DESMOULEA CONGLOBATA. 89 



grannlata and N. proplitqua being tlie most abundant, in the upper zones of the 

 Red Crag N. iiicrassata, a species but faintly granulate, becomes fairly common, 

 the present variety being the most so. At the Icenian or Norwich horizon, N. 

 grannlata and N. iwopinqiia are exceedingly rare, Avhile N. iiicrassata becomes a 

 characteristic though not a very frequent species. 



The N. iiicrassata of the Italian Pliocene, figured by Bellardi (Moll. Terr. Terz. 

 Pieni., pt. iii, pi. vi, fig. 18), seems a somewhat different shell. 



The present variety appears to connect itself with the type, both in this 

 country and Scandinavia, by intermediate forms. In Crag times it appears to 

 have been more or less distinct. Two of the Recent specimens from the Mediter- 

 ranean figured by Prof. Kobelt {op. eit.) seem to be the same. 



Genus DESMOULEA, Gray, 1847. 

 Desmoulea conglobata (Brocchi). 



1814. Buccinum conglohahim, Brocchi, Conch, foss. subap., vol. ii, p. 33-i, pi. iv, fig. 15. 



1848-72. Nassa conglobata, S. V. Wood, Mou. Crag Moll., pt. i, p. 32, tab. iii, fig. 9, 1848 ; 1st Suppl., 



p. 15, 1872. 

 1875. Nassa conglobata, Seguenza, Boll. E. Com. Geol., vol. vi, p. 276. 

 1882. Nassa conglobata, Bellardi, Moll. Terr. Terz. Piem., vol. iii, p. 83, pi. v, fig. 17. 

 1901. Desmoulea conglobata, Cossinann, Ess. Paleont. comp., vol. iv, jj. 215, pi. ix, fig. 13. 

 1904. Nassa (Desmo^dea) conglobata, Sacco, Moll. Terr. Terz. Piem., pt, xxx, p. 66, pi. xv, figs. 6S, 64. 



Specific Characters. — See Mon. Crag Moll., pt. i, p. 32. 



Dimensions. — L. 35 mm. B. 26 mm. 



DistribiLtion. — Fossil: Waltonian Crag: Walton-on-Naze, Beaumont, Little 

 Oakley. Newbournian : Sutton, Waldringfield. 



Italian Pliocene : Piacenza (Brocchi), Asti (Sacco). Sicilian: Altavilla, Legoli 

 (Seguenza). 



BemarJcs. — This species, formerly grouped with the Nassas, is now referred to 

 Desmoulea. It was known to Wood from Walton only, but I have found a 

 perfect and unworn specimen at Beaumont, and another, fragmentary, at Oakley. 

 There are two from Waldringfield in the Ipswich Museum, and one from Sutton 

 at Cambridge. 



Genus BUCCINUM, Linne, 1758. 



Remarks. — While the general facies of the Red Crag mollusca changes gradually 

 as we proceed from Walton to Butley, we find at Oakley, where on the whole the 

 fauna is similar to that of Walton and prevalently southern, the abrupt appearance 



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