430 



SUPPLEMENT TO A "MONOGRAPH OF THE 



TEMXOCEPHALEuE."* 



By Professor William A. Haswell, M.A., D.Sc, F.R.8. 



(Plate xxii.) 



The present communication consists (1) of descriptions of three 

 additional species of Temnocp^hala, and (2) of some remarks on 

 certain points in the structure of the members of the family, 

 mainly suggested by a paper recently published by Monticelli. 



Temnocephala tasmanica, n.sp. 

 (Plate xxii., figs. 1-2.) 



This is a small species, never exceeding three or four millimetres 

 in length. It resembles T. quadricomis in having four long and 

 narrow tentacles (fig. 1) and a median dorso-ventrally compressed 

 lobe in place of a fifth tentacle. The median lobe is supported 

 on a stalk which is capable of being extended and contracted like 

 the tentacles themselves. 



The integument is devoid of pigment, and there are no eyes. 



The intestine is devoid of the constrictions and septa that are 

 regularly present in greater or smaller numbers in most of the 

 other Australian species. 



The posterior testes lie altogether behind the intestine, and 

 partly behind the genital cloaca. They are of rounded shape 

 with a process projecting inwards from which the vas deferens 

 takes its origin. The anterior testes lie opposite the posterior 



* Macleay Memorial Volume, pp. 93-152, pis. x.-xv. (1893). 



