Southern — Monograph of the British and Irish Oligochceta. 179 



Plate VTII. 



FIG. 



5. Limnodrilus parvus n. sp. : 



A. Setse : 



a. seta from third dorsal bundle ; 



b. seta from fifth ventral bundle. 



B. Brain. 



c. Spermatheca. 



D. Male efferent apparatus : 



a. atrium filled with spongy masses of cells ; 



b. chitinous penis-sheath. 



E., a-d. Various forms of the distal end of the penis-sheath. 



6. Tubifex Tenfipletoni n. sp. : 



A. Setse : 



a. from anterior dorsal bundles, showing accessory teeth ; 



b. from the thirteenth ventral bundle. 



B. Brain. 



c. Part of ventral nerve-cord, showing wing-like expansions. 



D. Spermatheca. 



E. Male efferent apparatus : 



a. ciliated proximal portion of the atrium ; 



b. chitinous penis-sheath. 



F. Penis-sheath. 



