422 DISCOVERY REPORTS 



Stage IX?. Length 12-5-15 mm. 



Abdomen broadened at base; telson marked off, with large spinous process at each 

 angle. 



Eye about one-third of body length. Antennule, segments of peduncle the same, 

 endopod and exopod longer. Antenna with peduncle distinctly segmented, with inner 

 spine of segment 3. 



Maxilla unchanged; maxillipede i a small papilla. Maxillipedes 2 and 3 without 

 exopod. 



Pleopods present as small simple lobes ; uropods larger, but generally simple. In some 

 cases a distinction of endopod from exopod is traceable. 



Stage X?. Length 15-17 mm. 



The only marked difference between this and the preceding stage is that the uropods 

 are distinctly bilobed, but there is an increase in length of the endopod of the antennule 

 and of the antenna which is shown in Table VIII. 



While the maxilla is generally unchanged, it may, in the largest specimens, show 

 enlargement of the exopod, which may have seven setae. 



Stage XI ?. Length 19-23 mm. 



Abdomen stout, the telson narrowing and rounded at end, without spines. 



Eye less than one-third of body length. 



Maxilla with exopod greatly enlarged, with about eleven setae, but not reaching back 

 as far as maxillipede 2. Maxillipede i larger, but still a simple process. Maxillipedes 2 

 and 3 without exopods. 



Pleopods larger, bilobed ; uropods nearly as long as telson, biramous, but the rami 

 not segmented. There may be a trace of a joint at the base of the exopod. 



Stage XII }. Length 27-31 mm. 



This stage differs very little from stage XI except in general growth as shown by the 

 measurements, but may easily be distinguished by the larger, biramous, pleopods with- 

 out trace of appendix interna, and the larger uropods. The exopod of the latter is 

 distinctly jointed, and the outer margin smooth. 



Telson as before, with smooth margin. 



Stage XIII ? (Fig. 29). Length 33-37-5 mm. 



Maxilla with exopod extending back to maxillipede 2. Maxillipede i with large 

 epipod and finger-like process representing endopod. Maxillipede 2 with rudimentary 

 exopod. Maxillipede 3 with small knob representing exopod. Small epipods and gills 

 present on legs in full adult number. 



Pleopods large, flattened, with appendix interna on each. Uropods slightly longer 

 than telson, the rami jointed to basis, exopod serrated on outer margin. 



Telson truncated, with small sharp points along margin. 



This, which is without doubt the last stage before the moult to the Puerulus, has been 

 fully described by Gilchrist. He drew attention to a peculiar elevation dorsally behind 



