200 Transactions. — Zoology. 



Akt. XXII. — Contributions to New Zealand Malacology. 



By Professor F. W. Hutton. 



[Read before the Philosophical Institute of Canterbury, Ath November, 1880,] 



Plate VI. 



Placostyltjs bovinus. The odontophore lias 120-130 teeth in each 

 transverse row ; these rows ard shghtly curved forwards at the margins. 

 The centi-al teeth have sharp acute points ; the laterals are blunt and 

 rounded, with a slight cusp outside. 



Paryphanta gilliesii, Smith, in the Annals of Natural History, Series 5, 

 Vol. VI., p. 159. From Nelson. The shell is thin and flexible. 



Nanina. For a description of the animal of this genus see Strickland, 

 "Proceedings of the Zoological Society of London, 1848," p. 142. 



LiMAX MOLESTUS. Alimentary canal. The intestine turns forward and to 

 the right before receiving the hepatic duct, and turns to the right again, and 

 backward, round the aorta. It then passes to the posterior end of the 

 body, makes a single bend to the left, and passes straight to the anus. 

 (PL VI. f.A.) 



Reproductive organs. The ovo-testis is large, oval, and purple in colour; 

 it lays over the liver and intestine in an oblique position sloping backward 

 and to the left. The albumen gland is moderate and smooth. The penis- 

 sac lies to the right of the buccal mass ; it is broad and inflated, and the 

 retractor muscle is attached to the middle. There is a white prostate (?) 

 gland openuag into the penis with the vas deferens. The spermatheca is 

 narrow, with a long neck. (PI. VI., f.B.) 



MiLAX ANTiPODUM. Alimentary canal. The intestine turns forward and 

 to the right soon after leaving the stomach, receiving the hepatic duct at 

 the bend ; it then turns to the left, over the aorta, and crosses to the left 

 side below the stomach. It then passes to the posterior end of the body 

 cavity by two spiral curves, made with the sun, and passes forward again 

 by two more curves in the opposite direction until it reaches the first turn 

 of the duodenum, whence it passes straight to the anus. (PI. VI., f.c.) 



Reproductive organs. The ovotestis is small, round, pale purple, and 

 hidden under the liver. The albumen gland is rather large, with crenated 

 margins. The penis sac is long and narrow ; the retractor muscle is 

 attached to the middle. The spermatheca is oval, with a short neck. There 

 is no prostate, but a large two-lobed accessory gland opens into the com- 

 mon genital opening by numerous small convoluted tubes. (PI. VI., f.n.) 



Aeion incommodus. Alimentary canal. The intestine passes backward 

 from the stomach and then, some distance from the hepatic ducts, turns 



