72 PLIOCENE MOLLUSCA. 



Dimensions. — L. 25 mm. B. 14 mm. 



Bistrihution. — Not kiioAvn living. 



Fossil : Waltonian Crag : Little Oakley. 



Lower Pliocene : Ligurian coast. 



Bemarlis. — The unique specimen from Oakley here represented corresponds to 

 a specimen I obtained some years ago from the " argiles bleues," I believe at 

 Albenga, where Bellardi says this species is not uncommon. 



N. ligustica belongs to the scrrahi group, but it differs from that species in 

 form and sculpture, and is regarded by Bellardi and some other Italian 

 palaeontologists as distinct. In most of the Italian specimens of N. ligustica in my 

 collection the sculpture is somewhat finer than in those now figured ; Prof. 'Issel, 

 however, identifies the Oakley shell as a variety of that species. 



Nassa labiosa (J. Sowerby). 



1825. Buccinum labiosum, J. Sowerby, Miu. Couch., vol. v, p. 122, tab. cccclxxvii, fig. 3. 



1843. Buccinum labiosum, Nyst, Coq. foss. Terr. Tert. Belg., p. 577, pi. xliii, fig. 14. 



1848-72. Nassa labiosa, S. V. Wood, Mon. Crag Moll., pt. i, p. 28, tab. iii, fig. 8 ; tab. vii, fig. 22, 



1848; 1st Suppl., p. 15, 1872. 

 1871. Nassa semistriata, Jeffreys in Prestwich, Quart. Journ. Geol. See, vol. .\.\vii, pp. 144, 489. 

 1882. Nassa labiosa, Nyst, Conch. Terr. Tert. Belg., p. 31, pi. ii, fig. 13. 



1892. Nassa lahiosa. Van den Broeck, Bull. Soc. Beige Geol., vol. vi (Mcmoires), pp. 121, 132. 

 1912. Nassa lahiosa, Tesch, Med. v. d. Rijks. v. Delfstoffen, pt. iv, p. 80. 



Specific Cltitractcrs. — See Mon. Crag Moll., pt. i, p. 28. ^ 



Dimensions. — L. 16 mm. B. 8 mm. 



Distribufioii. — Not known living. 



Fossil: Coralline Crag : passim. Waltonian : AValton-on-Naze, 

 Beaumont, Little Oakley (abundant) ; less so but generally found at all horizons of 

 the Red Crag up to and including the Butleyan ; not reported from the Icenian. 



Belgium: Diestien; Scaldisien ; Poederlien. Holland: Scaldisien. 



Pleistocene of Sicily : Ficarazzi (F. W. H.). 



Bemarls. — The present species was unknown to Wood from Walton, and but 

 rarely from the later zones of the Red Crag. He was consequently disposed to 

 regard it as derivative in the latter from the Coralline. Recent researches, how- 

 ever, have shown it to be one of the characteristic fossils of the Waltonian deposits. 

 Prof. Kendall informs me it is common at Walton, as I have found it to be at 

 Beaumont and Oakley ; I have between 300 and 400 specimens of it in my collec- 

 tion from the latter place. M. van den Broeck gives it also from the later zones 

 of the Belgian Crag. 



I agree with Wood that our shell, although nearly allied to it, is not identical 

 with Buccinum semistriatum, Brocchi, of the Italian Pliocene, as believed by 



