62 PULMOXATA. 



Perhaps the same as the former, but the shell does not agree, 

 and the description does not mention the aperture in the man- 

 tle, &c. 



3. GiRASIA EXTRANEA. 



" Shell a thin homy pellicle, without any appearance of a 

 spire. Mantle with a" circular opening showing the brownish 

 peUicle. Foot truncated behind, with a subcaudal pore the 

 whole height of the truncation, with a veiy strong keel above to 

 the back of the shield. The body encased in a nick in the back." 

 —Ferussac. 

 Limax (Arion) extraneus, Ferussac, Hist. Moll. ii. 96. 2. t. 8 F. 



f. 5, 7 ; Bull. Sci. Nat. 1827, x. 300. 

 Parmacella (extrauea). Gray, Fig. Moll. iv. 113. t. . f . . 



Hab. ? 



" We have not found in these two species {Arion Rangii and 

 A. extraneus), contracted in spirits, the orifice of the organs of 

 generation." — Fer. Bull. Sci. Nat. x. 300. 



M. Deshayes, in his description of Fe'russac's figure, appears 

 to have overlooked this authentic description of the animal. 



4. GiRASIA? PROBLEMATICA. 



Mantle much-produced, forming a collar in front. Body con- 

 vex and raised behind. Foot small, short. 



" Shell yellow, convex externally, concave internally, like a 

 half egg-shell."— jDesA. from Fe'russac's figui-e. 



Limax (Arion) problematicus, Ferussac, Hist. Moll. ii. 93^. 



t. 8F. f. 13-18 (16, 17 a shell?). 

 Parmacella (problematica), Gray, Fig. Moll. t. . f . . 



Hab. ? 



5. marij:lla. 



Mantle or body convex, produced like a fleshy collar in front, 

 swollen behind, and separated from the upper part of the foot, 

 in a cavitv of which it lies ; fringed on the side. Foot com- 

 pressed, truncated, and with an elongate perpendicular gland 

 behind. 



Shell quite hidden by the mantle, half ovate, soUd, with a thin, 

 horny, more or less expanded edge. 

 " Clypeidella, Valenc. MSS." B.M., not Clypidella, Swainson. 



