PLATE, Sr 
Exhlanation of Figures. 
Fic. 1. Branchiura sowerbyt ; oblique section through poster- 
ior portion of segment xi; X 120. 
Fic. 2. Branchiura sowerbyt ; section through middle portion 
of atrium with paratrium; X 4IOo. 
Fic. 3. Branchiura sowerbyi; sectionthrough upper portion | 
of coelomic sac, showing junction of paratrium and middle region 
of atrium with distal portion of atrium; X 330. 
Fic. 4. Branchiura sowerbyi ; section through proximal 
region of atrium and paratrium outside coelomic sac; X 240. 
Fic. 5. Branchiura sowerbyi ; vertical section through coelo- 
mic sac and distal region of atrium; X 95. 
The above five figures drawn by Abbe’s drawing apparatus 
from a series of longitudinal sections through the anterior end of a 
single specimen; the sections pass pretty accurately through the 
distal portion of the atrium on one side (fig. 5), but obliquely on 
the other (fig. I). 
B.v., blood-vessel; c. sac., wall of coelomic sac; d. at., distal 
portion of atrium; d. w., dorsal body-wall ; m. at., middle portion 
of atrium ; o. f., ovarian funnel ; par., paratrium ; #. at., proximal 
portion of atrium ; fer., peritoneal cells round proximal portion of 
atrium, corresponding to the glandular cells of other observers ; 
sp., septum I1/I2; s. s., sperm sac; v. def., vas deferens ; v. w., 
ventral body-wall; x, at upper end of distal portion of atrium, 
indicates the place where, in a neighbouring section, the para- 
trium and middle portion of atrium enter ; o@ male aperture. 
Fic. 6. Enchytraeus indicus; segments xi and xii, from a 
specimen mounted whole in cedar oil. 
Clit., clitellum; f., seminal funnel; ov., ova; pen., penial 
body 5s. seta, testis: 
