382 ON THE BITENTACULATE SLUG OF NEW ZEALAND. 



There is no such mantle as that described by Mr. Macdonald in the Aneiteuni Slug as 

 covering the roof of the pulmonary sac ; but there is a depression instead of it, and the 

 roof of the sac is extremely thin. 



In deference to the views of Dr. Gray, I have termed the covering of the lohole of the 

 upper surface of the animal "the mantle;" but, talcing into consideration that it would 

 he extraordinary that the eyes of the animal should be protruded through the secretory 

 organ of the shell, this interesting Gasteropod may more probably be regarded as quite 

 nahed. 



Believe, dear Sir, yours very truly, 



Charles Knight. 

 J. J. Bennett, Esq., F.R.S., 



Secretary of the Idnnean Society. 



EXPLANATION OF THE PLATE. 



Tab. LXVI. 



Figs. 1, 2. Dorsal aspect of Janella antipodarum. 



Fig. 3. Lateral view. 



Fig. 4. Portion of dorsum, enlarged, and showing — 



a. Small foramen anterior to pulmonary sac. 



d. Respiratory orifice. 

 Fig. 5. Lingual sac laid open. 



a. Plicated folds. 



b. Transverse rasp-like processes. 

 Figs. 6, 7- Horny plate of buccal mass. 



Fig. 8. Lingual sac and its tubular appendage. 



a. Tubular appendage. 



b. Sac. 



Fig. 9. Armature of lingual sac magnified. 

 Fig. 10. Magnified view of rasps. 



ff. Rasp. 



/. Plate. 

 Figs. 11, 12. Dental processes and plates on plicated appendages. 

 Fig. 13. Calcareous particles in wall of respiratory cavity. 

 Fig. 14. Conical cutaneous papilla. 



