J] | 
246 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 




division of the Stylommatophora (t.c., p. 85) into Pleurommatophora 
(true land-pulmonata) and Mesommatophora (Athoracophoridee), seems 
not to be generally known, though highly important. 
One of our species, A. marmoratus, Mts., approaches the genus 
Aneitea in the situation of the anus close to the mantle-area. There 
is no diverticulum of the crop in Athoracophorus, such as occurs i 
Aneitea Graeffei, according to Keferstein and Bergh, the crop haying 
been taken for the stomach. A renal duct is always present i 
Athoracophorus, but it seems to be wanting in Anertea. 
Kry To SPECIES. 
A. Mantle-area not defined. 
a, Colour dirty yellow, with darker spots and dashes. 
6. Body semi-cylindrical, long and narrow, dorsal 
erooves slight, penis narrowed abruptly in the 
middle, thence convolute and thin. dubius. 
bb. Back much more flattened, dorsal grooves more dis- 
tinct, penis narrowing gradually towards its 
distal end. bitentaculatus. 
aa. Colour dirty yellow, without spots. Penis short, no con- . 
voluted distal portion. antipodarum. 
AA. Mantle-area well defined. 
a. Anal opening near the foot margin, below the pulmonary 
orifice. 
b. Back more or less strongly granulate and papillate. 
e. A few slightly larger papillee in each lateral 
area on the back, which are not very conspicuous. 
Free oviduct not dilated. papillatus. 
ce. One, or usually two, large, conspicuous papillie 
of lighter colour in each lateral area on the back, 
near the median dorsal groove. Free oviduct 
dilated. Dendy. 
cee. The whole back covered with large, oval papille, 
giving it a grape-like appearance. Simrothi. 
bb. Back smooth, or faintly granulate, colour dark, marbled. marmoreus. 
aa. Anal opening outside the right anterior angle of mantle- 
area. Largest species. marmoratus. 
Fam. ATHORACOPHORID 2, 
Including the genera Athoracophorus, Gould; Aneitea, Gray ; 
? Aneitella, Cockerell. 
Genus ATHORACOPHORUS, Gould. 
Gould, U.S. Explor. Exped. Moll., vol. xii (1852), p. 1. 
(Janella, Gray, 1850, non Grateloup, 1838.) 
