34 G- 0. Sårs. 



segments, each of which form an inward-projecting masticatory- 

 lobe. The proximal lobe is rather thin, lamellar, and is 

 tipped with 4 ciliated setæ, the 2nd and 3rd of which are 

 rather elongated. The distal lobe is much coarser, and is 

 transversely truncated at the tip, which is armed with a 

 number of strong spines. The palp issues from the distal 

 segment of the basal part, and is turned somewhat out- 

 wards. It is composed of 2 flattened joints, the 1st of 

 which carries 2 ciliated setæ inside. The 2nd joint is some- 

 what longer than the 1st, and is provided with 4 curved 

 setæ, 3 of which issue from the obliquely truncated tip, 

 the 4th from a separate ledge of the inner edge. The 

 exognath forms a very small, knob-like prominence, 

 apparently issuing from the end of the proximal segment 

 of the basal part outside. It carries 4 densely plumous 

 setæ, the posterior of which is rather elongated and re- 

 curved. 



The posterior maxillæ (fig. 10) are of more simple 

 structure, and without any trace of an exognath. The 

 basal part here too seems to be composed of 2 segments, 

 and projects inside in several very short setiferous lobes, 2 

 on the proximal segment, 3 on the distal one. The palp is 

 represented by an undivided terminal joint carrying 3 setæ, 

 2 apical and 1 lateral. Outside the joint, a single ciliated 

 seta is seen issuing from the end of the basal part, and 

 perhaps answering to the exognath. 



The maxillipeds (fig. 11), which in the adult animal, as 

 is well known, exhibit a fully pediform structure, are in 

 this stage scarcely larger than the maxillæ, and are con- 

 structed upon a similar type. They each consist of a 

 rather large flattened basal part, which is divided into 2 



