96 NOTES ON AVIAN ENTOZOA—LINTON. 
almost to the walls of the body, being separated from them by a thin 
layer of the vitellaria, and some strong muscle-fascicles from the anterior 
division of the body. The cells of the ovary measure 0.02 millimeter 
in diameter. The nuclei measure 0.007 millimeter in diameter, and in- 
some a nucleolus was observed. Between the ovary and the anterior 
testis is a space which contains what I have called in the explanation: 
of Fig. 28, the anterior seminal receptacle, the vagina and the begin- 
ning of the oviduct. The sections showed the presence of a duct here 
which appears to communicate with the exterior dorsally and which I 
have interpreted as the vagina, or canal of Laurer. (Fig. 28 v.) The 
oviduct originates at the dorsal end of the ovary, passes along the dorsal 
region between the anterior testis and the body-wall, enters the space be- 
tween the testes where, after receiving the main vitelline duct, it enters 
the shell-gland and emerges in the ventral region as the uterus. The 
uterus, from its origin about the ventral side of the anterior testis, pro- 
ceeds anteriorly where, in the space in front of the ovary the ovules are for 
the most part collected. The uterus here appears to consist of several 
voluminous folds, but the walls are thin and the ova appear in the section 
to lie in an illy-defined cavity. The posterior prolongation of the uterus 
was proved by tracing ova along the ventral region, where they were 
found in the posterior portion of the uterus near where it terminates in 
the posterior bursa. The walls of the uterus near its posterior end are 
thick and muscular and lined with cilia. 
The vitelline glands are voluminous organs, occupying the anterior 
part of the body proper, where they fill the peripheral regions, having 
a further development in the anterior division of the body. A broad 
ventral branch extends backward almost to the posterior end. Two 
vitelline ducts extend along the ventral side of the body above the ven- 
tral vitellaria. Opposite the space between the two testicular lobes 
each gives off a duct which unite in a common duct between the two 
testes. This latter duct joins the oviduct behind the shell-gland. (Fig. 
28 yd.) A cross section of the common vitelline duct presents a curious 
reticulated appearance, due to aggregation of the food yolk into elon- 
gated spheroidal masses of minute fat globules. 
Distomum (?) verrucosum sp. nov. 
(Pl. vi, Figs. 33-35.) 
Two singular specimens from the intestines of the California Gull 
(Larus californicus) possess so many characters peculiar to themselves 
that I do not hesitate to regard them as representatives of a hitherto 
undescribed species, although on account of the paucity of material I 
am able to give but few points in their anatomy. 
One of these specimens was coiled in a spiral as shown in Fig. 33, 
the other, Fig. 35, had lost a part of the body. That the two belong to 
the same species admits of no doubt. 
The length of the fragment was 5,5 and of the entire specimen about 
8 millimeters. 
