FIG. 241. Central Xervous 

 Systems of various Crus- 

 tacea. A Euphausia pel- 

 lucidi (after G. 0. Sars). 

 B Astacus fluviatilis (after 

 Vogt and Yung). C Ap- 

 seudes Litreillii (combined 

 from several figures by 

 Claus). D Limnadia (after 

 Klunzinger), anterior por- 

 tion. F Maia squinado 

 (after Milne Edwards). 

 a' nerve of first antenna ; 

 2 of second ; ayj (in -D) 

 ganglion of the second 

 antenna ; au nerve to 

 paired eye ; bg suboeso- 

 phageal ganglion, con- 

 sisting of several fused 

 neuromeres ; cy co minis - 

 sural ganglion ; g brain ; 

 go optic ganglion ; m (in 

 F) stomach ; md mandi- 

 bular ganglion ; mx and 

 mx2 ganglia of first and 

 second maxillae ; s vis- 

 ceral nervous system ; sc 

 oesophageal commissure ; 

 sg (in F) visceral ganglion, 

 ua nerve to median eye ; 

 y post-oesophageal com- 

 missure (? of ganglia of 

 2nd antennae). I-VIII 

 thoracic ganglia ; 1-6 ab- 

 dominal ganglia. (From 

 Lang.) 



