xara UN A. SYM BLO LC AEN Diane A 
No. 4.—CARIDINICOLA, A NEW TYPE OF 
TEMNOCEPHALOIDEA. 
By N. ANNANDALE, D.Sc., F.A.S.B., Superintendent of the Indian 
Museum. 
The object of the present note is to give a concise systematic 
description of an interesting symbiotic flatworm and to state what 
little is known of its habits. In preparing the description I have 
been indebted to the assistance of Mr. F. H. Gravely, who will, 
I hope, publish before very long a detailed anatomical account of 
the Temnocephaloidea represented in the collection of the Indian 
Museum and will discuss the morphology of the species described 
below. 
Poe SY SHE MAT TG. 
Class TEMNOCEPHALOIDEA. 
It is perhaps doubtful whether the members of the so-called 
class Temnocephaloidea are sufficiently distinct from the Trema- 
toda to be given that rank, and the peculiar little worm discussed 
in this paper is in many respects intermediate between the two 
““classes.’’ For the present, however, the recognized classifica- 
tion may be accepted as convenient. 
The Temnocephaloidea or Temnocephala, whatever their 
precise rank, are small parasitic flatworms with tentacles at the 
anterior end of the body anda large ventral sucker at the posterior 
extremity. They have a capacious sack-shaped alimentary canal 
with an anterior mouth but without a posterior aperture. The 
external surface is clothed with a delicate chitinous cuticle but in 
some cases bears cilia on certain parts of the body. Immediately 
below the cuticle there is a definite epidermis, in which, however, 
cell-walls do not occur. The genital organs lie behind or on the 
ventral surface of the alimentary canal in the posterior part of 
the body ; the genital pore is situated near the posterior extremity 
or in the middle of the ventra! surface. 
A single species (Scutariella didactyla)' has been found in 
Europe but the group as a whole is characteristic of tropical 
and subtropical, or at any rate southern countries. It appar- 
ently has its headquarters in Australia, but is also found in 
New Zealand, in Malaysia and in S. America. Only one Indian 
species | Wood-Mason (12)] has hitherto been identified,” nameiv 
Temnocephala sempert, Weber, which is common on freshwater 
1 Mrazek, Sitz. K. Bohm. Gesellsch. Wiss. Prag 1907, p. 1, pl. 
2 Mr. Gravely has recently identified specimens after comparison with some 
of Prof. Max Weber’s original examples from Java. 
