88 NEW-YORK FAUNA — MOLLUSCA. 
AMNICOLA PORATA. 
PLATE XXXV. FIG. 333. 
Paludina porata, Say, Journ, Acad. Nat. Sciences, Vol. 2, p. 174. 
Amanicola id. Gou p, Invertebrata of Mass. p. 229, fig. 157. 
A. id. Hacpeman, Jour. Acad. Nat. Sciences, Vol. 8, p. 200. 
Description. Shell very small, obtusely conic or subglobular, thin, smooth or with minute 
incremental lines. Whorls four, very convex, and flattened near the suture so as almost to 
present a shoulder: suture very deeply impressed ; spire obtuse; aperture circular, the lip 
and pillar-lip being equally rounded, meeting above at a broad angle, the upper edge of the 
latter appressed to the preceding whorl; in the adult, barely touching the whorl just before 
it joins the outer lip, leaving a large and deep umbilicus. . 
Color. Olive-green, usually with a soiled coating of mud. Animal flesh-colored ; tentacles 
silvery ; eyes at the external base with a dark line extending along the tentacles. Length, 0°2. 
First observed at Cayuga lake, but common almost every where in brooks and muddy 
streams, attached to submerged stones and plants. Allied to A. dzmosa, but is larger, less 
solid, more globose, and with a distinct umbilicus. Mr. Haldeman, in the work cited above, 
describes the shell as ‘‘ very long and slender, with six obliquely revolving very convex turns, 
separated by a deep suture : aperture small, ovate, with the peritreme level and continuous, 
as in Cyclostoma.” I cannot venture to reconcile these two descriptions. 
(EXTRA-LIMITAL.) 
A. limosa. (Sav, Journ. Ac. Sc. Vol. 1, p. 125.) Shell conic, subumbilicate, obsoletely wrinkled; 
aperture ovate-orbicular ; suture impressed. Color, dark horn, generally encrusted with a blackish 
eoat. Animal whitish; head brown; mouth, tentacles, orbits and vitta on each side of the neck 
white; tentacles long and filiform: foot white, brownish above, short, suboval, truncated before, 
rounded behind. Length, 0-1. Delaware. 
A. grana. (Say, |. c. Vol. 2, p. 378.) Shell conic-ovate. Whorls convex, not perceptibly wrinkled; 
suture deeply impressed ; aperture orbicular, hardly angulated above ; pillar-lip with the outer edge 
appressed to the surface of the penultimate whorl; umbilicus rather small, profound. Allied to 
lustrica, but smaller. Length, 0-08. Pennsylvania. 
A. cincinnatensis. (ANTHONY, Bost. Jour. Vol. 3, p. 279, pl. 3, fig. 1.) Shell somewhat ventri- 
cose, subumbilicate. Whorls four, smooth; spire prominent and entire at the apex; suture deeply 
impressed; aperture much dilated, approaching to orbicular, nearly half the length of the shell 
Color, green. Length, 0°2. Cincinnati. 
A nichliniana, LEA. 
