NATURAL HISTORY. 
41 
GALLERY.] 
plates which are found under the skin of the slugs and the different kinds 
of snails or Helices: as the Streptaxis, which has the axis bent on one 
side, as if the shell was crushed. The Grecian lamp (Helix Anas - 
toma ), which has the mouth turned up towards the whorls on the upper 
surface of the shell. The Proserpina , which has the cavity of the shell 
furnished with large continuous folds. 
Tables 27—29. Land Shells continued: as the different kinds of 
Hulimi; the puppets (Pupa); the closed shell ( Clausilia), which 
has a shelly valve that closes the mouth of the shell, placed behind the 
plait on the pillar, and the Achatince. Many of these shells deposit a 
large egg covered with a hard shell, like the eggs of birds. The eggs of 
different kinds are in the Case. 
Tables 29, 30. The Fresh-water Shells, as the different genera allied 
to Auricula , amongst which is the Carychium, the most minute of the 
British land shells; and the different kind of pond snails ( Limneus ), 
coil shells ( Planorbis ), and fresh-water limpets (Ancylus). The 
Amphibolce , from Australia. The Siphonarice, which so much resemble 
the limpets; and lastly, the various kinds of Cyclostomce and Helicinee, 
Tables 31—49. The Bivalve Shells, 
Tables 31, 32. The shell of the Venus family ( Veneridce), as the 
spiny Venus, Venus gnidia. 
Table 33. The Cardium, or Cockle family (Cardiadce). 
Tables 34, 35. The Mactra and Tellina families (Mactradce and 
Tellinidce); the Borers, or Pholadce, and the Watering Pot (Aspergil¬ 
lum), and Club Shell, Clavagella. 
Tables 36, 37. The Solen, Anatina, Chama, Etheria, Cardita, and 
Crassatella families. 
Tables 38—41. The fresh water bivalve; the Unionidee, or the 
Duck Muscle; Scotch Pearl Muscle; and Chinese Pearl Muscle, 
Dips as plicata. 
Table 42. The Area and the Iridina family. 
Tables 43—45. The Muscle and Pinna family, and Mother of 
Pearl shells. 
Tables 44—48. The Oyster, Pecten Spondylus, and Anomia 
families. 
Table 49. The lamp shell ( Terebratula ); Duck muscles (Lin¬ 
gula) ; the Cranice and Discince, the upper valves of which have been 
mistaken by some authors for limpets; the bones of cuttle fish 
(Sepia); the cartilaginous lances of sea leaves ( Loligo ), sometimes 
called sea pens. The fossil Belemnites , which are supposed to be similar 
to the small horny process at the end of the cuttle fish bone. The 
crozier shell ( Spirula ), and the different kinds of Ammonites and 
Nautili . 
JOHN EDWARD GRAY. 
Jan. 18, 1851* 
