MOLLUSCAN WORLD 



1 Helix albolabris 



This is the first snail that the writer remembers finding, when 

 a boy on his father's Green Mountain farm, in Hartland, Vermont. 

 Its generic name signifies a coil, while its specific name, from the 

 Latin albo (white) and labris (lip), describes the chief character 

 of the shell. This species is too well known to need further de- 

 scription in this place, and is given the place of honor in this 

 work, as the present volume is designed as a list of species per- 

 sonally collected by the editor, and as a list of West American 

 Mollusca in general. 



2 Helix sayi 



It was a proud boy who returned one day from the woods back 

 of the old farm house with a specimen of this beautiful snail — 

 and it was a sorry chap when its escape from its new home was 

 discovered. It was finally recaptured, and its shell now rests in 

 a tray in my cabinet. It was named for the eminent naturalist. 

 Thomas Say. The generic name Helix is not now used for these 

 snails, but it is hardly necessary to quote the list of synonyms 

 here. The specific name also will have to be discarded, if the 

 strict laws of priority were followed. 



3 Helix dentifera 



This is one of the rarest species in Hartland, Vermont, only 

 one specimen being found by my brother, John H. Orctt; several 

 specimens from this locality are in my cabinet that were collected 

 by C. 0. Tracy. 



4 Helix palliata 



Rare in Hartland, Vermont, but more abundant in some of 

 the more western states, ranging from Canada to Georgia and 

 Louisiana. 



5 Vitrina limpida 



Hartland, Vermont; rare. 



6 Hyalina arborea 



Hartland, Vermont; abundant. Occurs from Labrador to 

 Texas and New Mexico, and from Florida to California. 



Sbell umbilicated, depressed, very slightly convex, thin, pellu- 

 cid; epidermis amber-colored, smooth, shining; whorls 4-5, with 

 very minute, oblique striae, apparent when viewed with a mi°ro- 

 scope: aperture transversely rounded, peristome thin, acute; um- 

 bilical region indented; umbilicus moderate, well developed, 

 round and deep; greater diameter 5, lesser 4 mm, height nearly 3. 



This minute species I have detected near Julian, San Diego 

 county, Cal., as well as in New England. 



7 Hyalina ir.dentata 



Canada to Florida. Texas, Utah; Hartland. Vermont, rare. 



Resembles H: arbcreus, but is distinguished by its distant im- 

 pressed lines, by the enlargement of the last v horl, and no um- 

 bilicus. 



8 Hyalina lineata 



Shell widelv umbilicated. discoidal; enidermis greenish; 

 whorls about 4 visible on the base of the she'l as veil as above, 



