WOODWARD : ANATOMY OF NATALINA CAFFEA. 



271 



Gibbons, in 1880/ described the external characters very fully, and 

 I have nothing much to add to his description, except to note the 

 absence of a tail pore, and the fact that the swollen mantle-border 

 is of a rich orange-colour. As he pointed out, the accessory labial 

 tentacles are very prominent, but I should rather describe them as 

 hatchet- shaped, and note that they appear to be extremely sensitive, 

 being in all probability tactile in function, but not, I think, used for 

 prehension, as suggested for the same tentacles in Glandina. 



Natalina Cciffra, from life. 



Gibbons's specimen was fed on boiled potato, but showed a partiality 

 for animal food by seizing .a small living Ennea. I never observed 

 any tendency on the part of my animals towards a vegetarian diet, 

 but found them to be entirely carnivorous, eating either live snails 

 or raw beefsteak, on which diet they flourished extremely well, the 

 animals growing so large that they rarely withdrew completely into 

 their shells. 



Alimentary canal. — The most noticeable anatomical features, which 

 characterize the Agnathous Pulmonates, are the absence of any jaw 

 or beak-like structure, and the enormous size of the buccal mass, 

 the latter structure probably attaining its maximum development 

 in the genus Natalina. 



1 Journ. of Concliology, iii, 1880, p. 95. 



