rUAWNS I'ROJl J^AlvlO TANGANYIKA. 431 



The eyes are of very large size and somewhat project be}on(l 

 the lateral faces of the carapace (fig. 1). They are, however, 

 like those in the preceding larva, still imperfectly separated in 

 the middle and apparently quite immobile. The corneal part is 

 well defined and contains a semi-oval assemblage of a dark pig- 

 ment, from which numerous distinctly developed visual elements 

 radiate. The ocellar lobe is i«ii-tly visible in the dorsal aspect of 

 the animal immediately in front of the eye-bases, but appears 

 more distinctly on viewing the animsd from the ventral face. 



As to the appendages, fig. 3 will give a general view of their 

 form and arrangement in the present larva. On comparing this 

 figure with fig. 3 on PI. LVII., it is at once seen that both 

 the antennulte and the antennse are considerably larger and also 

 more advanced in development. On the other hand, the oral 

 parts (antei'ior and posterior li[)s, mandibles and maxilhe) are 

 very little difierent. The same is also the case with the three 

 pairs of maxillipeds ; but these appendages appear in the present 

 larva more densely crowded and more remote from the hind limit 

 of the inesosome, a considerable space being left behind them, 

 which is occupied by three additional pairs of limbs not found in 

 the preceding larva. These limbs, representing the three anterior 

 pairs of legs are, however, still only in process of formation, being 

 quite immobile and folded beneath the mesosome. 



The metasovie (figs. 1 & 2) is not fully twice as long as the 

 anterior division of the body, and, as in the pi'eceding larva, 

 consists of six segments, the last of which is very narrow in its 

 anterior part, V)ut gradually expands distally, to form the caudal 

 plate. The latter is comparatively smaller than in most other 

 Caridean larva^, and looks rather different fiom that in the pre- 

 ceding larva, not being cleft into two lobes, but only slightly 

 emarginated behind in the middle (see also fig. 11). Each half 

 of the plate carries the usual number of marginal seta?, viz. 7, 

 the outermost and innermost ones being luther small, the 

 others nearly equal-sized and compaiatively shorter than in the 

 preceding larva. Of ni-opoda or pleopoda no traces are to be 

 found. 



Structure of the Appendages. 



The aniemiulo' (fig. 4) have the peduncle rather prolonged and 

 of cylindrical form, with a slight indication of subdivision into 

 three joints. The outer flagellum, as in the preceding larva, 

 consists of a single oblong oval joint carrying on the lip four 

 unequal bristles, the innermost one distinctly ciliated. The inner 

 fiao-ellum, as in most other Caridean Zoete, is replaced by a strong 

 ciliated seta attached to the inner distal corner of the peduncle. 

 This seta, however, scarcely exceeds half the length of the 

 peduncle, whereas in the earliest stage of Caridina n'dotica it is, 

 according to Prof. Daday, nearly twice its length. 



The antenna' (fig. 5) exhibit the three principal parts well 

 defined. Tiie basal part scarcely differs in structux'e from tliat in 



