AKD ANUROPUS BEANCHIATUS. 25 



in his fig. 1 on pi. 6, representing the first left pleopod. I will 

 add that these setae are the coupling-hooks met with in Girolana 

 and most other Isopoda ; in Batli. giganteus the anterior hooks 

 are moderately long, the posterior ones exceedingly long, and at 

 least the posterior ones have their apical part so much altered, 

 that I doubt whether they can really be used as hooks coupling 

 together the two peduncles of the same pair. These subsetiform 

 hooks are found, as in Girolana, on the four anterior pairs, but 

 not on the last pair of pleopods. On the shape and structure of 

 the pleopods with their supplementary branchise, the reader is 

 referred to the exhaustive account of the French author. 



EXPLANATION OP PLATE 4. 



Figs. 1-7. Anurojnis hrancliiatus, Beddard. 

 Fig. L Head from in front and somewhat from below, x 4. a, transverse 



groove ; b, place of insertion of the right antennula ; c, left antennula ; 



d, left antenna ; e, transverse wall below the groove ; /, clypeus ; 



g, labrum ; h, mandible ; i, mandibular palpus, the third joint broken 



off. 

 Fig. 2. Head from below and somewhat from behind, e, transverse wall ; 



/, clypeus ; g, labrum ; h, mandible ; i, mandibular palpus without its 



third joint ; Jc, left wing of the paragnatha ; I, maxillula; m, maxilla ; 



n, basal joint of the maxilliped ; o, epipod from the basal joint. 

 Fig. 3. Distal part of the left mandible from below and partly from the inner 



side, c, cutting-edge ; I, rudimentary laeinia mobilis ; m, molar 



process. 

 Fig. 4. Eight maxillula from below, the basal part omitted. i?\ lobe from the 



first joint ; P, lobe from the third joint. 

 Fig. 5. Eight maxilla from below, l^, lobe from the third joint. 

 Fig. 6. Eight leg of the first pair, from below, nearly X 4. 2, second joint 



(the first joint fused with the thorax) ; 7, seventh joint ; c, claw. 

 Fig. 7. Distal part of the right leg of the fourtli pair, from below, x f. 



4, fourth joint ; 7, seventh joint ; the claw has been broken off. 



Figs. 8, 9. Bathynomus giganteus, A. M.-Edw. 

 Fig. 8. Portion of the upper surface of the head, with the organ surrounded by 



glabrous chitine without impressed points, x 3. 

 Fig. 9. Basal part of the left antenna, from below and somewhat from the side, 



scarcely X 3. 1, first joint ; 2, second joint ; 3, third joint ; a, skeleton 



of the head ; m, articular membrane. 



