246 I'KOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



di-s-ision of the Stylommatophora (t.c, p. 85) into Plcurommatophora 

 (true laud-pulmonata) and Mesommatophora (Athoracophoridae), seems 

 not to be generally known, thongh highly important. 



One of our species, A. marnwyatus, Mts., approaches the genus 

 Aneiiea in the situation of the anus close to the mantle-area. There 

 is no diverticulum of tlie crop in At/ioracopJionis, such as occurs in 

 Aneitca Graefel, according to Keferstein and Bergh, the crop having 

 been taken for the stomach. A renal duct is always present in 

 Athoracophorus, but it seems to be wanting in Aneitca. 



Key to Species. 



A. Mantle-area not defined. 



(I. Colour dirty yellow, with darker spots and dashes. 



b. Body senii-cyliudrical, long and narrow, dorsal 

 grooves slight, penis namu-cd abnipthj in the 

 middle, thence convolute and thin. duhiiis. 



hb. Back much more flattened, dorsal grooves more dis- 

 tinct, penis iiarrowing (jradiKdUj towards its 

 distal end. hltcutaculatus. 



(«(. ColoiU' dirty yellow, without spots. I'enis short, no con- 

 voluted distal portion. antipodariDu. 



A A. Mantle-area well defined. 



a. Anal opening near the foot margin, below the pulmonary 

 orifice. 

 b. Back more or less strongly granulate and papillate. 

 c. A few slightly larger papilhie in each lateral 

 area on the back, which are not very conspicuous. 

 Free oviduct not dilated. papUlatus. 



cc. One, or usiially two, large, conspicuous papillae 

 of lighter colour in each lateral area on the back, 

 near the median dorsal groove. Free oviduct 

 dilated. Bcndiji. 



cec. The whole back covered with large, oval papilla, 



giving it a grape-like appearance. SimrotJii. 



bb. Back smooth, or faintly granulate, colour dark, marbled, marmorcus. 

 aa. Anal opening outside the right anterior angle of mantle- 

 area. Largest species. marmoratus. 



Fam. ATHORACOPHOEIDiE, 



Including the genera Atlioraropliorus, Gould; Aneiiea, Gray; 

 ? Aneitella, Cockerell. 



Genus ATHORACOPHOPtUS, Gould. 



Gould, U.S. Explor. Exped. Moll., vol. xii (1852), p. 1. 

 {Janella, Gray, 1850, non Grateloup, 1838.) 



