Pe ee 6 Pe ee eae ee oe oe Se 
Dr. J. E. Gray on the Land Pulmoniferéus Mollusca, 267 — 
Fig. 14. Peltogaster suleatus ; the aninial seen from the left side: a, the 
: oO of adhesion; 5, the anterior orifice of the body. 
Fig: 15. Pe ogaster microstoma; the animal seen from the left side: 
a, the organ of adhesion; 6, the anterior orifice of the body. 
Fig. 16. The larva of P. microstoma, at the point of being hatched, seen 
from above. 
Fig. 17. The larva of a Pachybdella (after Cavolini). 
XXXV.—On the Arrangement of the Land Pulmoniferous Mol- 
lusca into Families. By Dr. J. E. Gray, F.R.S., V.P.ZS. 
THE opportunity of examining the genus Aneifea, and the addi- 
tional information obtained by the publication of the anatomy 
of it by Dr. Macdonald, and of that of Janella by Mr. Knight, 
has induced me to reconsider the subject of the arrangement 
of the terrestrial Pulmonata or Pul/monata geophila, given in the 
Catalogue of Pulmonata, or Air-breathing Mollusca, in the British 
Museum, published in the year 1855. 
I would suggest, for the arrangement given at page 2 of that 
Catalogue, the following :-— 
1. Putmonata GropHita. Eyes at the apex of an elongated 
lindrical peduncle. Tentacles cylindrical, shorter and lower 
downs than the eye-peduncle, sometimes very small or wanting. 
Operculum none (except in young Cryptelle?). Terrestrial. 
A. Head, eye-peduncle, and tentacles retraetile under the skin. 
Sect. 1. Vermtvora. Buccal mass very large, elongate, pro- 
jectile like a proboscis. Jaw none; teeth numerous, slender, 
conical, distant. Mantle well defined. Subterraneous; carni- 
vorous, or worni-eating. 
* The spiral part of the body near the middle of the back. Head 
without any lateral grooves from the front of the manile to the 
outer edge of the eye-peduncles. 
1. Oxrzactnip#. The tentacles cylindrical, simple ; the labial 
tentacles elongate, produced, flat, angularly bent. Shell oblong, 
spiral ; the outer lip thin, sinuous. Oleactna. 
It is to be observed that some Helicinide have shells 80 like 
Oleacina (as, for example, Achatina folliculus), that it is impossible 
to distinguish them from the shells of true Oleacine; yet Moquins- 
Tandon has figured the animal and the jaws of them, showing their 
Helicine character and phytophagous habit (see t. 20 & 22), and 
the animal and jaws have been observed in several other species 
that have been referred to this genus on account of the form of 
shell, The genus Halea, which differs from Oleacina only in 
18* 
