500 



ARACHlsIDA. 



dorsal surface of the cephalic region behind the frontal margin. 

 Their arrangement is very regular, and is characteristic for the 

 different genera (figs. 398 and 399). 







00 



o o 



o 



o 



st 



st 



Firs. 397. Mygale from the ventral 

 side, part of the skin is turned aside 

 (regue animal). E, Chelicera ; Bg, 

 thoracic ganglionic mass; P, P' , 



00 



oooo 





 C 



O 



o o 

 000 



d 



FIG. 399. Arrange- FIG. 400. Alimentary canal 

 ment of the eyes in of Mi/gale fregne animal). 

 G, Cerebral ganglion; Ma, 

 cliverticula of stomach ; 

 L, hepatic ducts ; N, Mal- 

 pighian vessels ; N, rec- 

 tum. 



different spiders 

 (after Lebert). a, 

 Eprira ; //, Tegfimrin ; 

 c, Doloiitriln ; <1, Sal- 

 ticns. 



The alimentary canal (tig. 400) 

 lungs; F, lamella? of the lungs; b e m ns beneath the upper lip with an 



St, Sf, stigmata; Oc, ovary; Sir, , 



spinning papilla?. ascending pliaryngeal portion ot 



oesophagus, into which a saccular pha- 

 ryngeal gland opens (salivary gland). 

 The narrow oesophagus, before passing 

 into the midgut or intestine, is dilated 

 to form a suctorial stomach, which is 

 furnished with powerful muscles arising 

 from the dorsal part of the cephalo- 

 thorax. The midgut is divided into 

 FIG. 398. Anterior part of the cepha- an anterior part, lying within the 



of Mygale with the eyes (O) cep halo thoracic region and provided 



(regne animal). 



with two anterior and lour lateral pairs 



of cfeca, and into a narrower abdominal small intestine, into which the 

 ducts of the branched hepatic tubes pour their secretion. The latter 



