500 AEACHNIDA. 



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). 



K 







00 



o 



Sus 



FIG. 3<dT.Mygale from the ventral 

 side, part of the skin is turned aside 



00 



oooo 

 c 



O 



O o 



GOO 

 d 



FIG. 399. Arrange- 

 ment of the eyes in 

 different spiders 

 (after Lebert). a, 

 Epeira ; b, Tegenaria ; 

 c, Dolomedes ; d, Sal- 

 ticus. 



Fio. 400. Alimentary canal 

 of My gale fregne animal). 

 G, Cerebral ganglion; Ms, 

 diverticula of stomach ; 

 L, hepatic ducts ; N, Mal- 

 pighian vessels; E, rec- 

 tum. 



alimentary canal (fig. 400) 

 lungs; F, lamella of the lungs; begins beneath the upper lip with an 



St, St', stigmata ; Ov, ovary ; Sw, . 



spinning papiiite. ascending pharyngeal portion or the 



oesophagus, into which a saccular pha- 

 ryngeal gland opens (salivary gland). 

 The naiTOw 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 

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

 with two anterior and four lateral pairs 

 of ca3ca, and into a narrower abdominal small intestine, into which the 

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



(regne animal). 



