8 Gt. 0. Sårs. 



The form of the anterior division is nearly unaltered, 

 whereas the posterior one has changed from the original 

 regular oval form to an almost cylindrical shape, and now 

 considerably exceeds in length the anterior. It terminates 

 in 2 short, juxtaposed projections (the furca), separated 

 by a small sinus, in which the anal orifice has been formed, 

 but is otherwise quite simple, without any trace of segment- 

 ation or of true appendages. As in the preceding stage, it 

 is for the greater part filled with an opaque granular mat- 

 ter, whereas the anterior division has become considerably 

 more transparent. 



The ocellus, as also the antennulæ, both in this and in all 

 the succeeding larval stages, does not exhibit any changes 

 whatever. 



The antennæ, on the other hand, appear somewhat more 

 fully developed, all the setæ being now densely plumose. 

 Moreover each of the rami has acquired an additional seta, 

 the number of the setæ being accordingly on the outer 

 ramus 5, on the inner 4, the latter issuing all close together 

 from the tip of the ramus. The basal process has assumed 

 the form of a strong falciform seta, originating with a 

 thickened base from the lower face of the scape, and having 

 its outer part densely ciliated. The seta at the end of the 

 scape has also become considerably stronger, and is likewise 

 distinctly ciliated. 



The mandibular feet have preserved their form and 

 size unaltered; but the short spiniform appendages found 

 in the preceding stage are now transformed into bristles, those 

 issuing from the inner edge being densely ciliated. The 

 mandibular bodies are more distinctly developed, with their 

 masticatory part in process of formation. 



The labrum (see fig. 4) exhibits a similar shield-like 



