84 Transactions.— Zoology. 



Art. ly^.— Descriptions of Neio Species of New Zealand Land 

 and Fresh-water Shells. 



By H. SuTEE. 



Communicated by the Secretary. 



[Bead before the Philosophical Institute of Canterbury, 6th November^ 



1890.] 



Plates XVI.-XVIII. 



Rhytida meesoni, n. sp. Plate XVI., fig. 1, a, b, A. 



Shell subcliscoidal, depressed, umbilicated, horny with a 

 greenish hue at the base, shining, thin and fragile, transparent, 

 epidermis with fine growth -lines, shghtly wrinkled and mal- 

 leated. Spire flat. Whorls 3, slightly convex, rapidly in- 

 creasing, periphery rounded, the last somewhat deflexed 

 anteriorly. Suture not deep. Aperture obliquely lunate- 

 oval. Peristome simple, acute, margins approximating and 

 joined by a faint callus. Columellar margin arched, reflexed 

 at the upper part, shghtly callous. Umbilicus moderate, 

 deep, open, about one- sixth of the diameter. 



Diameter, 0-4;5in. (ll-5mm.) ; height, 0-24in. (6mm.). The 

 largest specimen I have seen measured O'Sin. by 0-26in. 



Hab. South Island : Wairoa Gorge, near Nelson (J. T. 

 Meeson). 



Named in honour of Mr. J. T. Meeson, of Christchurchr 

 to whom we are indebted for this addition to our land- 

 shells. 



Animal. — Amongst the specimens Mr. Meeson kindly gave 

 me there were some in which the dried-up animal was left, 

 and of those I succeeded in preparing the radula. 



Jaw none. 



Dentition : 12 — — 12. Transverse rows of teeth forming 

 an acute angle. Teeth slender, aculeate, increasing from the 

 centre up to the 10th, which is the largest. The 11th is not 

 half as long, and the last rudimentary, not found on the pos- 

 terior part of the radula. The 10th tooth has an angular ridge ; 

 all the others are smooth. 



Patula mutabilis, n. sp. Plate XVI., fig. 2, a, b, B, C. 



Shell subdiscoidal, depressed, umbihcated, white, some- 

 times horny, irregularly streaked with rufous, but the white 

 form seems to be predominant ; faintly shining, rather thin, 

 transparent; with sharp, rather distant arcuated plaits, di- 

 rected strongly forwards on the surface, slightly undulating 

 on the side, the interstices with numerous fine growth-lines. 

 Eibs about 13 in the tenth of an inch (5 per mm.). Spire 

 slightly elevated, flat. Whorls 5^, narrowly rolled up, 



