252 Transactions. — Zoology. 



In the above tables I have given only a small selection of 

 the specimens that I have examined and measured. 



DESCRIPTION OP PLATE X. 



Fig. 1. Parancphrops planifrons (Napier specimen) ; carapace from 



above. 

 Fig. 2, The same ; side view, to show arrangement of spines, &c., on 



carapace. 

 Fig, 3. T]ie same ; squame of antenna. 

 Fig. 4. Squame of antenna of Paranephrops tcnuicornis, Dana (after 



Dana).* 

 Fig. la. Parancphrops neo-zelanicus (Avon specimen) ; carapace from 



above. 

 Fig. 2a. The same; side view, to show arrangement of the spines, &c., 



on carapace. 



Note. — All the drawings are semi-diagrammatic. 



Aet. XXIX. — Note on the Parasite (Temnocephala) found 

 on the Freshwater Crayfish of Nciv Zealand. 



By Charles Chilton, M.A., B.S.C. 



[Read before the Oiago Institute, 11th September, 1888.] 



On both species of Parancphrops inhabiting New Zealand 

 an ecto-parasite is found belonging to the genus Tevmocephala, 

 an aberrant monogenetic trematode. This has been mentioned 

 by Wood-Mason,f who referred it to the typical species T. 

 chilensis, Gay. Specimens were afterwards sent to Dr. W. A. 

 Haswell, of Sydney, who has lately published a paper on the 

 genus, I and he has given it the name T. nova-zealandice. 

 Similar species are found on other freshwater crayfish of Aus- 

 tralia and Tasmania, each having its peculiar species of para- 

 site, viz., — 



T. fasciata, on Astacopsis serratus ; streams of New South 



Wales. 

 T. quadricornis, on Astacopsis franklinii; northern rivers of 



Tasmania. 

 T. minor, on Astacopisis bicarinatus ; streams of New South 



Wales. 



* This is taken from a tracing kindly made for me by Professor 

 Hutton from Dana's "Atlas," in the Canterbury Museum. 

 t "Ann and Mag. N.H.," ser. 4, xv., p. 336. 

 I " Q. J. of Micr. Science," xxviii., part 2, p. 279. 



