XASSA LIMATA. GU 



Nassa microstoma, S. V. Wood. Plate IV, fig. 4. 



1848. Nassa prismatica, S. V. Wood, Men. Crag Moll., pt. i, p. 32, tab. iii, tig. G 

 1879. Nassa microstoma, S. V. Wood, Mon. Crag Moll., •2iid Siippl., p. 3, tab. i, fig. 4. 



Sjjecific Cliaracters. — Shell comparatively small, fairly solid, generally smooth 

 and polished, ovato-conical ; whorls distinctly convex, regularly tapering to a fine 

 point, the last more than half the total length ; ornamented by strong, clearly sculp- 

 tured longitudinal costge, 12 to 18 on the last whorl, with rather wide spaces 

 between, and by strong, well-marked and somewhat distant sjjiral lines; apex 

 acute; mouth small, suborbicular, angulated above; outer lip thickened outside by 

 a wide and prominent rib, grooved wnthin ; inner lip wide, plicated, covering the 

 [)illar, with a prominent tooth near the suture ; canal short, very narrow. 



TJimensions. — L. 10 — -14 mm. B. 5 — 8 mm. 



Distribufion. — Not known living. 



Fusxil : Coralline Crag : Gedgrave, Sutton, Boyton. Waltonian : 

 AValton-on-Naze, Beaumont, Little Oakley. Newbournian : Sutton, Waldringfield. 



Bemarhs. — This form seems to be distinct from any of those previously referred 

 to. I have found a dozen or more specimens of it at Oakley. It is much smaller 

 than N. prisinatlca, some of my Oakley shells measuring, though adult, not more 

 than 10 mm. in length; in sculpture, moreover, it differs from that species and 

 from N. limata ; the canal is narrow and does not turn so distinctly to the left. I 

 have figured an example for comparison with the shells before described, to show 

 the difference between them. N. m.lcro.^toma belongs to the prismatica group, but 

 out of a nimiber of specimens it is not difficult to separate them. 



In his second Supplement (p. 3) Wood suggested that this form Avas equivalent 

 to Biiccinnni elegans, Dujardin, now known as Nassa sprrfahiUs, Nyst; Prof. Peyrot, 

 however, has kindly sent me a specimen from the Faluns of Touraine showing it 

 to be different. The latter occurs also at Oakley, and is figured in PI. V, fig. IG, 

 of this work. 



Nassa limata (Chemnitz). Plate IV, figs. 1,2. 



1786. Buccinum limatuni, Chemnitz, Concli. Cab., vol. xi, p. 871, pi. clxx.wiii, tigs. 1808-9. 



1873-5. Nassa limata, Segueuza, Boll. R. Com. Geol., vol. iv, p. 300, 1873 ; vol. v, p. 276, 1874; vol. 



vi,p. 278, 1875. 

 1879-82. Nassa limata, Fonta,ui]es, Moll. Plioc. Vail. Elione., vol. i, p. 59, pi. v, fig. 3. 

 1886 Nassa limata, Dollfus et Dautzenberg, Et. prel. Coq. foss. Tour., p. 11. 



1887. Nassa limata, Kobelt, Icoii. sclialentrag. europ. Meei-escoucli., vol. i, p. 140, pi. xxv, figs. 10 — 15. 

 1890. Nassa limata. Cams, Prod. faim. Medit., vol. ii, p. 393. 

 1911. Nassa (Uzita) limata, Cerulli-Irelli, Faun, malac. mariana, pt. v. p. 248. pi. xl, fig. 11. 



Specific Characteis. — Shell ovato-conical, solid, much smaller and shorter in the 

 spire than N. prismatica ; whorls convex, the last rounded; ornamented with 



