530 



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



great weight to the separation of JV. dubia from ./. 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 •/. bitentacuZata attains : these sizes are 32, 32, 40, 

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

 Mr. Charles Bfedley, he states that he has seen J. papiUata 53 

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

 32 millim. 



Fig 



Digestive system of Janella maculata. 

 (For lettering see p. 527.) 



The chief points of difference between J. maculata and J. bi- 

 tentaoulata may be summarized as follows : — 



The form and length of the 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. 



1 ii concluding this description I would remark that the whole 

 family Janellidce requires revision. It is very desirable that we 

 should have a series of coloured drawings taken from actually 

 living specimens of each species and variety, with careful drawings 

 of their anatomy. 



1 Ann. & Mag. N. H. 1892, vol. ix. (ser. (>) pp. 1G9-171 ; Trans. New 

 Zealand Inst. 1892, pp. 156-162 ; Journal of Malacology, 18'Jl, vol. iii. p. 13. 



