Eintozoa from Birds in Uganda. 459 
a thin, rough shell. They measure 112 x 70 w-125 x 75 wu. 
They do not contain a formed embryo at the time of laying, 
Note.—The presence of an intestinal diverticulum, according 
to the view of some authors, necessitates the formation of a 
distinct family, or, at least, subfamily, for the three-lipped 
nematodes possessing it [see Railliet and Henry, 1912, 1915 *]. 
The genera comprised in this “ family,” however, do not 
seem to have been very clearly defined up to the present. 
The species under discussion is therefore named only pro- 
visionally Ascaris, sens. lat. 
2. Subulura plotina, sp. n. 
Host: Plotus rufus. (Darter.) 
The male (of which there is only one example) measures 
8:2 mm. in length and 0°34 mm. in maximum thickness. 
Tlie female (largest of four specimens) is 14:2 mm. long and 
0°46 mm. thick. The worms are of slender build, tapering 
gradually at either end, In both sexes the neck bears a pair 
of lanceolate cuticular ale at the sides, extending from the 
anterior end to about the beginning of the cesophageal bulb. 
The opening of the mouth is apparently hexagonal in outline. 
There is a small mouth-capsule with three very small teeth 
at the entrance to the cesophagus, as is usual in this genus. 
There are no lips, but the mouth is surrounded by six (?) 
very small papillae. The excretory pore is situated at 
0°45 mm. from the anterior end in the male and at 0°55 mm. 
in the female. 
The cesophagus has an oval posterior bulb, which is 
distinctly marked off from the anterior portion, and has its 
hinder end pushed in, as it were, into the beginning of the 
intestine. The length of the cesophagus (including the bulb) 
is 1°25 mm. in the male and 1°5 mm. in the female. 
In the male the tail (fig. 2) measures only 0-2 mm. in 
length, and has no alee. Tue preanal sucker, which is elon- 
gated in shape and has no chitinous border, is situated at 
about 0°4 mm. in front of the anus. The spicules (fig. 2, Sp.) 
are equal in length (about 0°9 mm.) and accompanied near 
the anus by an accessory piece (? two accessory pieces) 
(fig. 2, A.P.), the longest portion of which measures 0°15 mm, 
There are ten pairs of papilla—six postanal (fig. 2, 7-6), one 
paranal (fig. 2, 7), and three preanal (fig. 2, J-Z/1). Of 
these the third postanal (counted from the tail-tip) and the 
paranal are more laterally situated than the rest. The most 
* Bull, Soc. Path. exot. v. no, 4, 1912, p. 256, and viii, no, 5, 1915, 
p. 270. 
