broken off at the same point. 



The mouth appendages are obscured, owing to the method of preparation of the 

 specimen, so that I am unable to give any description of them. 



The two first pairs of thoracic appendages are subequal in length, they are shorter as 

 well as more slender than the succeeding appendages, which are not, however, remarkable 

 for their length, and are nothing like so elongated as are the same appendages in 

 Munnopsis typica. 



