2 WEBB : ANATOMY OF BULIMUS SINISTRORSUS, DESHAYES. 



Explanation' of Plate I. 

 BnJumts sinistrorsus, Deshayes, Lifu, New Caledonia. 



Figure i. The shell, three times the natural size. 



Figure 2. The genitalia. In three specimens in which the 

 spermatheca was dissected out, the shape of it 

 was, as is shewn in this figure. Only the 

 parts which remained unbroken have been 

 sketched, but a fair-sized albumen gland is 

 present, and the spermathecal sac is embedded 

 in it, at the point of its attachment to the 

 oviduct. 



Figure 2a. A variation in the spermathecal duct, observed in 

 one specimen. 



Figuke 3. The buccal mass (and its retractor muscle) slightly 

 flattened, with the odontophore and radula shewn 

 senii-diagrammatically through tlie wall. The 

 oesophagus. Left salivary duct. The nerve 

 collar (the cerebral antl pedal ganglia of one side 

 alone shew) and optic nerve supplying the left 

 ommatophore. It may be pointed out that in 

 BuUmus sinistrorsus the buccal mass cannot, 

 apparently, be retracted thrcnigh the nerve-collar. 



Figure 4. The jaw. A long transparent projection runs back- 

 wards and upwards. 



Figure 5. A median, the tv.-f) adjacent and two marginal 

 " teeth " from the radula. 



Figure 6. The nerve collar, semi-diagrammatic. (^nly the 

 nerves to the otocysts are shewn. 



N.B. — All the figures are enlarged. 



