188 Transactions. — Zoology. 



disappears, so that it becomes oval in section, with convex 

 dorsal surface. The dorso-lateral margins may, however, be 

 turned upwards, so as to form a trough on the back of the 

 animal. I have seen this happen when one specimen is 

 crawling along the top of another, the upper one being 

 partly enclosed in the trough. Eyes small and rather few, but 

 continued abundantly round the horse-shoe-shaped anterior 

 tip. Length when crawling, about 28mm. ; breadth, 2-5mm. 



Two pattern varieties are about equally abundant, but 

 intermediate ones are also met with, and both are found in 

 the same localities : — 



(a.) Ground-colour of the dorsal surface warm brown, 

 mottled with a darker shade. The mottling is intensified to 

 form three dark-brown stripes, one very narrow median and 

 a pair of much broader ones, one just inside each dorso-lateral 

 margin. Lateral surfaces pale-brown, more or less mottled 

 with the darker tint, the mottling sometimes forming an ill- 

 defined stripe beneath a lighter marginal band. 



Anterior tip browm. Ventral surface pale-brown, finely 

 mottled all over with a darker tint, but not so dark as on the 

 dorsal surface. 



(b.) Characterized by the sharper definition of the three 

 dark stripes and the more or less complete absence of mottling 

 from the pale-yellow ground-colour. 



In spirit the quadrangular shape is well marked ; the peri- 

 pharyngeal aperture is a little behind the middle, and the 

 genital aperture about one-third of the distance from it to the 

 posterior end. 



Localities. — Gardens near Christchurch (both varieties 

 abundant ; coll., author). Ashburton (both varieties common ; 

 coll., Messrs. Maine and Fooks). Dunedin (speckled va- 

 riety; coll., A. Hamilton, Esq.). Bluff (a variety with two 

 extra fine dark stripes on each side, and with speckled ventral 

 surface; coll., author). 



Geoplana tenuis, n. sp. 



The single specimen, as it lay at rest, was very long and 

 narrow, and coiled up. When crawling it was also very long 

 and narrow ; strongly convex above, somewhat flattened be- 

 neath. The body was occasionally drawn in so as to become 

 comparatively short and broad. The anterior tip was slightly 

 injured, but numerous eyes were visible. 



Ground-colour of the dorsal surf ace bright grass-green, with 

 five dark-green stripes. A very narrow but well-defined me- 

 dian stripe is almost black ; on each side of this comes a 

 broad band of ground-colour; then a less sharply-defined 

 stripe of very dark green, two or three times as broad as the 

 median one ; then a band of ground-colour of about equal 



