PULMONATA. 59 



" Le teste qui lui est adherent n'est fixe au manteau que par 

 une couche tres-fine de tissue cellulaii-e, qui s'en detache poiu- 

 s'implanter sur le cord anterieur. Le mucus est blaiic argente." 

 — Morel et, 48. 



2. Drusia perlucidus. 



Body oval, depressed, nearly perlucid, white, marked with 

 black dots. Tentacles very small, with a black streak. ^lantle 

 oval. Shell ovate, horny, \^ith an indication of a whorl at the 

 top. — Quay. 



Limax perlucidus, Quoy <5* Gaim. Voy. Astral. Moll. ii. 146. 1. 13. 



f. 10-13. 

 Hah. Isle of France. 



Length \\ inch. The opening of the generative organs is be- 

 hind the base of the right tentacle. 



" Intermediate between Limax and Parmacellus," Quoy. 

 Though Quoy and Gaimard have not mentioned the subcaudal 

 gland, I have ventured to place it in this family with doubt. 



3. Drusia infumatus. 



Shell.— Limax {Axion) infumatus, Ferussac, Hist. Moll. ii. 96 '. 



t. 8F. f. 1,3. 

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

 Hab. ? 



Onlv known from Ferussac's figure. Deshayes observes, but 

 perhaps only from the figure, that the mantle shows no external 

 appearance of a shell. 



4. Drusia? Deshayesii. 



Parmacella, n. s. from Quran, Morelet, Moll. Fort. 45, not de- 

 scribed. 



Pai-macella Deshayesii, Moquin-Tandon, Act. Soc. Linn. Bord. 

 XV. 261. 1. 1. f. 6; Journ. Conch. 1851, p. 145. 



Hab. Quran. 



Very like P. Valenciennii, and may be a variety of it, but is 

 larger, browner, uniformly coloured, and emits a nauseous odour. 

 Jaw a thin crescent. — Morelet. 



5. Drusia Gervaisii. 



Shell elaw-hke, vcvy thin, whitish ; apex subspiral, rather 

 thickened, polished, yellow or greenish coloured. — Moquin. 



Animal olive-brown, spotless. Nocturnal. Mucus very shining. 

 — Faisse. 



