HuTTON. — On some Pulmonate MoUusca. 167 



the teeth point forward. There is no jaw. The radula has 44 transverse 

 rows of teeth, which form an angle of about 105°, saHent anteriorly. PI. 

 IV., fig. o.) The teeth are 29-1-29. The central tooth has five or six 

 denticles on each side of the median cusp, and on the right side the margin 

 is finely but variably denticulated ; the median cusp bears a single blunt 

 cutting point. On each side there is a snigle lateral tooth, which, however, 

 is often divided into two ; it is very variable in shape, but more or less 

 quadrate, with a variously denticulated cutting point. Outside this the 

 teeth are all aculeate, and increase in length toward the margin. (PI. IV., 



fig. F.) 



In the paper already mentioned, I stated that I had failed to discover 

 how the oviduct was connected with the albumen gland, but on the 5th 

 September, 1879, I found a specimen in which the oviduct was distended 

 with ova, and which showed clearly that my supposed accessory gland is the 

 commencement of the oviduct. The sketch on PI. IV., fig. w, is from this 

 specimen. 



Lymn^a stagnalis. This species has been introduced intentionally into 

 the river Avon at Christchurch, and is now abundant below the Acclimati- 

 zation Gardens. 



EXPLANATION OF PLATE III. 



Note. — The numbers under the teeth give the longitudinal row of that tooth from the 



centre. Teeth belonging to the central row have no number. 



A. Patiila coma. Teeth X 480. 



B. Patula hypopolia. Teeth X 480. 



C. Patula ignifiua. Teeth X 480. 



D. Placostylus bovimis. Teeth X 150. 



E. Daudebardia novoseelandica. Teeth X 80. 



F. Helix fatua. Teeth X 480. 



G. Blilax antipodum. Teeth X 280. 

 H. Limax agrestis. Teeth X 280. 



I. 3Iilax emarginatus. Teeth X 280. 



K. Arionfuscus. Teeth X 480. 



L. Patula coma. Jaw X 80. 



M. Patula ignifiua. Jaw X 40. 



N. Helix fatua. Jaw X 80 ; a end of jaw further enlarged. 



0. Placostylus bovinus. Jaw X 15. 



P, Limax agrestis. Jaw X 15. 



Q. Milax antipodum. Jaw X 15. 



E. Arion fuscus. Jaw X 35. 



S, Milax emarginatus. Jaw X 15. 



