DEVELOPMENT OF EUPHAUSIA SUPERB A 93 



dorso-ventral aspect the telson as a whole tapers from in front tailwards, except in the 

 region of the insertion of the postero-lateral spines where there is a sUght widening. 

 The innermost postero-lateral spines are widened over a greater portion of the length 

 than previously but tapered distally to a point. A few small bristles are found on the 

 inner margin near the tip, but the dorsally projecting spinule has disappeared. The 

 uropods are more setose than in the previous stage. 



Table XXXV. Occurrence of Fifth Fiircilia 



3 terminal spines on telson 



Antennule. The flagella are greatly elongated, being nearly twice as long as the two 

 distal peduncular segments. The dorsal lobes on the distal margin (dorsally) of the first 

 and second basal segments are more pronounced than formerly (Fig. 23 b, d). The lateral 

 spine on the first segment is reduced in size ; this segment bears a number of bristles 

 dorsally and on the outer margin. 



Antenna. The diff'erentiation of the rami of the antenna into scale and flagellum is 

 complete (Fig. 23 e). The outer ramus forms a roughly oblong lamella with bristles 

 along the inner and distal margins. The inner ramus consists of two peduncular seg- 

 ments and one or more flagellar segments according to the size of the larva, as shown on 

 p. 64. The peduncle is articulated with the second segment of the protopodite in such 

 a way that it appears at first sight as if the inner ramus had three peduncular segments. 

 The insertion of the scale low down on the side of the second protopodal segment em- 

 phasizes this appearance. The proximal segment of the protopodite has a spine pro- 

 jecting forwards from the outer corner. 



Mandible. The lacinia mobilis is still present but very small and degenerate. The 



