112 MR. G. W. SMITH AND DR. E. H. J. SCHUSTER ON 



EXPLANATION OF THE PLATES, 



Talitriator easttvoodce, gen. et sp. nov. 



All the figures have been drawn with the aid of a Camera lucida, 



PlATE X. 



Fig. 1. Antennule. 



2. Antenna. 



3. Upper lip. 



4. Lower lip. 



5. Maxillipeds. 



6. Gnathopod 1. 



7. Crnathopod 2. 



PlATE XI. 



Fig. 8. Pereiopod 3. 



9. Branchial appendage of Pereiopod 4. 



10. Pereiopod 5, 



11. Pleopod 3. 



12. Sketch of pleon, showing comparative size of appendages , 



13. Dorsal aspect of posterior part of body. 



14. Uropod 3. 



15. Telson. 



9. The Genus Engceus, or the Land Crayfishes of Australia. 

 By G. W. Smith, M.A., Fellow of New College, 

 Oxford, and E. H. J. Schuster, M.A., D.Sc, F.Z.S., 

 Fellow of New College, Oxford. 



[Received August 8, 1912 : Read November 26, 1912.] 



(Plates XII. -XXV.*) 



Index. 



Pages 



Geographical Distribution and Taxonomy 112-116 



Ethology 116-118 



Systematic : Five new species of Engceus 118-126 



Introduction. 



The existence of burrowing forms of Australian Crayfish, 

 which live in underground tunnels excavated in damp soil, was 

 first made known by Erichson, who described two species from 

 Tasmania and placed them in a new genus, Engceusf. Besides 

 the two Tasmanian species, a very large collection of these 

 burrowing Parastacidse from Victoria has gradually accumulated 

 in the collection belonging to the Melbourne Museum, chiefly 

 through the activity of Messrs. Kershaw and Fulton, and the 

 present memoir is founded on this large collection a.nd also on 

 specimens which one of us obtained in Tasmania in 1907-8. 



Before proceeding to the description and classification of this 



* For explanation of the Plates see pp. 126, 127. 



t Archiv f. Naturg. vol. xii. 1846, p. 102. 



