216 
South African Cercariae 
recognisable in the larva. There are other characters, however, which are 
phylogenetically constant. These may be depended on in demonstrating the 
correlation. 
It is not within the province of this paper to detail these fundamental 
homologous characters. However, the writer does desire to urge that these 
morphological characters be used hand in hand with the experimental work 
in investigating life histories, for neither one nor the other may be used alone 
without the danger of misinterpretation. 
Table giving important biological data on South African Cercariae. 
Described 
Group 
Species 
by 
Date Host 
Locality 
Amphistome 
C. frondosa 
Cawston 
1918 Isidora schakoi 
Potchefstroom 
Isidora schakoi 
Stellenbosch 
Monostome 
Distome 
C. fulvoculata 
Cawston 
1919 Lymnaea natalensis 
Durban 
fEchinostome 
'C. catencita 
Cawston 
1917 Lymnaea natalensis 
Magaliesburg 
Lymnaea natalensis 
Durban 
Planorbis pfefferi 
Durban 
' 
Physopsis africana 
Durban 
J 
X 
C. arcuata 
Cawston 
1918 Isidora schakoi 
Klerksdorp 
Lymnaea natalensis 
Durban 
C. constricta 
F aust 
1919 Physopsis africana 
Durban 
1 
0. coma 
Gilchrist 
1918 Isidora tropica 
Muizenburg Lake 
C. 30-acanthostoma 
Faust 
1920 Physop>sis africana 
Lyndenham 
Xiphidio-cercariae 
C. cawstoni 
Faust 
1919 Physopsis africana 
Maritzburg 
Lymnaea natalensis 
Maritzburg 
■ 
Planorbis pfefferi 
Durban 
Leptocercariae 
C. pigmentosa 
Cawston 
1919 Lymnaea natalensis 
Natal 
l^Furcocercariac 
(C. of Schistosoma 
Cawston 
1915 Physopsis africana 
Rustenburg 
haematobium 
' 
Maritzburg 
Magaliesburg 
Mulder’s Drift 
Nijlstroom 
Durban 
Ottawa 
Lyndenham 
C. of Schistosoma. 
Faust 
1920 Physopsis africana 
Durban 
mansoni 
Ottawa 
Lyndenham 
C. gladii 
Cawston 
1918 Isidora schakoi 
Potchefstroom 
C. secobii sp. inq. 
Cawston 
1915 Physopsis africana 
Maritzburg 
. .. ■' ", •„ 1 
C. oculata 
Cawston 
1917 Physops-is africana 
Durban 
• 
C. parvoculata 
Cawston 
1919 Physopsis africana 
Durban 
C. bilharziellalunata 
synonym 
of C: oculata 
C. spinosa 
{C. crispa 
synonyms of cercariae of human schistosome species 
