var. 



b. 



RUGOSA 



var. 



c. 



ELONGATA 



var. 



d. 



TH1AEA 



var. 



e. 



FENESTRALIS 



var. 



/■ 



DEFORMIS 



var. 



9- 



CONCINNA 



var. 



h. 



COSTATA 



var. 



i. 



PERVERSA, t. 



GASTEROPODA. 33 



Locality. Cor. Crag, Gedgrave. 



Red Crag, Sutton. Recent, Mediterranean. 



When my Catalogue was compiled I possessed but two or three specimens from 

 the Red Crag, and those not in very good condition. A few have lately been obtained 

 from the Coralline Crag, at Gedgrave, by Mr. Daniels, and myself. These are in better- 

 preservation, and sufficiently perfect to bear a fair comparison, and may be considered 

 as identical with the recent species from the Mediterranean. They appear to be the 

 same as the Buc. elegans of Dujardin, some specimens of which, from Touraine, 

 were given to me by Mr. Lyell. It is different from the figure of B. prismaticum, 

 Broc, Table v, fig. 7, as pointed out by Philippi. 



10. Nassa eeticosa. /. Sow. Tab. Ill, fig. 10, a — h. 



Nassa iieticosa, var. a. vulgaris. S. Wood. t. 3, fig. 10, a. 



10, b. 



10, c. 



10, d. 



10, e. 



10,/. 



10, g. 



10, h. 

 fig. 13, a — b. 

 Buccinum reticosum. J. Sow. Min. Conch, t. 110, fig. 2, 1815. 



— RUGOSUM .... 110, fig. 3. 



— EI.ONGATUM - - - - 110, fig. 1. 



— Nyst. Coq. foss. de Belg. p. 5/5, pi. 45, fig. 1, 1844. 



— — var. a. .... 45, fig. 2. 



— — var. b. .... 45, fig. 3. 



Dale. Hist, and Antiq. of Harwich, pi. 10, fig. 12, 1730. 



N. Testa elongatd, costatd, reticulata, rugosd, granulatd, striata vel sulcata ; spird 

 elevald, aliquando brevi ; aperturd ovatd ; basi reflexd, emarginatd ; labro intus denticulato. 



Shell very variable, sometimes costated, rugose, granulated, reticulated, striated, 

 or sulcated ; spire generally elevated ; aperture ovate, with a short emarginate 

 reflected base ; outer lip denticulated within. 



Locality. Red Crag, passim. 



This is one of the most abundant shells in the Red Crag, and specimens of one or 

 more of the varieties may be procured wherever a section of that formation is visible. 

 B. reticosum, Sow., is here considered as the type of the species, as they are all more or 

 less reticulated, and not all elongated. In some of the varities the outer lip is 

 thickened and denticulated within, while, in others, it is thin and plain. I have not 

 been able to identify N. reticulata with any of these varieties, and have not as yet 

 seen an undoubted specimen of that species from any of the three divisions of the 

 Crag formation. 



The duration of its existence appears to have been limited to the Red Crag period, 



5 



