CAMPYLAEA COERULANS. 
41 
Fig. 2. Reproductive system of H. coerulans. 
fm = albumen gland, hm — hermaphrodite gland, /iv = hermaphrodite duct, 
pv == oviduct, ov = prostate, fc/ = vas deferens, nj/rn = mucus glands, _p — penis, 
o = flagellum, vi — penis retractor muscle, ot — spermatheca, f — diverticu¬ 
lum, iny == generative orifice, f = sacklike appendix of the spermatheca duct, 
w/ = dart. 
the end forklike ramified mucus glands. C. coerulans has also two very 
strongly developed, not ramified, cylindrical mucus glands, the ends of 
which are curled. These are at least as long as the oviduct, though 
frequently longer. The dart sack is to be found between the two mucus 
glands and opens into the vagina under the place of union of the 
ovisperm duct and of the spermatheca duct. The dart is spearheaded 
and thickened in the whole length of its middle part, thinned at the 
edges, i. e. double-bladed. All the Campylaeae have such double- 
bladed darts. 
same type as the Campylaeae. The chief characteristics of the genitalia 
of the Campylaeae, as is well known, is seen from the spermatheca, 
the mucus glands, and the dart. Fig. 2. shows the whole reproductive 
system of C. coerulans, but here I only discuss those parts which have 
a systematical importance. 
The most peculiar and permanent characteristic of the reproductive 
system of the Campylaeae is that it possesses either two simple or at 
