EXPLANATION OF PLATE VL 



Fig. 1. — Dissection in the middle region of Pheretima hawayana ; b. w., 

 body-wall ; c, spore cysts of Monocystis ; d. v., dorsal 

 vessel ; int., intestine ; l.g., lymph gland. 

 „ 2. — Dissection in the posterior region of Pheretima heterochaeta ; 

 letters as before. 



,, 3. — Horizontal longitudinal section through a lymph gland of 

 Plierefiyna fosthuma, showing relations to the septum and 

 dorsal vessel ; only a fe'w cells are shown in the interior 

 of the gland, and the reticulum and branching muscular 

 fibres are omitted ; a, a leucocyte ; ac, one of the peri- 

 pheral lobules of the gland ; d.v., the dorsal vessel ; m, 

 encapsuling membrane of the gland ; feri., peritoneum ; 

 sejp., septum ; v, valve in dorsal vessel. 



., 4. — Vertical longitudinal section passing through the lower end 

 of Beddard and Fedarb's organ ; c, leucocyte ; cm., 

 circular muscular layer ; cp., coelomic organ ; cu., cuticle ; 

 e'p., epithelium ; l.m., longitudinal muscular layer ; neph., 

 nephridium ; peri., peritoneum. The epithelium is shown 

 as a thick black line only. 



Figs. .3 and 4 are semidiagrammatic. 



