140 On new Aquatic Annelids. 
on segment 21. There is no muscular gizzard, nor are 
cesophageal glands, prostate glands, or ecelomic glands to be 
found. There is also an absence of dorsal pores and _head- 
pore. This is characteristic of aquatic forms. Spermathecz 
have not been found and appear to be wanting. ‘The sete, 
which are in four pairs, are not ornamented. Tubercular or 
pubertatis band present on certain girdle-segments. 
This generic description may be supplemented by some 
notes on the species. A. fontinalis differs from the other 
members of the family so far described in the matter of 
length. Nearly all the known Criodriline are long and 
slender, but this worm closely resembles our native Adlurus 
(Hiseniella), The male pore is within a very conspicuous 
papilla, which extends (as in Dendrobena mammalis, Sav.) 
over the adjoining segments 14-16, The absence of a gizzard, 
however, shows it to be a true water-worm, and the internal 
anatomy agrees in general with that of the Criodriline. The 
Anagaster fontinalis. Slightly enlarged. 
girdle is saddle-shaped, the ventral surface of the girdle- 
segments being quite unaffected. ‘The anterior portion of the 
girdle is not very clearly defined. It affects segment 21 and 
extends back to segment 32 or 38. The tubercular band is 
on segments 29-31. Ventrally segments 11-14 and 29-31 
are more tumid than the others. ‘The living worm is red or 
flesh-coloured, and the abundant blood-vessels are to be seen 
through the delicate epidermis. The anus is terminal. 
The internal details were not easy to determine, owing to 
the specimens having passed maturity. ‘The development of 
the girdle is remarkable on the dorsal surface. The principal 
heart is in segment 10, while a somewhat less pronounced 
dilatation is found in the fitteenth segment. The typhlosole 
is seen in each segment to act as a valve. The pharynx 
extends to the anterior third of segment 5, and shows a struc- 
ture which suggests rudimentary salivary glands, In seg- 
ments 9, 11, 12 are also some organs which, by their glairy 
