444 EXPLANATION OF PLATES OF VOL. III. 



Fig. 2. Limax agrestis. 

 Fig. 3. campestris. 



LXV. Fig. 1. flavus with eggs. 



Fig. 2. Arion fuscus. 

 LXVI. Fig. 1. Ariolimax Columbianus, with the internal plate, head, and 



mantle. 

 Fig. 2. Arion foliolatus with the surface enlarged. Not an Arion. See 



p. 225. 



LXVII. Veronicella Floridana. 

 LXVII. a. Fig. 1. Vitrina limpida. 



Fig. 2. Succinea Concordialis. 

 Fig. 3. ovalis, Old., not of Say. 



Fig. 4. Nuttalliana. 



LXVII. b. Fig. 1 . Succinea campestris. 

 Fig. 2. Totteniana. 



Fig. 3. obliqua. 



LXVII. c. Fig. 1. luteola. 



Fig. 2. aurea. 



Fig. 3. Oregonensis. 



Fig. 4. avara. 



LXVIII. Strophia incana. 



LXIX. Fig. 1 . Macroceramus Kieneri : the outline natural size. 



Fig. 2. Cylindrella Poeyana, with enlarged view of aperture and apicial 



whorls. 



Fig. 3. Cylindrella jejuna. 

 LXX. Fig. 1. Pupa rupicola. 

 Fig. 2. contracta. 



Fig. 3. muscorum. 



Fig. 4. armifera. 



LXXI. Fig. 1. Vertigo milium. 

 Fig 2. Gouldi. 



Fig. 3. Pupa decora. 

 Fig. 4. Vertigo modesta = ovata. 

 LXXII. Fig. 1. Pupa pentodon. 

 Fig. 2. variolosa. 



Fig. 3. Vertigo simplex. 

 Fig. 4. Pupa corticaria. 

 LXXII. a. Chondropoma dentatum. A pectinate species not included in this 



volume. See Vol. IV. 



LXXIII. Helicina orbiculata: the lower line is Hel. tropica. See PL LXXII. a. 

 LXXIV. Fig. 1. Helicina occulta (recent). See PI. LXXII. a. 

 Fig. 2. " (fossil). 



Fig. 3. orbiculata. 



Fig, 4. chryosocheila. 



