84 NEW-YORK FAUNA — MOLLUSCA. 
PALUDINA DISSCISA. 
PLATE VI. FIG. 131. a. zp. —PLATE VII. FIG. 134. 
(STATE COLLECTION.) 
Paludina decisa. Say, Nich. Ency. pl. 2, fig. 6. Am. Conch, pl. 10. 
P. ponderosa. Desuayes in Lam, ( Young.) 
P. decisa. Apams, Am. Jour. of Science, Vol. 40, p. 266. 
P. id. Goutp, Invertebrata of Mass. p. 227; fig. p. 144. 
P. id. Ha Lpeman, Monograph, p. 1, pl. 1. 
Description. Shell ovate, elongate, thick and robust, often truncated at the apex. Whorls 
four to five, with minute transverse strie and revolving lines, rounded, and briefly turning 
into the suture, which is distinctly impressed. Aperture subovate, entire, and forming an 
angle above. Lip simple, but forms a rounded margin as it rises towards the columella. 
Opercle coriaceous, thin, concentrically striate. 
Color. Dark olive green. Aperture bluish white. Animal: Foot soiled olive, varied with 
orange ; tentacles olive, spotted with orange. 
Length, 1:0. Diameter, 0°7. 
This is the most common species in this State, and found in most of the ponds and slug- 
gish streams. The name originally given to it by Say, is evidently a misprint for disscisa. 
PaLupDINA INTEGRA. 
PLATE VIL. FIG. 132. a. YOUNG ; B. ADULT. 
(STATE COLLECTION.) 
P. integra. Say, Journ. Acad. Nat. Sciences, Vol. 2, p. 176. 
P. id: Ha.pemaAn, Monograph, ete. p. 10, pl. 3. 
Description. Shell rather solid, conic. Whorls six, wrinkled across. Spire rather elon- 
gated, entire at the apex. Suture profoundly indented. Aperture subovate, rather more than 
half the length of the shell. 
Color. Light olive green, tinged with rufous ; the callus margined with blackish. 
Length, 1-1; of aperture, 0°5. 
Mr. Haldeman has given an excellent figure of this species, which was first described by 
Say from immature specimens collected in Missouri. ‘The shells which are represented on 
the plate, were obtained from the River Hudson near Albany: they are among the largest 
measured. Farther south they appear to be larger still: the young shells, five-tenths of an 
inch long, are more globose. Mr. Cozzens has favored me with specimens from the River 
Passaic, which I refer to this species. ‘They were obtained two miles and a half below the 
Acquaconock church. The Passaic here flows over a sandstone bed, highly charged with 
iron; the shells are more rufous and ponderous. In the adult, an obsolete carina on the 
