194 PNEUMONOBRANCHIATA. 



united to the upper angle of the outer lip ; peri- 

 stome with a white flat reflected margin ; umbi- 

 licus narrow. 



Pupa umbilicata. Drup. p. 62. t. 3. f. 39, 40.; 

 Jeffreys, Linn. Tran. xvi. 357. ; Rossm. t. 23. 

 f. 327. 



Pupilla DraparnaudiL Leach, Mollusc, p. 126. 

 Turbo muscorum. Mont. p. 335. t. 22. f. 3. ; 



Linn. Trans, viii. 182. 



Turbo cylindraceus. Da Costa, p. 89. t. 5. f. 16. 

 Bulimus muscorum. Brug. 

 Odostomia muscorum. Flem. Ed. Ency. 

 Jaminia muscorum. Risso, E. M. iv. p. 88. 

 Var. edentula. Mouth without teeth. 

 Under stones, in clefts of old walls, and under the 

 bark of trees, in shady places. Common in England 

 and Scotland. 



Animal granular, head and tentacles black, lower 

 very small; foot whitish. (Michaud.) 



Shell two lines long, dark horn-colour, glossy and 

 semitransparent ; spire composed of six rounded vo- 

 lutions finely striate longitudinally ; aperture 

 roundish-oval, with a broad, flat glossy white 

 margin, and a single tooth which is parallel 

 with the margin and close to the outer lip, 

 appearing like a curved continuation of the 

 margin itself; pillar with a large deep perforation 

 behind it. 



This does not appear to be the Turbo muscorum of 

 Linnaeus, who describes it as having no tooth in the 

 aperture, " apertura edentula ; " and no where men- 

 tions the remarkable broad white margin. 



Mr. Alder, on breaking some of these shells, found 

 them to contain (ten or twelve) young shells with the 



