EXPLANATION OF PLATE XXXIII. 
. 28.—Pheretima trivandrana;, spermatheca. 
29.—The same; spermatheca viewed under the low power 
after clearing, to show the chambers in the diverti- 
culum. 
30.—Pheretima kuchingensis; spermatheca. a, the whole 
organ, showing the micronephridia covering the duct ; 
b, diverticulum of another organ, showing a small 
secondary diverticulum. 
31.—Octochaetus surensis; spermatheca. 
32.—Octochaetus barkudensts ; penial seta. 
33.—The same; copulatory seta. 
34.—Eutyphoeus annandalei var. fulgidus; penial seta. 
35.—Dichogaster malayana; spermatheca seen by tratispa- 
rency after clearing. 
36.—The same; penial setae. a, b, the two types numbered 
I and 3 in the text; c (2 in text) resembles a except 
that the thin expansion is one-sided only. 
37. Glyphidrilus tuberosus ; segments xviii to xxviii from 
the ventral surface, showing the papillae in this re- 
gion, with the ventro-lateral ridge on one side and 
the cauliflower-like excrescence on the other. 
