Entozoa from Birds in Uganda. 459 



a thin, rougli shell. They measiire 112 x 70 /x-125 x 7o /ix. 

 Tliey do not contain a toimoil euiljiyo at tht; time of layiiii^. 

 Note. — Thu i)rc'.Hciice()f'ati iiitf;.stiiial «liverticuliiiii, accorilini^ 

 to the view of some authors, nect^snitatas the foniiatioii of a 

 distinct fanuly, or, at least, subfamily, for the three-li[)p<;(l 

 nematodes possessing; it [see ilailliet and Henry, 1912, 1915*]. 

 The genera comprised in this '* family/' however, do not 

 seem to have heen very clearly detined up to the present. 

 Tlio s|)t'<i(vs nmler discussion is therefore named ouly pro- 

 visionally Ascaris, sens. lat. 



2. Subnluru plotina, sp. n. 



Host : Plains rufus. (Darter.) 



The male (of which tliere is only one example) measures 

 8"2 mm. in length and U'31: mm. in maximum thickness. 

 The female (largest of four specimens) is 14*2 mm. long and 

 0'46 mm. thick. The worms are of slender hiiild, tapering 

 gradually at either end. In both sexes the neck bears a pair 

 of lanceolate cuticular alje at the sides, extending from tho 

 anterior end to about the beginning of the oesophageal 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 oesophagus, as is usual in this genus. 

 Tiiere are no li|)3, but the mouth is surrounded by six (?) 

 very small papillaj. 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 oesophagus 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 oesophagus (including the bulb) 

 is 1'25 mm. in the male and 1*5 mm. in the female. 



In the ny,\\Q the tail (tig. 2) measures only 0"2 mm. in 

 length, and has no ala3. Tne preanal sucker, which is elon- 

 gated in shape and has no chitinous border, is situated at 

 about U'4 mm. in front ot the anus. Tlie spicules (lig. 2, *S//.) 

 are equal in length (about 0*9 mm.) and accompanied near 

 the anus by an accessory piece (? two accessory pieces) 

 (fig. 2, -^.P.), the longest portion of which measures 0' 15 mm. 

 There are ten pairs of papillae — six postanal (fig. 2, /-6), one 

 j)aranal (fig. 2, 7), and three preanal (fig. 2, /-///). Of 

 these the third postanal (counted from the tail-tip) and the 

 paranal are more laterally situated than the rest. The most 



• Bull. Soc. Tath. eiot. v. no. 4, lUll?, p. 256, and viii. no. 5, 1916, 

 p. 270. 



