
582 RECORDS OF THE S.A. MUSEUM 
assigned to T'ylodelphys whose type is 7’. clavatwm (Nordm.). The larva of the 
latter is also known as 7. rachidis. Another species is T. exeavata (Rud.), 
recorded from Ciconiidae and rarely from Ardeidae and Podicipididae, the meta- 
cercaria being 7’, rachiaeum which occurs in the vertebral eanal of frogs, Rana spp, 
in Europe, while the cerearia oceurs in Plunorbts. In the cerearia ot T. excavata 
the four gland-cells are arranged in front of the ventral sucker, as in C. ameriannae. 
In the later stages pseudosuckers are present but are weakly developed, The 
structures have not been recognized in our metacercaria, In another T'ylodelphys, 
T. clavata, from Ardea and Circus, the metacere¢aria occurs in the vitreous humour 
of the eye of European freshwater fishes. 
SuMMARY. 
Furcocercaria lessoni, a new species of Strigeid larva from Limnaea and 
Planorbis, from the River Murray, is a pharyngeal, distome, longifurcate cercaria, 
with four pairs of glands and two excretory commissures. The metacerearia is a 
Tetracotyle encysting in freshwater leeches, and the adult is probably a species of 
Apatemon. 
C. ameriannae, a distome, longifureate, pharyngeal cercaria from Amérianna 
pectorosa, is characterized by the possession of four pre-acetabular gland-cells 
and of an exeretory system comprising 18 flame-cells and lacking commissures. 
The cercaria penetrates tadpoles and develops into an eneysted metacerearia of 
the Diplostomulum. type. The adult is probably Diplostome. 
ADDENDUM. 
Since this paper went to press, one by Olivier (Tr. Amer. Mier. Soc., 61, 1942, 
168-179) has come to our notice. In it is deseribed C. elodes which resembles 
C. ameriannae more closely than does any olher known to us, the only significant 
difference being that the four penetration gland-cells lie posterior to the ventral 
sucker in C. elodes, and the anterior to that organ in C, ameriannae. In hoth 
species the metacercaria develops in the notochord of tadpoles into a diplos- 
tomulum, It seems certain, therefore, that the two larvae are very closely related 
and may represent young stages of two different species of the same genus, 
