118 NEW UNIONIDJE, MELANIDtE, ETC., 



ble in the other, while it really has it slightly. There is also a disposition to a 

 carina round the umbilicus, but by no means so marked, there being only, in that 

 region, a strengthening of four or five of the stride which border the umbilicus, which 

 is by no means as open as in the other. The aperture in this specimen, which seems 

 to be adult, has a fine black linear border. The body whorl is of a fine green and 

 the apex is reddish brown. 



I name this after T. R. Ingalls, M. D., Greenwich, N. Y., to whom I am indebted 

 for many fine species from this distant locality. 



RiVULINA MACULATA. PI. 22, fig. 10. 



Testa ovato-conica, virido-lutea, brunneo-maeulata, crassa, imperforata, lajvi ; suturis valde impressis ; an- 

 fractibus instar quinis, convexis ; apertura subrotunda, intus alba ; columella per alba, callosa. 



Shell ovately conical, greenish gellow, brown spotted, thick, imperforate, smooth ; 

 sutures very much impressed; whorls about five, convex; aperture nearly round, 

 within white ; columella very white and thickened. 



Operculum small, suboval, rather thin and subconcentric. 

 Pahidormis maculata, Lea. Proc. Acad. Nat Sci. 18.56, p. 110. 



Hah. — Ahmednugger, India, S. ShurtlejBf, M. D. 



My cabinet and cabinet of Dr. ShurtlefF. 

 Diam. -25, Length '44 inch. 



RemarTcs. — This little species is well characterized, and belongs to that group 

 which takes the general form of Paludina, and for which the generic name of Bivu- 

 lina has been proposed by I. Lea and H. C. Lea, Proc. Zool. Soc. London, 1850, 

 p. 196. Maculata is very much like Melania {Eivulina) Zeylmiica (I. Lea and H. C. 

 Lea) Proc. Zool. Soc. London, 1850, p. 194, but it is a smaller species, not so much 

 spotted and not quite so pointed in the spii'e. It is also closely allied to Paludomus 

 {Eivulina?) sinralis, Reeve, but is much smaller and more pointed in the spire. 

 In the two specimens before me, the maculations are disposed in rows, which leave a 

 vacant space below the middle of the body whorl. 



BiTHINIA SlAMENSIS. PL 22, fig. 11. 



Testa ovato-conoidea, palido-olivacea, tenui, diaphana, nitida, Isevi, arctissime umbilicata; spira subelevata; 



suturis linearibus ; anfractibus instar senis, convexis ; apertura ovato-rotundata, incrassata, superne 



angulata, intus albida. » 

 Operculo calcareo, extrinsecus striis concentricis, intus granulat^ 



Shell ovately conical, pale olive, thin, semitransparent, shining, smooth, narrowly 

 umbilicate; spire rather elevated ; sutures linear; whorls about six, convex; aperture 

 ovately rounded, thickened, angular above, within whitish. 



