01 
the living 1 specimen a well marked insetting current oi water is 
produced by the action of the cilia of tiu* intestinal epithelium. 
Like hero fureola, too (and differing’ from all the other species 
of the genus), it shows I he eophalisntiori restricted to the three seg- 
ments behind the peristomial ( Hig. 5). That is, there are present 
vent ral seta' only upon segments 2, d, and 4 ; dorsal seta) occur in 
the nth and following segments. 
My specimens differ, however, from Hero f areata as described by 
Hons field (18S(), p. 105), in a number of particulars. The number 
of segments most frequently found is 75, the worm having a length 
of about Id mm. (10 mm. in the preserved state). II is in worms 
of 1 hat length that what 1 take for incipient budding is to he looked 
for, the 2Sth segment occasionally showing indications of what ap- 
pears to he the formation of new small segments devoid of seta) ( Fig. 
2). Other than this, budding has not been observed, although many 
specimens with a smaller number of segments have been seen. In 
I hose latter, the branchial apparatus is usually less perfect and they 
are probably immature forms resulting from asexual reproduction. 
In its habits the worm, under laboratory conditions, resembles 
rather the free hero ( . I nlophora*) vafja of Leidy's descriptions. It 
moves rapidly through the water by an undulating movement, or it 
may crawl more slowly upon the side of the vessel by means ot its 
seta*. Numbers of them will lake up their abode within decaying* 
grass stems or in the interior of short lengths of straw, while 1 have 
seen them, not in frequently, as temporary tenants of the much, too 
large tubes of Ohironomus larva*. One specimen only has been found 
(within a short length of straw) in its proper tube, a delicate trans- 
parent structure to which many small mud particles were adherent. 
The structure and arrangement of the seta 1 depart hut little 
from that which seems to characterise the other species of hero . 
The seta) in the first ventral bundle (segment 2) are normally but 
three in number. In the succeeding’ segments there seem to he four 
invariably. Contrary, however, to what is stated by Housfleld of 
hero in general (op. ell., p. 98), the length of these setie does not 
considerably exceed that of the corresponding structures in the later 
segments. On the contrary they appear to increase slightly in 
length in successive segments until segment 8 is reached. All the 
ventral seta* appear to be of the hooked (acicnlar) type. 
Of the dorsal seta* there are hut two in each bundle. The single 
capillnte seta never reaches a length approaching that of the diam- 
eter of the body, while the short sigmoid seta accompanying it has 
relatively, a considerable length, projecting quite visibly well beyond 
the skin. 
Two or three segments at the posterior end of the body are 
devoid of dorsal seta bundles, hut the ventral seta) are missing 
from the Iasi segment only. 
