110 DR. J. D. F. GILCHRIST ON LARVAL AND 



The second maxilla (fig. 22, p. Ill) has increased greatly, chiefly in its 

 distal segment, which has altered also much in shape. It has become 

 expanded and produced posteriorly, so as to assume a foot-like shape. The 

 first segment is also enlarged and slightly produced anteriorly. 



The first maxillipede (fig. 23, p. Ill) now appears, or rather reappears, in 

 the form of a small stump, with two slight projections. It has, however, 

 altered its position, being removed from the base of the second maxillipede 

 and nearer that of the second maxilla, slightly overlapping it on the inner 

 side. The rudiment of the exopodite is well marked under the cuticle. 



The second maxillipede consists of five distinct segments as before, but 

 about the first third of its length is a slight bulging on the posterior side, 

 with a smaller one a little further on the anterior ; these are apparently the 

 first traces of the joint and exopodite which appear at this point in later 

 stages. 



The tJiird maxillipede is very long and consists of seven distinct segments ; 

 there is no trace of an exopodite, except a slight bulging as before. 



The abdominal region consists of four segments provided with pleopods 

 with a simple biramose termination^ the last with uropods and the terminal 

 telson. 



Phyllosoma of 26 mm. 

 Does not differ much from that of 24 mm. 



Phyllosoma of 33 mm. 



This stage is well characterised by the appearance of the gills, the rostral 

 elevation, and the demarcation of the first segment of the antenna from the 

 body. A further description of these will be given in considering the next 

 size, of which more perfect specimens are available and which does not 

 seem to differ essentially from this stage. 



Phyllosoma of 35 mm. [Fig. 24] PI. 16. 



The total length is 35 mm. The length of the shield is 21 mm., breadth 

 22 mm., and it reaches to a line joining the centre of the bases of the second 

 pereiopods. The greatest breadth of the thorax is 10'8 mm. 



A feature not apparently observed in any phyllosoma hitherto described is 

 the beginning of the rostral elevation, not a simple prominence as in the 

 adult, but having a central projection with one in each side (fig. 25). 



The liver is well developed and consists of numerous diverticula. 



The eyes are on long stalks with a constriction near their distal end. 



The antenimles are well developed ; the flagella are thick-segmented and 



