PULMONATA. 93 



No. 43. Ltmn,ea costellata. F. E. Edwards. Tab. XIII, fig. 10 a — b. 



L. testa ovato-ventricosd, sub-turritd ; spird mediocri, acuminata ; anfractibus quinque 

 vel sex, convexis, longitudinaliter sub-costellatis, et lineis incrementi subtilissime striatis ; 

 costettis obscuris, irregularibus, remotiusculis : aperturd ovatd, ampld, spirant in longitudinem 

 superanti ; labio rejlexo ; plied columellari vix tortuosd, rotundatd, parum eminenti. 



The striated Limncece generally acquire that character from the conspicuous lines 

 of growth ; but the present species presents obscure costellse, as well as the striation 

 due to the lines of growth. It is an oval, ventricose, sub-turreted shell, with a 

 moderately elevated spire and pointed apex, and formed of five or six convex volutions, 

 very finely striated by the lines of growth, and also longitudinally costellated ; the 

 costellse are obscure, irregular, and separated by broad shallow sulci, in which the 

 lines of growth are perceptible. The aperture is ovate, rather dilated, and a little 

 longer than the spire ; the columellar margin strongly reflected, and the fold rounded, 

 slightly twisted, and but little prominent. 



Independently of its costellated character, this species presents differences which 

 prevent its being confounded either with L. strigosa (Brogn.), or L. substriata (Desh.). 

 In the first species, the shell is more elongated, the aperture smaller, and the colu- 

 mellar fold resembles that of L. longiscata, of which I think it is merely a variety; in 

 the latter, the spire is more elevated, the aperture much contracted in front, and 

 altogether narrower ; and the fold is prominent and strongly twisted. 



The present appears to be a well-marked species. 



Size. — Axis, rather more than 1 inch; diameter, 4-10ths of an inch. 



Localities. — Hordwell ; Headon Hill. 



No. 44. Limn^la fabulum. Brogniart. Tab. XIV, fig. 10 a — b. 



Limneus fabulum. Brogn. 1810. Ann. du Mus., vol. xv, p. 375, t. 22, fig. 16. 



— — Brogn. 1811. Journ. de Pbys., &c. vol. lxxii, p. 423. 



Lymneus — Fer. 1814. Mem. geol., p. 61, No. 13. 



Limnea — ? Lyell and Mure. 1829. Sur les depots lacust. tert. du Cantal. 

 Lymn^a fabula. Desh. 1824 — 37. Desc. des coq. foss., &c, vol. ii, p. 96; t. 11, 



figs. 11-12. 

 _ _ Desk. 1830. Ency. Me'th. Vers., vol. ii, p. 361. 



Lymneus fabulum. Defr. 1835. Diet, des Sci. Nat., vol. xxvi, p. 462. 

 Limnea fabula. Nyst. 1836. Kech. coq. foss. de Hoesselt, &c, p. 20, No. 49. 

 Lymn^a fabula. Desh. 1838. 2d edit. Lam. Hist. Nat., vol. viii, p. 223, No. 9. 

 Limneus fabula? Nyst. 1843. Desc. des coq. &c. foss. des Terr. tert. de Belg., 



p. 469, t. 38, fig. 18. 



L. testa ovato-ventricosd, lavi, acuminata; anfractibus quinque vel sex, convexiusculis: 

 aperturd ovato-acutd ; plica columellari sub-acutd, parum tortuosd. 



