6 MOLLUSCA FROM THE CRAG. 



2. SUCCINEA OBLONGA. Drop. Tab. I, fig. 6. 



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

 HELIX ELONGATA. Daudeb. Hist, des Moll. pi. 1 1, fig. 1-3. 

 AMPHIBULINA OBLONGA. Pfeif. 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. 11, 1844. 



S. Wood. Catalogue 1844. 



8. Testa elongato-ovatd, tenui ; spird elevatd, acuminatd ; apice obtuso, suturd profundd; 

 anfractibus tridus subobliquis ; 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. 



Lam. 1799- 



LIMNEUS. Drop. 1805. 

 LYMN^US. Brand. 1815. 

 LYMN^A. Desmarest. 

 LYMNEA. Risso. 1826. 

 LIMNEA. Flem. 1828. 

 LYMNUS. Montf. 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 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. Atpvatos, of stagnant water. 



