72 Mr. AV. E. CoUinge on the Anatomy of 



The specimens upon which I have worked were sent by 

 Mr. R. Murdocli to Mr. W. ]\Ioss, and were collected near 

 Stratford, North Island, New Zealand. 



Although Iledley's account was a valuable contribution at 

 the time to our knowledge of this species, it left much to be 

 desired as regards the figures and the minute detail of the 

 anatomy. I have endeavoured in the present paper to give 

 more careful drawings of the animal, and am able to supple- 

 ment in a few points his account of tlie internal structure. 

 Unfortunately in all the specimens the pallial complex had 

 been damaged in removing the shells before they came into 

 my possession, so that I am unable to give any description ot 

 this interesting region. A detailed account of the anatomy 

 from fresh specimens is much to be desired. 



Anatomi/. 



The alimentary canal is very short. The buccal mass 

 measured 12 millim. in leiigth (PI. II. fig. 28). The 

 oesophagus enters the dorsal surface 5 millim. from the ante- 

 rior end ; it is a short wide tube, and leads directly into the 

 crop, the internal walls of which are plicated. The salivary 

 ducts enter a little behind and lateral to the oesophageal 

 opening. 



The pedal '/land (PI. II. fig. 29) has the usual position; 

 it is considerably smaller than in either the genus Rhytida or 

 Paryphanta. 



The Generative Organs (PI. II. fig. 30). — The vestibule 

 is a spacious chamber leading directly into the vagina ; on 

 tlie left side the penis opens. This organ is a short tube and 

 exhibits little difference from the vas deferens, except that it 

 is slightly wider. In none of the specimens dissected had it 

 the form figured by Hedley (Proc. Linn. Soc. N. S. W. 1893, 

 vii. pi. X. fig. 9). All the portion from just above the retractor 

 muscle to the entrance into the vestibule is covered by a mass 

 of connective tissue, and when this is dissected away the ap- 

 pearance is as figured (PI. II. fig. 30, p.). The retractor 

 muscle is small and short; it arises from the body-wall imme- 

 diately below the jjenis. The vas deferens is a short tube not 

 sharply marked off from the penis. Where the common duct 

 commences the oviducal portion internally has richly folded 

 \salls, and the prostatic canal can be easily traced the whole 

 of its length. 1 failed to find any trace of a receptaculuni 

 seminis. There is a large albumen gland and a small herma- 

 phrodite gland, the duct of the latter being comparatively 

 short and slightly convoluted. 



