NEW WORMS 
223 
is a much smaller worm with longer spicules. The relation of the left spicule to the length of 
the entire worm, for instance, varies from 1/11.7 to 1 / 1 3 . 3 as against 1/29.4 to 1/30.6 in the 
species described above. Other points of difference include length of vagina, size of egg and 
numbers of caudal papillae in the male. P. anabanti Pears'e, 1933 is a much smaller worm 
with simple lips and a smooth cuticle. P. problematicus Kreis, 1940 and P. trygonorrhinae 
Johnson and Mawson, 1943 differ in the length of spicules and oesophagus, in the position of 
the vulva and in the number and arrangement of the caudal papillae in the male. P. sordidus 
Lent and Freita, 1948 may be distinguished by the posterior position of the vulva and the 
attenuated tail in the female and the size of the spicules and the number and position of the 
caudal papillae in the male. 
Family: 
Sub-family : 
Genus : 
Species : 
Host: 
Location : 
Physalopteridae Leiper, 1908. 
Physalopterinae Bailliet, 1893. 
Proleptus Dujardin, 1845. 
P. malayi n. sp. 
Scy Ilium sp. 
Small intestine. 
Locality: Sea-coast, Malaya. 
References 
Baylis, H. A. (1933). On the nematode genus Proleptus. Ann. Mag. Nat. Hist ., Ser. 10, 12, 325-335. 
Johnston, T. H. and Mawson, P. M. (1943). Some nematodes from Australian elasmobranchs. Trans. 
Roy. Soc. S. Aust., 67 (2), 187-190. 
Kreis, H. A. (1940). Beitrage zur Kenntnis parasitischer Nematoden, IX Parasitische Nematoden aus 
dem Naturhistorischen Museum Basel. Zbl. Bakt., Abt. Orig., 145, 163-208. 
Lent, H. and Freitas, J. F. T. (1948). Uma colecas de Nematodeos parasitos de vertebrados, do Musen 
de Historia Natural de Montevideo. Mem. Inst. Oszv. Cruz., 46, 1-72. 
Muller, J. F. (1925). Some new features of Nematode Morphology in Proleptus obtusus Dujardin. J. 
Parasit. 12, 84-90. 
Pearse, A. S. (1933). Parasites of Siamese fishes and crustaceans. J. Siam. Soc. Nat. Hist. Supp., 9, 
I79-I9I- 
Africana singaporensis n. sp. from a toad. 
These worms were obtained from the large intestine of the toad, Bufo melanostictus , 
collected in Singapore. 
Description (Fig. 10) 
The Male: The male measures 5.2 to 5.7 mm in length and its maximum width which is at about 
the middle of the body is 0.28 mm. There are three well-developed lips with the apices of their free 
margins prolonged into anteriorly directed cuticular processes. Each of the lips bears two submedial 
rounded papillae. The diameter of the head at the base of the lips is 0.05 to 0.06 mm. Cervical papillae 
are absent and the lateral cuticular flanges are feebly developed. The oesophagus, including the pharynx 
and bulb, measures 0.88 to 0.9 mm in length. The pharynx is 0.063 mm long and 0.026 mm broad. The 
oesophageal bulb is 0.17 mm long and 0.15 mm broad. The excretory pore is 0.49 mm from the anterior 
end and communicates with a large excretory vesicle. The nerve ring is 0.26 mm from the anterior end. 
The preanal sucker is somewhat oval, being 0.05 mm long and 0.04 mm wide. The tail, which is 
conical, is curved ventrally and is 0.26 mm long. The caudal alae are membranous and extend from a 
point about 0.4 to 0.5 mm from the tip of the tail to a short distance beyond the level of the cloacal opening. 
At the widest point, the caudal alae stretch on either side of the body for about 0.04 to 0.08 mm. In most 
specimens the caudal alae merge into the lateral wall of the body and even in those in which their outline 
extends ventrally, the alae do not meet in the midline. 
Twenty-two pairs of caudal papillae are present, of which three are pre-suctorial in position, three 
para-suctorial, five between the sucker and the cloacal opening and the rest post-anal. Of the presuctorial 
group of papillae, the two anterior ones are sub-ventral and the posterior one slightly more lateral in 
MALAYA , No. 26, 1953 
