34 CALIFORNIA ACADEMY OF SCIENCES. 
Deliania Benhami. Tn the genital region, the distance between the two inner sete 
diminishes toward the male pore, almost in the same way as in De/tania elegans, with, 
however, a slight but characteristic difference. The inner or first seta in xyili is 
often, but not always, wanting, probably falling out when young, before its full devel- 
opment, as more frequently a rudimentary seta is seen in place of a fully developed 
one. 
The first and second sete in xix and xx are closer together than normally. but 
already in xxi the sete have regained their proper distance. Again, anterior to the 
male pore, the setee 1 and 2 in xi to xvi are closer than normally, those in xiv to xvi 
are equidistant, while those in x to xiv rapidly approach. If we thus compare with 
Deltania elegans, we find that the arrangement relatively in front and behind the 
male pore is reversed. While in De/tania elegans, the anterior setee quickly con- 
verge, the posterior ones approach slowly. In Deltania Troyeri, the opposite is the 
case. 
The shape of the sete in the two species is very similar. Compared again 
with the arrangement of the sete in Deltania Benhami, we find that in the present 
species the sete in the ventral couples, as well as those couples themselves, are 
much further apart than in Deltania Benhami. The deltoid arrangement, also, is 
different in the two species, of which the figures give a better idea than any lengthy 
description (figs. 24, 39, 40). 
The sacs of penial setw (fig. 33) are found as usual in the vicinity of the male 
pore in xvii. There are seldom more than one seta in each sae. This seta is long, 
slender, almost straight, occupying the whole length of the sac. Now and then there 
is a rudimentary seta in the same sac, but never more than one developed seta. In 
Deltania elegans there are three or four set in each sae. 
Alimentary canal (figs. 26 and 27). The buceal cavity extends superiorly to 
ii, inferiorly to y. The pharynx ends in y, and is much less developed than in 
Deltania elegans. The upper fold is, however, very large. There are one pair of 
long and narrow salivary glands in each of iii and iy, and one pair very large com- 
pact ones in iy. The cesophagus commences in y, and rises to a sigmoid plexus in 
viii. It is greatly contracted at the septa. In xy and xvi it narrows down to a tubu- 
lar intestine. 
The sacculated intestine commences in xvii, but attains its full width first in 
xix or xx. There is no gizzard, no ealciferous glands nor pouches of any kind at- 
tached to the alimentary canal. 
Nervous System (fig. 28). The characteristic feature of the nervous system is 
the eyen width of the ventral ganglion, the two sides being nearly parallel throughout, 
with almost imperceptible contractions at the septa. In Deltania elegans this contrac- 
tion is very prominent, and the ganglion is almost twice as wide in the posterior part 
of the segment as in the anterior one. This characteristic appears constant. In 
Deltania Benhami the ganglion is narrowed somewhat at the septa, but the posterior 
part in each segment is not any wider than the anterior part. 
