530 ON A NEW SLUG OF THE GBNTJS JANELLA. [June 19, 



great weight to the separation of iV. duhia from J. bitentaculafa, 

 the specific distinctness of which yet remains to be proved '. It 

 will be as well, perhaps, to here state the sizes of the specimens 

 I have received from Mr. Suter, as indicating possibly the average 

 length which /. hitentaculata attains : these sizes are 32, 32, 40, 

 43, 45, and 48 millim. In a recent communication received from 

 Mr. Charles Hedley, he states that he has seen J. papillata 53 

 millim. in length. My largest specimen, in alcohol, measures 

 32 millim. 



St ■■ 



Digestive system oi Janella maculata. 

 (For lettering see p. 627.) 



The chief points of difference between J. maculata and /. hi- 

 tentaculata may be summarized as follows : — 



The form and length of tlie free oviduct and penis, the shortness 

 of the common duct, the form and divisions of the hermaphrodite 

 gland, the distinct form of the albumen-gland, and the minor 

 differences in the liver, colour of the animal, and general flattened 

 form of the whole of the body. 



In concluding this description I would remark that the wliole 

 family JanelUdce requires revision. It is very desirable that we 

 should have a series of coloured dra^^'ings taken from actually 

 living specimens of each species and variety, with careful drawings 

 of their anatomy. 



1 Ann. & Mag. N. H. 1892, vol. is. (ser. 6) pp. 169-171 ; Traus. New 

 Zealand Inst. 1892, pp. 156-162 ; Journal of Malacology, 1894, vol. iii. p. 13. 



