Table of Post-oral Neeve Ganglia of Decapodous Crustacean, of Macrurous Arachnidan, and of Lepidopterotjs 

 Insects, as observable in developing and in adult individuals op the genera 

 AsTACUs, Scorpio, and Sphinx. 



Table of Post-oral Nerve Ganglia as observable in Amphipodous and Isopodous Crustacea and in 



Orthopterous Insects. 



Amphipodous Crustacea, Talitrus, Milne-Edwards 



and Spenoe Bate, Amphithoe, Bruzeliue, Uypcria, 



Straus Durckheim, Gammarua Pulex, mihi. 



Post-oral ganglion gives branches to jaws, is not ftcrured 

 by Straus Durckheim in Mem. du Museum, 1829, 

 torn, iviii., in Hyperia Galba. But see BruzeUus' 

 figures. Arch, fur Naturgeschichte, 1869, Taf. x., fig. 

 18. 



I Fused in Hyjicria mth each other 



Ist Ambulatory foot 1 ' 



*- and with i. api>roximating De- 

 capodous arrangement. 

 Distinct ganghon 



I 



i. 7th 

 1st Pleopodos „ „ 



2nd 



Srd „ „ ", 



4th Pleopodos. Distinct ganglion according to Spence 

 Bate in Talitrus Locusta; but in Talitrus, Hyperia, 

 and Amphithoe, as figured by Milne-Edwards, De 

 la Valette, and Straus Durckheun, and in Gamma- 

 rus Pulex where it is much elongated, supplying the 

 5th and Gth Pleopodos also. 

 1. 5th Pleopodos. Distinct ganghon in Talitrus Locusta, 

 Spence Bate, in British Association Report, 1656, p. 5e 

 PI. xxii. 



Isopodous Crustacean, Oniacm Asellua, Woodlouse, 

 Leydig, 1. e. Taf. iv. 7. 



Post-oral ganghon, vei-y small and ordinarily overlooked. 

 The nerves for the manducatory organs are said to 

 come from the commissures of the collar. Nova Acta, 

 XX., p. 35, in Idothea and JEga, as also in the Scolo- 

 pendra. 



1st Ambulatory foot 



2nd 



Srd 



4th 



Supplies terminal segments, being itself distinguish- 

 able from the eighth ganglion by a foramen placed 

 mesially. This ganglion represents the free terminal 

 ganglia described by Kathko and Milne-Edwards 

 in the fnarino species Idothea Entomon, ^ga Bicar- 

 inata and Cymothoo, and by LerebouUet in the air- 

 breathing and closely allied Ligidium Persoonii. 

 See Nova Acta, xx., Pt. i. p. 34 ; Hist. Crustac^s, Taf. 

 xi. 2 ; Ann. Sci. Nat. xx. PI. v. 24. 



Orthopterous Insect. Periplaneta Onentalis. 

 See Plate vi. 



Post-oral ganglion supplies mandibles and bifid labium; 

 is closer to supra-oesophageal mass than in Cnis- 

 tacea. 



1st pair of feet 



2nd 



Srd 



This ganglion is probably to be considered as having 

 become fused with No. iv. 



1st abdominal ganglion 



2nd 

 . Srd 



4th 



5th abdominal ganglion, corresponding aa the tenth 

 post-oral of the LarvKj of Lopidoptera and tenth post- 

 oral of the embryo Scorpion do with the first post- 

 abdominal of the Crustaceans. 



eth, bilobed terminal ganglion, corresponding to the 

 three terminal ganglia of Gammarus Pulex. 



(Tdbli- 111 tmiic 111.) 



