6 MOLLUSCA FROM THE CRAG. 



2. SucciNEA OBLONG A. Drap. Tab. I, fig. 6. 



SucciNEA OBLONGA. Drop. Moll. p. 59, tab. 3, fig. 24-25, 1805. 

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

 Amphibulina oblonga. Pfe'iff. p. 68, t. 3, fig. 39, 1821. 

 SucciNEA OBLONGA. Russm. Icoii. 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. 11, 1844. 



— 8. Wood. Catalogue 1844. 



S. Testa eIonffato-ovatd,tenui ; spird elevatd, acuminata ; apice obtuso,suturdprofHndd; 

 anfractihis tribus stcbobliquis ; aperturd ovatd, spiram vix superante. 



Shell elongato-ovate, 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 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, Flem. 

 LiMN^A,* Lam. 1799- 



LiMNEUS. Drap. 1805. 

 Lymn.eus. Brand. 1815. 

 Lymn^a. Desmarest. 

 Lymnea. Risso. 1826. 

 LiMNEA. Flem. 1828. 

 Lymnus. Monff. 1810. 

 Leptolimnea. Swains. 1840. 

 Staonicola. 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 colu- 

 mella ; 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 marshes where 



* Etym. Ai/uvaios, of stagnant water. 



