
562 RECORDS OF THE S.A, MUSEUM 
Female Complex. The shape and structure of the female apparatus are 
indicated in fig. 29. There is a well developed uterine bell, up to 0-36 mm. in 
length; a thin uterus, 0-5 mm. long; and a single-bulbed vaginal sphincter 
0-15 mm. long. All our specimens are young, and though most of them contain 
swimming ovaries, none has ripe eggs. The youngest worms show that the 
ovarian balls arise near the base of the proboscis. The largest swimming ovary 
measured 0-19 X 0-12 mm., and the largest 934 334. The posterior end of 
many females is slightly invaginated, the vaginal sphincter connecting with the 
anterior end of the invagination. 
Systematic Position. We consider our specimens to be juveniles of Prosthor- 
hynchus charadrii Yamaguti (1934, 334). The size of the proboscis, the number 
and arrangement of its hooks, and the general organization resemble those of the 
Japanese species which was collected from Charadrius dubius curonicus Gmelin. 
There is, however, a slight difference regarding some of the hooks, In Yamaguti’s 
specimens all hooks except the posterior four in each row have rooting processes, 
whereas in ours all hooks except the posterior three in each row possess them. 
Yamaguti reported that the vaginal sphincter consisted of a double bulb, whereas 
in our material the structure is single-bulbed, but this condition may be due to 
immaturity. 
LITERATURE. 
Marval, L. (1905) : ‘‘ Monographie des Acanthocephales d’oiseaux.’’? Rev. Suisse 
Zool., xiii, 195-389. 
Meyer, A. (1932): Acanthocephala. In Bronn’s Klassen und Ordnungen des 
Tierreichs, Bd. iv, 2 Abt., 2 Buch. 
Perry, M. L. (1942) : ‘A new species of the Acanthocephalan genus, Filicollis.”’ 
Jour. Parasit., xxviii, 385-7. 
Travassos, L. (1926) : ‘‘Contribuicoes para o conhecimento da fauna helmintho- 
logiea brasileira.’? Mem. Inst. Osw. Cruz, xix (1), 31-125, 
Yamaguti, 8. (1939): “Studies of the Helminth Fauna of Japan, Part 29. 
Acanthocephala IT.’’?) Jap. Jour. Zool., viii (3), 3817-351, 
