54 NEW-YORK FAUNA — MOLLUSCA. 



This species is closely allied to Say's S. campestris, and he thinks it may possibly be allied 

 to Helix put r is of Linneus. The whorls of this species, as far as I have seen them, are not 

 as convex as in the following species ; but it must be confessed that these are scarcely appre- 

 ciable differences. I have obtained it in the neighborhood of New-York, and from Littlefalls 

 in Herkimer county, and the vicinity of Lake Champlain. It is found adhering to weeds, 

 and, when alive, is finely variegated with light horn-color and olive-brown : the shell is also 

 very flexible. 



SuCClNEA CAMPESTRIS. 

 PLATE IV. FIG. 54. a. b. — (STATE COLLECTION.) 



Succinea campestris. Say, Nich. Ency. No. 1. Journ. Acad. Nat. Sc. Vol 1, p. 281. 

 S. id. Gould, Invertebrata of Mass. p. 195, fig. 126. 



Description. Shell oval, thin, very fragile, transparent. Whorls three, not very oblique, 

 very convex ; the last very turgid. Suture deep. Aperture suboval, almost as broadly 

 rounded above as below. 



Color. Olive yellow to pale yellow. Animal whitish, with a black line passing under the 

 eyes. 



Length, 0-3-0-6. 



This species is found more remote from water than any of the preceding. The markings 

 of the animal may be as distinctly seen through the shell as in <S. obliqua. 



Succinea avara. 



PLATE IV. FIG. 55. — (STATE COLLECTION.) 



S. avara. Say, Long's Exped. St. Peters, \o\. 2, p. 260, pi. 15, fig. 6. 

 jS. vermela? Say, Desc. terr. and fluviatile shells, p. 23. (Adult.) 

 S. id. Adams, Amer. Joum. Science, Vol 40. p. 270. 

 jS. avara. Gould, Invertebrata of Mass. p. 196, fig. 127. 



Description. Shell quite small, very thin and fragile, and usually covered with an earthy 

 crust. Whorls three, rounded, minutely wrinkled : suture deep. Body-whorl very large. 

 Aperture in the adult half as long, and in the young two-thirds of the whole length of the 

 shell. Spire elongated, small and acute. 



Color. Pale reddish yellow or straw-color, often covered with a blackish earthy crust and 

 agglutinated minute pebbles. 



Length, 0'2; of aperture, - 15. 



This species was first detected by Say in the Northwest territory. It has since been 

 observed in the Northern and Middle States. My specimens were obtained from an island in 

 Lake Champlain. 



