34 MOLLUSCA FROM THE CRAG. 



as I am not aware of its having been found elsewhere, excepting in the contempora- 

 neous formation in Belgium. The reversed variety, Table xix, fig. 13, is from the 

 cabinet of Mr. Gil)son. It was found at Walton-on-the-Naze, by the late Rev. Mr. 

 Rogers, of Lackford, in 1820, and is the only specimen I have ever seen. Another 

 very short variety is in my cabinet, but much worn. 



BucciNUM,* Linn. 1767. 

 Tritonium. Midler, 1/74. 



Gen. Char. Shell subovate or ovato-conical, generally ventricose ; spire slightly 

 elevated ; apex rather obtuse ; aperture large and oval, with an emarginate base ; 

 outer lip simple, sometimes sinuated, and without denticulations ; inner lip slightly 

 expanded, columella smooth. Operculum corneous. 



The common Bnc. undatim may be considered as the type of this genus, which 

 intervenes between and connects Nassa on the one side, with Trophon on the other. 

 The close resemblance of the animal of Trophon {Fums) antiquum to that of the common 

 whelk has induced some conchologists to unite them in one genus. The short and 

 emarginate base is here considered sufficient to separate these shells from Tro])hon, and 

 the large open naked aperture from Nassa. 



1. BucciNUM Dalei. /. Soiv. Tab. Ill, fig. 10, n — d. 



BucoiNUM Dalei. J. Sow. Min. Couch, t. 486, fig. 1, 2, 1825. 



— OVUM. Turt. Zool. Journ. vol. ii, p. 366, pi. 13, fig. 9, 1827. 



— Dalei. Ni/st. Coq. foss. de Belg. p. 570, 1844. 



— CEAssuM. ... p. 5C9, t. 44, fig. 7. 



— Dalei. _ S. Wood. Catalogue 1842. 



Halia Flemingiana. Macgill. MoU. Aberd. p. 189 (fide Jeffreys). 



Bale. Hist, and Antiq. of Harwich, pi. 10, fig. 3, 9, 1730. 



B. Testa ovato-conicd, ventricosd, striata, crassd, apice obtuse ; anfradihus con- 

 vexiusculis, inf erne dilatatis, suturis prof undis ; aperturd ovatd ; canali brevi ; labro acuto, 

 intiis incrassato. 



Shell ovato-conical, somewhat ventricose, transversely striated, thick and strong, 

 with an obtuse apex ; volutions somewhat flattened on the upper half, dilated on the 

 lower part ; aperture large and ovate, with a wide and short canal ; outer lip sharp 

 and plain, thickened inwardly, and a broad expanded inner lip. 



Axis, from 1 to 21 inches. 



Locality/. Cor. Crag, Ramsholt and Gedgrave. 



Red Crag, Walton Naze and Sutton. Recent, British Sea. 



This species is exceedingly abundant at Walton-on-the-Naze, where the specimens 

 are generally in a high state of preservation, but it is rarely found in the CoraUine Crag. 

 It is very variable in the proportionate dimensions of the aperture, some having it half 

 the length of the axis of the shell, while in others it is two thirds, and in the young shell 



* Etym. Buccinwn, a trumpet, or fish with a shell like a trumpet. 



