ARTHROPODA 



[CH. 



Fia. 71. 



Astacusfluviatilis, viewed from beneath, 

 have been removed. 



The appendages on one side 



Anus. ap.arth. Arthrodial apodeme. ap.par. Paraphragmal apodeme. 

 b.ch. Branchial chamber. e. Epistome. g.a. Female genital aperture. 

 g.g. Opening of the green gland, i.s. Intersternal membrane. Ib. Labrum. 

 md. Mandible. mt. Metastoma. mx.l. First maxilla. mxp.I. The 

 first maxillipede. rs. Rostrum. s.14, s.20. The fourteenth and 



twentieth sterna respectively. t. Telson. Arabic figures denote the 

 segments, Roman figures the appendages. 



