3GO 



EM ATHKLMIS TILES. 



Es 



layer of the integument lies a complicated system of canals, filled with 

 a clear fluid containing granules. Beneath the internal layer of the 

 integument, which layer is often very extensive and of a yellow 

 colour, is placed the powerful muscular tunic ; it is composed of 

 external transverse and internal longitudinal fibres, and bounds the 

 body cavity. Tiie complicated ramified system of dermal canals, of 



which two principal longitu- 

 dinal trunks may be recog- 

 nised, is filled with juices, 



and probably functions as a 



nutritive apparatus. The 



portion of this system which 



extends into two bodies (the 



lemnisci, fig. 289, Le) project- 

 ing behind the proboscis 



through the muscular tunic 



into the body cavity, probably 



acts as an excretory organ. 



since the contents of the fre- 

 quently anastomising canals 



of these lemnisci is usually 



of a brown colour, and consists 



of a cellular mass rich in 



concretions. According to 



Schneider, the vessels of the 



lemnisci open into a circular 



vessel in the integument, and 



only communicate with the 



network of canals in the 



cephalic region, while the 



other dermal vessels (nutritive 



apparatus), the contents of 

 Leuckart). w hi c h differs from that of the 



B 



FIG. 290. Male of Echi- 

 norhyncui 

 (after R. 

 K, proboscis ; Ss, 



sheath of the probes- vesselsot the lemnisci, are com- 

 cis ; Li, ligament; p i e te]y shut off from the latter. 



G, ganglion ; Le, lem- 



Generative organs. The 



organs. 



body cavity through which 

 fluids circulate encloses the 

 greatly developed genera live 

 organs, which are attached 

 to the end of the sheath of the proboscis by a ligament (figs. 290 



nisei ; T, testes ; Yd, 

 vasa deferentia; Pr, 

 prostatic sacs ; De, 

 cluctus ejaculatorius ; 

 P, penis ; B, retracted 

 bursa. 



FIG. 2<J1. Generative 

 ducts of a female 

 Echinorhynchut gigas 

 (after A. Andres). Li, 

 ligament ; F, d i s c- 

 shaped flocculi; F', F", 

 appendages of the 

 same ; U, uterus ; V, 

 vagina ; S, lateral 

 pouches of the bell ; 

 Gil, dorsal ce'.ls at the 

 base of the bell; Ol, 

 lateral cells. 



