ON A PRORHYNOHID TQRBELLARIAN. 631 



On a Prorhynchid Turbellarian from Deep Wells 



in New Zealand. 



By 



Williaiu A. Haswcll M.A., D.Sc, F.R.S., 



Professor of Biology, Sydney University. 



With Plate 48. 



In 1892' I announced briefly the discovery of this remarkable 

 Turbellarian, which was found by Dr. Charles Chilton in deep 

 wells in Canterbury, New Zealand, among other animals, 

 chiefly Crustacea, of which he has since published a valuable 

 account.^ At that time the general examination which I had 

 made of the specimens had led me to the conclusion that the 

 new form found its nearest allies in the Alloiocojla. The 

 series of lateral diverticula of the intestine, the complex struc- 

 ture of the pharynx, the entire absence of a body-cavity, and 

 other features led me to take this view. A more thorough 

 examination, however, with the aid of sections of better pre- 

 served specimens, has led to the result that, while having 

 certain points of afiiuity with the Alloiocoela, the new form 

 finds its nearest allies by far in the family Pror hynchidse, 

 and is in many respects closely related to the genus Pro- 

 rhynchus, while presenting some remarkable features in which 

 it difl'ers not only from that genus, but apparently from all the 

 rest of the Rhabdocoela. 



^ "Jottings from the Biological Laboratory of Sydney University, No. 17, 

 Three Zoological Novelties," 'Proc. Linn. Soc. New South Wales,' 2nd 

 series, vol, vii. 



- ' Trans. Linn. Soc' (2), vol. vi, pp. 163—284. 



