GASTEROPODA. 291 
tecth like helix; S. putris has 50 rows of 65 teeth each. 
‘Thomson.) Inhabits damp places, but rarely enters the water. 
Distribution, 155 species. World-wide. 
Fossil, 7 species. Eocene. Britain. 
Sub-genus. Omalonyx, D’Orbigny. O. unguis, Pl. XII. , 
Fig. 24. 
Shell oval, convex, translucent, spire nearly obsolete, margins 
sharp. 
Animal large, slug-lke; shell placed on the middle of ths 
back, with the mantle shghtly reflected upon it all round. 
Distribution, 2 species. Bolivia, Juan Fernandez. 
BuLiMus, Scopoli. 
Etymology ? Boulimos, extreme hunger (in allusion to its 
voracity !). 
Synonym, Bulinus, Brod. (not Adans). 
Type, B. oblongus, Pl. XII., Fig. 10. 
Shell oblong or turreted; aperture with the longitudinal 
margins unequal, toothless or dentate ; columella entire, revolute 
externally or nearly simple; peristome simple or expanded 
Animal like Helix. JB. ovatus attains a length of six inches, 
and is sold in the market of Rio; it 
oviposits amongst dead leaves, the eggs 
haye a brittle shell, and the young when 
hatched are an inch long. (See p. 44, 
Fig. 31.) 
Sections. Odontostomus (gargantuus), 
Beck, aperture toothed. 13 species. 
Brazil. 
Pachyotis, Beck (Caprella, Guild.), 
Fig. 123.* 
Faria, Ker. P. faba, Pl: XII, 
Fig. 13, Tahiti. 26 species. Asiatic, 
Australian, and Pacific Islands, South 
America. The animal is ovoviviparous. 
Gibbus (Lyonnetianus) Montf. 
Shel? hump-backed. Mauritius, 2 
species. Fig. 123. 
Bulimulus, Leach. 8B. decollatus, Pl. XTI., Figs. 11 and 12. 
Shell small, lip acute. Above 800 species. England, 3 species. 
* Fig. 123, Bulimus auris-vulpina, Chemn. The great extinct land-snail of St. 
Helena; from a specimen presented by Chas. Darwin, Esq. Seo “Journal of a Voyage 
rouut the World.” 
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