116 THE NAUTILUS. 



Var. pindorina Duel., in Chenu's 111. Conch., ii, pi. 12, f. 

 10, pi. 17, f. 7, 8. 



punctulata Marr. Thes. Conch., iv, pi. 2, f. 12, 13. 

 harpularia (Lam.) Reeve, Conch. Icon., pi. 14, f. 28 

 (decorticated). 

 Var. venulata Lam. Ann. du Mus., xvi, 313, 1810. 



reticularis Reeve (pars) Conch. Icon., vi, pi. 10, f. 16 b. 

 obesina Reeve (pars) Conch. Icon., vi, pi. 10, f. 16 c. 

 mariae Ducros, Rev. crit., p. 50, pi. 2, f. 26. 

 Var. graphica Marr., Thes. Conch., iv, pi. 3, f. 36. 

 porcea Marr., Thes. Conch., iv, pi. 3, f. 35. 

 oblonga Marr., Thes. Conch., iv, pi. 2, f. 14. 

 Var. violacea Marr., Thes. Conch., iv, pi. 4, f. 56. 

 Var. ustulata Lam., Anim. sans vert., v, 620, 1822. 

 oriola Duel, (not Lam.), in Chenu's 111. Conch., ii, pi. 

 11, f. 1, 2. 



fuscata Marr., Thes. Conch., iv, pi. 2, f. 20-22. 

 brunnea Marr., Thes. Conch., iv, pi. 4, f. 54, 55. 

 Var. polpasta Duel, in Chenu's 111. Conch., PI. 17, f. 1, 2. 

 Var. cumingi Reeve, Conch. Icon., vi, pi. xi, f. 19. 



ligneola Reeve (pars) Conch. Icon., vi, pi. 21, f. 57 a b 

 (juv.) 



Bolten and Lamarck again refer to the same figure by Martini 

 (Conch. Cab., ii, tab. 48, f. 509). Bolten refers to it a second 

 time as his type of arachnoidea, while the figure he refers to as the 

 type of his litterata (Conch. Cab., ii, tab. 46, f. 488) is not suffi- 

 ciently characterized for varietal distinction. The above varie- 

 ties were briefly diagnosed in my previous paper (NAUTILUS, 

 xxiv, p. 122, 1911). 



ON CLASSIFICATION IN GENERAL AND THE GENUS 

 LYMNAEA IN PARTICULAR. 



BY HAROLD SELLERS COLTON. 



The value of the generic name is the subject of this paper. 

 To illustrate this, the genus Lymnaea is considered. 



The most recent classification of this group is that of F. C. 



