Anatomy of the Slug. 339 



is covered with unicellular glands, many of which contain the 

 deeply-stained mucus. 



Cystopelta at one time was placed in the Limacidae. Later 

 Tryon put in the Tebennophoridae, while Mr. Hedley's classifica- 

 tion is: — Family, Zonitidae : Sub-family, Helicarionnae ; 

 Genus, Cystopelta. 



The few differences I have noted in the specimens described 

 by Professor Tate, Mr. Hedley and myself incline me to the 

 belief suggested by Mr. Hedley in his paper, that the Tas- 

 manian, Victorian and New South Wales forms may in reality be 

 different species, but until they can be fully worked I prefer 

 to look on the Victorian form as a new variety which I name 

 " purpurea.'' 



I now wish to thank Professor Spencer, under whom this 

 work has been carried out, for his advice and assistance ; also 

 Mr. Hedley, Dr. Hall and others who at times have helped me 

 out of difficulties. 



LITERATURE. 



Cunningham, J. T.— " The Renal Organs of Patella," Q.J.M.S., 

 vol. xxiii. 



Hedley, C. — " On the Structure and Systematic Position of 

 Cystopelta." Proc. Linn. Soc, N.S. Wales, vol. v., 1890. 



Tate, R.— Trans. Roy. Soc. Tas., 1880, p. 17. 



Tryon. — '' Manual of Conchology, Series Pulmonata," vol. i., 

 p. 227. 



EXPLANATION OF PLATES. 



In all figures : — 



A.G. Albumen gland. 



A.O. Amatory organ. 



A. 0.0. Opening of the amatory organ into the genital atrium. 



AUR. Auricle. 



B.C. Buccal cavity. 



B.G. Buccal ganglia. 



B.M. Buccal mass. 



B.V. Blood vessel. 



C. Cilia. 



