6 MOLLUSCA FROM THE CRAG. 



2. Succinba oblonga. Drop. Tab. I, fig. 6. 



Succinea oblonga. Drap. Moll. p. 59, tab. 3, fig. 24-25, 1805. 

 Helix elongata. Daudeb. Hist, des Moll. pi. 11, fig. 1-3. 

 Ampiiibulina oblonga. Pfeiff. p. 68, t. 3, fig. 39, 1821. 

 Succinea oblonga. Rossm. Icon. p. 92, t. 2, fig. 47, 1835. 



— Grateloup. Cat. des Moll, de Dax, p. 123, 1838. 

 Nyst Coq. foss. de Belg. p. 466, pi. 39, fig. 1 1, 1844. 



— S. Wood. Catalogue 1844. 



S. Testa elongato-ovatd, tenui ; spird elevatd, acuminata; apice obtuso, suturd profunda ; 

 anfractibus tribus subobliquis ; aperturd ovatd, spiram vix superante. 



Shell elongato-ovato, with an elevated and acuminated spire, and an obtuse 

 apex ; volutions three, rather oblique and ventricose, with a deep suture ; aperture 

 ovate, not exceeding the length of the spire. 



Axis, \ of an inch. 



Locality. Mam. Crag, Bulcham. Recent, Britain. 



One specimen of this species, from the the cabinet of Captain Alexander, is all 

 that I have seen. It appears to correspond with the recent shell, although the 

 suture is not quite so deep. This species is also found, I believe, abundantly at 

 Maidstone ; some specimens from that locality were given me by Mr. Morris, and I 

 have found the same species, though sparingly, at Clacton, in which specimens the 

 suture is rather deeper than in the Crag shell. 



Aquatic, Ftem. 

 LiMNiEA,* Lam. 1799. 



Limneus. Drap. 1805. 

 Lymn^eus. Brand. 1815. 

 LymNjEA. Desmarest. 

 Lymnea. Risso. 1826. 

 Limnea. Flem. 1828. 

 Lymnus. Mont/. 1810. 

 Leptolimnea. Swains. 1840. 

 Stagnicola. Leach. 1820. 

 Gulnaria. — 1820. 



Gen. Char. Shell ovate or oblong, sometimes elongate and acutely turreted, 

 smooth and naked ; spire always apparent, more or less elevated ; semitransparent 

 and of a subcorneous texture ; volutions convex, somewhat depressed, sometimes 

 tumid and rapidly enlarging ; aperture large, open, and ovate, with a flexuous or 

 plicated columella ; peritreme acute. 



Animals of this genus are inhabitants of fresh water, more especially of that 

 which is still and stagnant, although a few have been occasionally found in 



* Etym. At/jivalos, of stagnant water. 



