Class—Gasteropoda. 
Heap distinct, with eyes and tentacles. Body usually protected by a 
conical more or less spiral shell, often furnished with an operculum. 
ORDER—PULMONATA. 
Air-breathing, herbivorous gasteropods. Hermaphrodite. Breathing 
organ an air sac, lined by vascular network, and closed in front, situated 
behind the heart. Larva without any conspicuous velum.* 
Sub-Order—Stylommatophora. 
Eyes on the end of stalks, or processes of the body wall. No oper- 
culum. ‘Terrestrial. 
FAMILY—OLEACINID. 
Lingual teeth numerous, in more or less curved rows; the central 
teeth inconspicuous, the marginal aculeate, or with a_ single long 
recurved apex. Head short ; tentacles moderate, situated below the 
eye-peduncles. Body spiral, protected by a shell. Pulmonary opening 
on the right side, beneath the margin of the shell. Foot elongate, 
narrow, simple posteriorly. 
Sub-Family-—Flelicelline. 
Mantle-margin included. Shell discoidal, or trochiform, umbilicated, 
usually thin, many whorled ; peristome straight, acute. 
Genus, PATULA—Held. 
Shell umbilicated, depressed, discoid, or turbinate, rugose or cos- 
tulately striate ; whorls equal or gradually increasing ; aperture lunately 
rotund ; peristome simple, straight, acute. 
A. Umbilicus, narrow. 
P. chordata, Pfeifer; Malak. Bi. viii., 1861, p. 147; MEAT, 
vol. 5, p. 72, Wo. 200. Shell sub-perforate, globosely-turbinated, 
thin, somewhat closely covered with cord-shaped ribs, not shining, 
marbled minutely with whitish and reddish; spire convexly conical, 
somewhat sharp ; whorls 5, convex, the last slightly inflated at the base ; 
aperture a little oblique, lunar; peristome simple, straight, margins 
remote, columellar margin slightly reflected at the perforation. 
Diam., greatest, ‘15 ; least, ‘14; height, 12. (Pfr.) 
New Zealand (Hochstetter). 
* Siphonaria and Gadinia have a gill in the pulmonary cavity, and are thus 
passage forms between the Pulmonata and the Branchiata. 
B 
