EASTERN PROVINCE— INTERIOR REGION SPECIES. 339 



It appears to prefer the margius of water, on wet and marshy ground, 

 especially where there are fragments of wood saturated with water. 

 We are not aware of its having been found in any other situation. It 

 is also frequently taken on the leaves of flags {Iris versicolor), on the 

 stems of Pontederia, and other aquatic plants. 



It deposits its eggs, to the number of about twenty, enveloped in a 

 mass of thin, transparent gelatine, at the foot of aquatic plants. These 

 gelatinous masses are very numerous in the latitude of Boston in the 

 warm days of June. The eggs are oval and transparent. 



This is not the S. ovalis of Say. That shell having been found iden- 

 tical with S. obliqua, Dr. Gould proposes retaining the name ovalis for 

 this species. 



Mr. Gwynn Jeffreys refers the species to S. elegans, Eisso (Ann. and 

 Mag. K H., 1872, 246). 



Jaw (according to Morse) arcuate, ends blunt; anterior surface with 

 strong vertical furrows which modify the concave margin. A specimen 

 examined by me had a jaw with a smooth anterior surface and well- 

 developed median proiection. 



Mr. Morse gives 80 rows of 40-1-40 teeth on the lingual membrane. 

 A membrane examined by me (Terr. Moll., V, Plate X, Fig. M) had over 

 60-1-60 teeth. 



Sticciiiea avara. Say. 



Shell rather small, very thin and fragile, straw-colored, rosy, amber- 

 colored, or greenish; periostraca shining, or presenting min- i'ig-369. 

 ute hairy processes in the young; whorls 3, very convex, sep- /A 

 arated by a deep suture; last whorl rather large, not much W] 

 expanded; spire very iirominent, acute; aperture ovate, ^.„,,j„,(j 

 rounded at both. extremities, about half as long as the shell, enkrged. 

 Extreme length, about 6"™. 



Succinea avara, Say, Loug's ExpecL, ii, 260, pi. xv, fig. 6(1822); Bixxey's ed., 32, pi. 

 Ixxiv, fig. O.-GouLD, luvertebrata, 196, fig. 127 (1841).— Adams, Shells of 

 Vermout, 156 (1842).— De Kay, N. Y. Moll., 54, pi. iv, fig. 55 (1843).— Pfeif- 

 FER, Symbo]£E, ii, 56; Mon. Hel. Viv., ii, 525; iu Chemnitz, ed. 2, 51, pi. v, 

 figs. 18-20 (1854).— BiNNEY, Terr. Moll., ii, 74, pi. Ixvii, c, fig. 4.— W. G. 

 BiXNEY, Terr. Moll., iv, 35; v, 420; L. & Fr.-W. Sb., i, 262 (1869).— Morse, 

 Joiiru. Portl. Soc, i, 29, fig. 75; pl. ix, fig. 76 (1864) ; Anier. Nat., i, 607, fig. 

 47 (IHiiS).- Tryox, Am. Journ. Couch., ii, 2:« (1866). 



Succlnta Wardiana, Lea, Proc. Am. Pbilos. Soc., 1841, ii, 31; Trans., ix, 3; Obs., iv, 

 3 (1844).— Pfeiffer, Mou. Hel. Viv., ii, 525. 



Succinea vermeta, Say, teste Gould (see doul)tful species, p. 343.)— Tryon, Am, 

 Jonru. Couch., ii, 233, i>l. ii, fig. 10 (1866). 



