SYSTEMATIC INDEX. 



Genus 2. 

 Testacella. — Cuvier. 



1. Haliotoidea p. 89, pi. IX, 



f. 24, 25 

 animal... p. 127, pi. XXVI, f. 1 



Genus 3. 



Arion Ferussac. 



Section 1 Shell oval, and concave. 



1. hortensis p. 90 



Section 2 Shell, if any, nearly cir- 

 cular, spongy, and rudimentary. 



2. empiricorum 90 



Genus 4. 



LiMAX.— Linnseus. 



Section 1. 



1. maximus p. 91, pi. IX, 



f. 26, 26* 

 animal... p. 127, pi. XXVI, f. 10 

 variety 11 



2. arboreus, animal .3, 4 



variety 2, 5 



young 6, 7 



LiMAX. 



Section 1. 



3. flavus p. 92, pi. IX, f. 27 



animal p. 128, pi. XXV, 



f. 21, 22 

 Section 3. 



4. cariuatus pi. IX, f. 28 



5. agrestis p. 93, f. 29 



animal... p. 128, pi. XXVI, f. 9 



Section 4. 



6. gagates p. 94, pi. IX, f. 30 



animal p. 129, pi. XXV, 



f. 14, 15, 16, 17 

 varieties 18, 19, 20 



7. Sowerbii, animal p. 12.S, pi. 



XXV, f. 12, 13 



8. ater, animal, young? p. 129, 



pi. XXVI, f. 13 



Family II Ancylid^. 



Genus 5. 



Ancylus MUller. 



Section 1 Animals sinistral. 



1. fluviatilis... p. 94, pi. X, f. 1, 2, 3 

 Section 2. — Animals dextral. 



2. lacustris p. 95, f. 4, 5, 6 



CLASS II. 



CONCHIFERA; OR BIVALVES. 



ORDER MONOMYARIA. 



Family I. — Mytilacea. 

 Genus 1. 



Dreissina Van Beneden. 



1. polymorpha ... p. 98, pi. X, f. 7, 

 8, 9, 10, n, 12 



ORDER DIMYARIA. 



Sub-Division I. — Lamellipedes. 



Family I Nayades. 



Genus 1 . 



Anodon Bruguiere. 



1. Cygneus p. 99 



