9° 



DISCOVERY REPORTS 



Table XXXIII. Occurrence of Fourth Fur cilia 



5 terminal spines on telson 



Mandible. The lacinia mobilis is still present in the mandible. The palp is three- 

 segmented, and in the specimen figured has two spines on the apex of the distal segment 

 of the one, and only one on the other (Fig. 21 g). The variation in the number of spines 

 in the distal segment is dealt with on p. 65. 



First maxilla. The palp of the ist maxilla is unsegmented with seven bristles from 

 the apex along the inner margin. There are two less conspicuous bristles on the outer 

 side of the palp. The masticatory lobes are very similar to those found in the previous 

 stage but with ten marginal bristles on the outer lobe. The pseudexopod rudiment is 

 visible but not conspicuous in the region of the larval exognath (Fig. 21 //). 



Second maxilla. The terminal palp of the 2nd maxilla (Fig. 21 j) has four bristles 

 extending from the tip along the inner margin. On the outer side of the maxilla, where 

 the palp is articulated, there is a little rounded process bearing two setae : this is the 

 exopod. The segmentation of this appendage into three basal segments {vide Hansen's 

 Studies on Arthropoda, 11, 1925, pi. xii) is not clear. 



