;9S 



ARTIIROrODA 



TarJigraJd. 



These are minute fresh-water forms, known to microscopists as 'water bears' 

 (tis;. 4? 0. wliieh owe their name to their slow motions. Tliey haw" four pairs of 

 short, hooked legs, their sole Araehnidan character. The genital ducts empty 



Fig. 



Fig. 43;. Fig. 433, 



432. — Lan-a of Pcniastomum probosciJcuii: (after Stiles). 1/, stomach; c, gland 



cells; III. mouth; .'.7, stylet; _v, posterior larval hoeiks; i, J, leg 



Fig, 433. — Macrahiotus hiifcljiidi, water bear (after drawings liyGreef and Plate"). 

 I-!]', legs; d. accessorv glands; m, stomach: iiik. mouth capsule; ai\ ovary; 5/>, salivary 

 glands; si. stylets; viii, excretory tubules; blood cells in the body. 



Fig. 



434, — Xymplioi! slrirmii* (orig."), c, chelicera-; 



r rostrum. 



iwigerous legs; />, pedi]ialpi; 



into the rectum; the nervous system has four ventral ganglia; heart and respira- 

 tory organs are lacking. In de\elopmcnt they are remarkable for the large 

 coclomic jiouches. In the feet are glands recalling ncphridia in their history. 

 It is possible that these animals are to be placed among the Ca-lhelminthes. 



Macrobiolns.* 



