H. Gr. Jackson 
55 
given by Leiper (0*150 mm. by 0*070 mm.) must be taken as a minimum. 
Extracted from the uterus and measured in 70 per cent, alcohol the eggs lie 
between 0*150 mm. to 0*190 mm. in length and 0*070 mm. to 0*110 mm. in 
breadth. Measured from balsam preparations the eggs are on the average 
smaller (through shrinkage) than those extracted and measured in the medium 
in which the flukes are preserved. 
SUMMARY. 
1. The specimens in the material here dealt with make a series of forms 
connecting F. august a (Railliet) and F. aegyptiaca (Looss). 
2. No important character separates any of these flukes from F. gigantica 
(Cobbold) and they must accordingly be all identified with this species. 
3. The following key represents the simplest method of distinguishing 
between the species of Fasciola at present described. (For detailed diagnoses 
see the literature referred to below and this paper.) 
| Yolk glands ventral to gut . 
( Yolk glands on both sides of gut. 
2 . 
3. 
Body very large and thick; cone not very distinct; oesophagus 
one and a half to three times as long as pharynx . F. magna. 
- 
Body slender and awl shaped; cone very large and distinct; 
k oesophagus exceedingly short. F. nyanzi. 
' Body at least three times as long as broad; “shoulders’’ absent 
or indistinct; internal branches of gut numerous and branched 
F. gigantica. 
Body broad and leaf shaped; cone sharply set off from body on 
wide ‘‘shoulders”; internal branches of gut few and little if at all 
.branched. F. hepatica. 
LITERATURE. 
Stiles, C. W. (1894-1895). The anatomy of the Large American Fluke. Journ. Comp. Med. 
and Vet. Arch. xvi. 139. 
Railliet, M. A. (1895). Sur une forme particuliere do Douve hepatique provenant du 
Senegal. Comp. rend, des seances de la Soc. de Biol., Mai. 
Looss, A. (1896). Recherches sur la Faune parasitaire dc l’Egypte. B' re Partie. Mem. 
de rinstitut Egyptien, in. 1-252. PI. I-XVII. 
Blanchard, R. (1896). Parasites Animaux, in Bouchard, Traite de Pathologie generate, n. 
733-734. 
Stiles, C. W. (1898). Flukes and Tapeworms of Cattle etc. with special reference to the in¬ 
spection of meats. Bureau of Animal Industry, Washington. 
Looss, A. (1902). Uber neue bekannte Trematoden aus Seeschildkroten. Zool. Jahrb., Jena. 
Abt. f. Syst. v. 16 (3-6), 24 Nov., 781-783. 
Braun, Max (1906). Animal parasites of Man. 
Leiper, R. T. (1910). The Entozoa of the Hippopotamus. Proc. Zool. Soc., Feb. 1st, 237-238. 
Goddard, F. W. (1919). Fasciolopsis buski. Journ. of Parasitology, v, no. 4, June, 
141-163. 
