72 Mr. W. E. Collinge on the Anatomy of 
The specimens upon which I have worked were sent by 
Mr. R. Murdoch to Mr. W. Moss, and were collected near 
Stratford, North Island, New Zealand. 
Although Hedley’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 the 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 of 
this interesting region. A detailed account of the anatomy 
from fresh specimens is much to be desired. 
Anatomy. 
The alimentary canal is very short. The buccal mass 
measured 12 millim. in length (Pl. Il. fig. 28). The 
cesophagus 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 cesophageal 
opening. 
The pedal gland (PI. II. fig. 29) has the usual position ; 
it is considerably smaller than in either the genus Rhytida or 
Paryphanta, 
The Generative Organs (Pl. II. fig. 30).—The vestibule 
is a spacious chamber leading directly into the vagina; on 
the 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, 
vil. pl. 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 (Pl. II. fig. 30, p.). The retractor 
muscle is small and short; it arises from the body-wall imme- 
diately below the penis. 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 
walls, and the prostatic canal can be easily traced the whole 
of its length. I failed to find any trace of a receptaculum 
seminis. There is a large albumen gland and a small herma- 
phrodite gland, the duct of the latter being comparatively 
short and slightly convoluted. 
