150 Transactions. — Zoology. 



Hab. Cliristchnrck and Eyreton. In damp situations, under decaying 

 leaves, etc. 



This species must, I suppose, have been introduced in some way from 

 England, though there are difficulties in this belief, for I have found it 

 abundantly at two places several miles apart, separated by rivers over 

 which animals of this kind cannot easily cross, and, moreover, it does not 

 appear to be widely distributed in England, for Bate and Westwood say 

 (p. 461) : — " We believe that this species has only hitherto been found in 

 Mr. C. Spence Bate's courtyard and cellar, and that of the neighbouring 

 houses, at Plymouth, where it is tolerably abundant." 



I have, however, no doubt that my specimens cannot be distinguished 

 specifically from Philongria rosea, and we must therefore await further in- 

 formation before we can decide whether it has been introduced or not. 



EXPLANATION OF PLATE XVIII. 



Apseudes timaruvia. 

 Fig. 1. Dorsal view x 14. 



2. Upper antenna x 34. p, the crenulated process on the basal joint, a, setae and 



auditory cilium from one of the joints of flagellum, more highly magnified. 



3. Lower antenna x 60. 



4. Mandible x 34. 



5. Second maxilla x 40. 



6. Maxillipede x 60. a, last two joints seen full face. 



7. First gnathopod x 14. a, part of the same showing the shape of the fingeis. 



8. Second gnathopod x 24. 



9. Third thoracic leg x 19. a, end of the same x 40. 



10. Last (seventh) thoracic leg x 19. 



11. Pleopodum x 60. 



Art. XI. — On some Points of Difference between the English Crayfish (Astacus 

 fluviatilis) and a New Zealand one (Paranephrops setosus). By Charles 

 Chilton, M.A. 



[Read before the Philosophical Institute of Canterbury, 6th July, 1882.] 

 Plates XIX.-XXI. 

 The following paper is an attempt to contrast the structure of the New 

 Zealand crayfish, Paranephrops setosus, with that of the English one, Astacus 

 fluviatilis, as it is described by Professor Huxley in his recent book " The 

 Crayfish." * 



In Miers' " Catalogue of the Stalk- and Sessile-eyed Crustacea of New 

 Zealand " three species of Paranephrops are described as belonging to New 

 Zealand. These are P. jilanifrons, P- setosus, and P. zealandicus. Of these 



* International Scientific Series, vol. xxviii. 



