218 LAND AND FRESH- WATER SHELLS OF N. A. [PART I. 



brownish, entering callus ; colnmella slightly thickened, not reflected, nor 

 truncate, making a continuous curve with the peristome. Common 

 length of axis about 50 mill., diameter of large whirl rather more than 

 25 mill. 



(^Bulla) Zebra mulleri, Chemnitz, IX, P. 2, p. 24, pi. cxviil, f. 1815, 1816. 

 Helix {CocMoslyla) undata, Fekussac, Tab. Syst. p. 32, no. 337; Hist. 



pi. cxv, f. 1, 4 ; pi. cxiv, f. 5, 6. 

 Bulimus (0.) undatus, D'Okbigny, Cuba, I, 174, pi. vi, f. 9, 10. 

 Bulimus zebra, Binney, Terr. Moll. II, 271, pi. liv. — W. G. Binney, Terr. 



Moll. IV, pi. Ixxvii, f. 13?— Pfeiffer, Mon. Hel. Viv. II, 143. 

 Orthallcus undatus, Shuttlewoeth, Not. 63, pi. iii, f. 4, 5. — Pfeiffer, Mon. 



Hel. Viv. IV, 589.— Tryon, Am. Journ. Conch. Ill, 1G6, partly only, 



pi. xiii, f. 1, 2, not 3 (which is 0. zebra'?) (1867). 

 Bxdimus reses. Say, New Harm. Diss. Dec. 30 1830; Binney's ed., p. 39. 

 Agalina fuscata, Rafinesque, Enum. and Ace. p. 3 (1831) ; Binkey's and 



Tkyon's complete edition, 68. 



Animal thick and massive, clirty, or yellowish-white, darker on 

 the middle of the back; surface rugose, with prominent, oblong 

 glands, and deep furrows. Whole length, exclusive of eye- 

 peduncles, three inches. Eye-peduncles, when fully extended, 

 one inch long, bulbous, with small, black, ocular points ; tentacles 

 one-fifth of an inch long, slender. Orifice of generation behind 

 the tentacle on the right side. Mantle somewhat bilobed, pro- 

 truding beyond the aperture, and slightly reflected. Posterior 

 extremity rounded, sides corrugated, lower surface smooth, 

 squalid. 



Found in Jamaica and Cuba, and at Key West ; also at 

 Mazatlan. The specimens figured in the Terrestrial Mollusks 

 were received from the southern part of the peninsula of Florida. 



This species inhabits trees. It attaches itself to the tree 

 during hibernation, and covers its aperture by an opaque, inspis- 

 sated, glutinous secretion, which, though exposed to wind and 

 rain, forms a perfect adhesion and protection to the animal, and 

 only yields to its own solvent powers on the approach of spring. 

 It exists in great numbers ; and the dead shells are a favorite 

 habitation of a species of hermit crab. 



The figure of the animal of Orthalicus given on p. 216, is 

 reduced from a drawing prepared for the Terrestrial Mollusks, 

 but not there figured. On plate 77, fig. 13, of vol. IV, I have 

 given another view of the same shell, also prepared for publica- 

 tion in the Terrestrial Mollusks. I am not certain from what 



