SNAILS IN HYDE PAEK. 27 



and may be easily discerned under the microscope.* 

 These small snails, which are often very destructive 

 in gardens, lay from forty to fifty eggs in August 

 and September, from which the young are excluded 

 in about three weeks. H. hispida has been found 

 under stones in Hyde Park. 



Mr. Gwyn Jeffreys has described another species, 

 If. concinna, closely allied to the last named, but 

 differing in having a more glossy shell, which is 

 never globose like hispida, and has the umbilicus 

 more open, with the hairs more scattered and more 

 easily shed. The animal, too, is of a darker colour, 

 with a narrower and less fleshy foot. 



A smaller species still is H. rotundata (PL I,, 

 fig. 5), which may be found under stones and bark, 

 and amongst moss and dead leaves, and is every- 

 where tolerably common. The shell, as its name 

 implies, is nearly circular, more compressed below 

 than above, rather thin, but nearly opaque, and 

 moderately glossy. It is of a yellowish-brown, or 

 horn colour, transversely marked with reddish-brown 

 streaks. 



* See a note by Captain Bruce Hutton in the " Zoologist," 

 1862, p. 7977. 



