Vlll 



SYSTEMATIC INDEX. 



Planorbis. 



2. albus ... p. 18, pi. Ill, f. .30, 31 



3. Iffivis 37, 38, 39 



4. imbricatiis... p. 19, f. 40, 41, 42 

 Section 2. — Volutions carinated. 



.5. carinatus ... p. 20, f. 34, 3.5, 36 



6. marginatus ^ 26, 27, 28, 29 



7. vortex .'.... p. 22, f. 32, 33 



8. spirorbis p. 23, f. 19, 20 



Section 3 Shell shining, trans- 

 lucent ; spire deeply umhilicate ; 

 volutions provided with a slight 

 carina. 



9. nitidus ... p. 23, pi. IV, f. 1, 2 

 Section 4 Destitute of a carina ; 



volutions rounded both before and 

 behind, and deeply umbilicated. 

 10. contortiis... p.24, pi. Ill, f-24,25 



Genus 9. 



Segmentina — Fleming. 



1. lineata p. 25, pi. IV, f. 3, 4 



Family IV Colimacea. 



Section 1, — Animals with two ten- 



tacula. 



Genus 10. 



Cyclostoma Lamarck. 



1. elegans... p. 26, pi. IV, f. 10, 11 



2. marmorea p. 27, f. 13, 13 



Genus 11. 



Carychium — Miiller. 



1. minimum... p. 28, pi. IV, f. 8, 9 



Genus 12. 

 Acme Hartmann. 



1. fusca p. 28, pi. IV, f. 15 



2. miauta p. 29, f. 16 



Section 2. — Animals with four ten- 



tacula. 



Genus 13. 



SrcciNEA Drapernaud. 



1. amphibia... p. 30, pi. IV, f. 20, 21 



2. gracilis 22. 23, 26, 27 



3. oblonga p. 31, f. 19 



Genus 14. 



AcHATiNA. — Lamarck. 



1. acicula... p. .32, pi. IV, f. 28, 29 



Genus 1.5. 

 BuLiMus. — Lamarck. 



1. obscurus... p. 33, pi. I V,f. 24, 24* 



2. montanus p. 34, f. 17 



3. lubricus f- 12 



4. acutus p. 35, f. 31, 32 



Genus 16. 



Baljea. — Gray. 



1. fragilis p. 36, pi. IV, f. 30 



Genus 17. 



Clausilia. — Drapernaud. 



Section 1. — Shell smooth; the clau- 



sium or shelly plate ivitli a notch 



at top, fitting into a plait situate 



on the outer lip of the aperture. 



1. bidens ... p. 38, pi. IV, f. ,3.3, 34 

 Section 2 Shells corrugated, and 



with the clausium entire at top. 



2. biplicata p. 39, f. 3.5, 36 



3. rugosa p. 40, f. 37, 38 



4. Rolphii p. 41 f. .39, 40 



5. dubia 41, 42 



Genus IS. 

 Pupa Lamarck. 



1. muscorum p. 42, pi. V, f. 1 



2. unidentata p. 43, f. 2 



3. bidentala 3 



4. marginata p. 44, f. 4, 5 



5. umbilicata p. 45, f. 6 



6. Anglica p. 46, f. 7, 8 



7. juniperi p. 47, f. 9 



Genus 19. 



Vertigo Miiller. 



Section 1 Shells dextral, nearly 



cylindrical ; aperture externally 

 margined. 



1. edentula p. 48, pi. V, f. 10 



2. Pygmaea 11 



3. cylindrica p. 49, f. 12 



