102 



ARACHNIDA. 



the deutovum stage, a funnel-shaped structure joins each of these 

 thickenings externally, being attached at its narrowed end to the 

 cuticular deutovum. An aperture is found here (Fig. 52, st), and 

 this, together with the crescent-shaped structure at the surface of 



Fig. :,4. — Larva of Gamasus fucorum (after Winkler, from Lang's Text-book). 1, chelicerae; 

 2, pedipalps ; 3-5, ambulatory limbs ; etc, aorta cephalica ; g, brain ; h, heart ; Is, hepatic 

 caeca ; to, muscles (retractors of the chelicerae) ; md, lnetenteron ; r, rectal vesicle ; vm, Mal- 

 pighian vessels. 



