EEPOET ON THE ISOPODA. SI 



furnished with long spiniform epimera, which, like those of the preceding segment of the 

 thorax, are curved forwards, with the exception of the last segment, where they are 

 directed backwards ; the epimera, instead of arising above and to the outside of the 

 limbs, as in the second, third, and fourth segments, arise in front of the attachments 

 of the latter. Each of the three posterior segments of the thorax (with the possible 

 exception of the first) has a pair of long spines, one on either side of the dorsal median 

 line, arising on the anterior region of the segment, the sixth segment had on one side of 

 the body a ventral spine arising below the attachment of the limb and exactly under- 

 lying the epimeral spine ; these are probably present in the other segments, but I did 

 not succeed in seeing them. 



The abdominal shield is oval, and terminates in the long spiniform telson. 



At the commencement of the abdominal shield is a long, single, median spine on 

 the dorsal surface ; a single pair of lateral spines are placed about halfway between the 

 commencement of the shield and the attachment of the uropoda ; just in front of 

 the latter are another pair of spines longer than the anterior pair, and like them directed 

 somewhat backwards as well as outwards. Below these and arising just behind the anus 

 are another pair of shorter spines, not more than one half the length of the former ; 

 the uropoda are attached exactly between the two spines of each side. These relations 

 are shown in fig. 11. 



The antennules (PI. VIII. figs. 6, 7) are comparatively long, nearly as long as the 

 body minus the telson, and are furnished with a very long multiarticulate flagellum, 

 many times the length of the peduncle. 



Of the antennas (fig. 8) only the three basal joints have been preserved, these are 

 short and subequal in length ; each of the first two is prolonged into a stout spine on 

 either side of its articulation with the succeeding joint ; the inner spine is in each case 

 rather longer than the outer spine. 



The mandibles are complicated and consist of two distinct portions besides the palp. 



It must be remembered, however, that the interpretations here given may very 

 possibly be erroneous, as it is naturally rather difficult to study the mouth appendages 

 satisfactory in situ. 



On comparing the figure of the mandible of this species with that of Eurycope 

 sarsii, it is seen to consist of the same parts, but the masticatory process, which 

 almost exactly resembles in shape the mandible of Serolis, 1 is much stouter. 



The upper half of the mandible is markedly asymmetrical ; the left hand mandible 

 has several teeth-like processes which are wanting in the mandibles of the right side. 



The remaining appendages of the mouth do not appear to be in any way remarkable. 



Tke/thoracic limbs are, as in the genera Munnopsis and Eurycope, specialised into an 

 anterior and a posterior series. 



1 Op. cit, Zool. Chall. Exp., part xxxiii. pi. iii. fig. 9. 

 (ZOOL. CHALL. EXP. PART XLVIII. — 1886.) Ebb 11 



