39. Subulura plotina Baylis, 1919. 
Dimensions: 
S Length: 8,2; width: 0,34 mm. 
Q Length: 14,2; width: 0,45 mm. 
Body cylindroid, tapering at extremities. 
Cephalic expansions lanceolate in both 
sexes, going from cephalic extremity to be- 
ning of oesophagean bulb. Bulb hexagonal. 
Buccal capsule smail, containing three very 
small teeth at entrance of oesophagus. Oeso- 
phagus with oval bulb, with distinct anterior 
- part and posterior part fitting into first part 
of intestine. Mouth without lips, surrounded 
by six (?) small papillae. 
Male: Excretory pore 0,45 mm. from an- 
terior extremity. Oesophagus together with 
bulb, 1,25 mm. long. Tail without alae, 0,2 
mm, long. Sucker long without horny rim, 
0,4 mm. from anus. Spicules equal 0,9 mm. 
long, followed by accessory piece (two acces- 
sory pieces ?) oí which the largest part mea- 
sures 0,15 mm. Ten pairs of caudal papillae: 
six post-anal, one ad-anal and three pre- 
anal; of these, the third pre-anal (counting 
from caudal extremity) and the ad-anal are 
lateral. The foremost of the pre-anal near 
fhe sucker, a little in front of its middle 
part. 
Female: Excretory pore 0,65 mm. from 
head. Oesophagus 1,5 mm. long. Tail 0,8 
long mm. Vulva in the middle third of body 
5,8 mm. from head. Eggs 65X52.5 micra to 
75X55 micra. Uteri distended to beyond anus. 
Host: Plotus rufus (Darter). 
Origin: Uganda (Africa). 
GENUS OXYNEMA Linstow, 1399. 
Synonims. 
Heterakis pr. part. SONSINO 18889— p 
221. 
Oxynema LINSTOW 1699 —p. 19. 
Subulura (Oxynema) RAILLIET & HEN- 
RY 1913—p. 681. 
Subulura pr. parte. TRAVASSOS 1913 — 
p- 19. 
Oxynema TRAVASSOS 1914—p. 138 & 
139. 
Allodapa pr. parte. SEURAT, 1915—p. 
126. 
44 
Subulura pr. parte. 
52, 54 and 60. 
Oxynema BARRETO 1917 b. p. 305. 
HALL, 1916-p. 
Historical Notes. 
Oxynema was the name given by LINS- 
TOW in 1899 toa new genus of worms, 
the type species of which was represented 
by a nematode from the Museum of Berlin: 
Oxynema rectum n. so. collected by HEM- 
PRICH and EHRENBERG in two Egyptian 
canine animals: Vulpes (Megalotes) zerda 
Zimm. and Vulpes (V) vulpes var. aegpptiaca 
(Desm). Placing this new genus inthe group 
of meromyarians of SCHNEIDER, LINSTOW 
supposes them to be related to the Oxyuri- 
dae. 
Comparing the characteristics attributed 
to Oxynema rectum with the description of 
Heterakis crassispiculum SONSINO (1889), 
RAILLIET & HENRY (1913) observed a great 
likeness between the two worms which differ 
only slightly in size, in the number of papil- 
lae and in the number of their eggs. 
These authors point out that LINSTOW 
considered his Oxynema as a meromyarian 
type on acount of the external aspect of the 
musculature and did not seem to have stu- 
died the arrangement of the muscular ele- 
ments in transversal cuts. 
kAILLIET € HENRY speak of Hetera- 
kis boueti, found by GENDRE in the intesti- 
ne of an African squirrel (Xerus) erytropus 
Geoff.), which presentis the greatest affinily 
with the parasites of the canine animals 
(Presence of right spiculum followed by gu- 
bernaculum) and is consequently doubtles- 
sly allied to them. 
Taking the great number of characteris- 
tics, common to the genera Oxynema and 
Subulura, into consideration, RAILLIET & 
HENRY propose that the first be consi- 
dered as a simple subgenus of the latter, 
that is as a Subulura which had almost or 
completely, lost one of its spicules. 
TRAVASSOS (1914) is of a different 
opinion, considering that Oxynema ought to 
be considered as a separate genus, sub-ordi- 
nate to the sub-family Subulurinae. 
