Testaceous Pneumonobranchous Mollusca of Great Britain.” 507 
those of an oolite formation, perhaps on account of the quantity 
of lime which is necessary for the secretion of its shell and win- 
ter epiphragm. 
H. fusca, p. 330. 
Common in moist woods of the North of Devon. It fre- 
quently exceeds the size mentioned in the former part of my 
Synopsis. 
H. trochiformis, p. 331. 
In the same situations as the last, Wiltshire and Devonshire. 
Rathgael House, County Down, Ireland (Mr. Cleland); Eton, 
and Tenby ; Rev. Dr. Goodall. 
H. Mortoni, p. 332. 
Box, near Bath, rare. 
H. aculeata, p. 332. 
In moist woods of Devon and Wiltshire 
H. lamellata, p. 333. 
* Animal pale grey,” Mr. Alder; who very obligingly furnished 
me with specimens of this and other rare species of the North 
of England. 
H. sericea, p. 333, lege globularis, P3 ui 
Animal albidum, anteriüs griseum. Sustentaculum bre- 
vius crassum. 
Abundantly in the South of Devon: also at Tenby (Rev. Dr. 
Goodall); and Salisbury. Neighbourhood of Dublin: Appen- 
dix to Welsh and Whitelaw’s Hist. of Dublin. 
"The H. sericea of Draparnaud is a very different species from 
this. The name of granulata, given to the present by Dr. Tur- 
ton and adopted by Mr. Alder, is objectionable, as indicating 
an imperfect appearance of the specimens ; but I rather doubt 
its being distinct from the H. hispida. It is not uncommon in 
many 
