1. '08. 



22 



The antennal scale is widest basally and about three times 

 as long as broad. The outer margin is straight or very slightly 

 concave, and terminates distally in a strong spine which 

 reaches as far as, or slightly beyond, the narrow apex of the 

 lamellar portion. 



The mandible (fig. 4) is provided with a large two- jointed 

 palp; both joints are approximately triangular in shape, the 

 ultimate being considerably longer than the penultimate. 

 The endopod of the first maxillae (fig. 5) is hooked at its apex 

 and bears a small round setiferous lobe at its base. In the 

 second maxillae (fig. 6) the broad endopod is apically emar- 

 ginate and is provided with numerous short stout spinules on 

 its inner distal aspect ; the basal lobe of the exopod is broadly 

 rounded. The endopod of the first maxillipedes (fig. 7) is long 

 and filamentous, but its inner margin is much widened near 

 the base ; the exopod is narrow and lanceolate. The second 

 maxillipede (fig. 8), which, like the first, bears a large epipod, 

 is provided with a podobranch and tw'o arthrobranchs. The 

 exopod is short, reaching to about half the length of the 

 merus. The outer maxillipedes are very long, reaching 

 beyond the antennal scale ; their exopods are very short. 



The first pair of pereiopods is short and rather stout, reach- 

 ing almost to the tips of the eyes ; the third pair is much longer, 

 with a long and slender carpus, and reaches to the apex of the 

 antennal scale. The second pair is intermediate, as regards 

 length, between the first and third. A stout spine is present 

 on the inferior aspect of the basus of the first two pairs, and 

 a similar spine is also present on the lower margin of the 

 ischium of the first pair. The fourth pair of pereiopods is 

 stouter and rather shorter that the fifth, the latter, w'hen 

 stretched forwards, reaching to the tips of the eyes. 



All the pereiopods bear long exopods and large foliaceous 

 epipod s are present on the first four pairs. The branchia/1 

 formula is — 





vn. 



vm:. IX. 



1 1 

 X. ' XL 1 XIL 



i 



XTTT. XIV. 



Podobranehiae, 



Arthrobranchiae, 



Pleurobranchiae, 



ep. 



l+ep. ep. 

 2 2 

 1 



> 

 ep. ep. 



2 2 



1 1 



i 



ep. 

 2 



1 



ep. 

 2 

 1 



1 



The petasma attached to the first pair of pleopods" of the 

 male is very large, and consists of two plates with numerous 

 vertical folds. These two plates are firmly connected in- 

 ternally for about half their basal length by means of a series 

 of small hooks or cincinnuli. Each plate is divided distally 

 into two lobes, the outer of which is longer and more pointed 

 than the inner. Normally the w^hole structure forms a rough 

 tube, the two outer edges being capable of approximation 

 owing to the numei'ous vertical folds. Fig. 2 shows the ap- 

 pearance of the petasma seen from behind, and slightly flat- 

 tened. 



