22 MOLLUSCA FROM THE CRAG. 



1. RINGICULA BUCCINEA. /. Sow. Tab. IV, fig. 2, a d. 

 VOLUTA BUCCINEA. Broc. Sub Appen. pi. 4, fig. 9, 1814. 

 AURICULA BUCCINEA. J. Sow. Min. Conch, t. 465, fig. 2, 1823. 

 MARGINELLA AURICULATA. Dubois de Montp. pi. 1, fig. 15, 16, 1831. 

 PEDIPES BUCCINEA. Dvjard. Mem. Soc. Geol. de France, torn, ii, pt. 2, p. 2/7, 1837. 

 AURICULINA RINGENS, var. ft. Graf. Mem. sur la Fam. des Melan. p. 12, 1838. 

 RINGICULA BUCCINEA. Nyst. Coq. foss. de Beige, p. 604, pi. 45, fig. 12, 1844. 

 8. Wood. Catalogue 1842. 



E. Testa snbovatd, lavigatd, apice acuto, spird elevatd ; anfractibus, 5 6, subinfatis ; 

 basi emarginatd; columella plids tribus acutis ; labro marginato, cattoso, in medio inflate, 

 non crenato. 



Shell subovate, smooth, with an acute and rather elevated spire ; volutions, 5 6, 

 very slightly inflated ; columella with three folds ; base short, emarginate ; outer lip 

 thickened ; callous in the middle, not crenated ; inner lip spreading on the body whorl. 



Aans, { of an inch. 



Locality. Cor. Crag, Sutton. 

 Red Crag, Sutton. 



There is, in fact, but one acute and prominent tooth upon the columella, the upper 

 one is a thickening or compression of the inner lip upon the body of the shell, visible 

 only within the mouth ; the lower one is the replication of the lower part of the 

 columella. This is very abundant at the first-mentioned locality, where there is also a 

 small variety not more than one eighth of an inch in length. 



2. RINGICULA VENTRICOSA. /. Sow. Tab. IV, fig. 1, a b. 

 AURICULA VENTRICOSA. J. Sow. Min. Con. t. 465, fig. 1, 1823. 

 AURICULINA RINGENS. Grat. Foss. de Bord. p. 11, pi. 6, fig. 6, 7, 1838. 



R. Testa ovatd, inflatd, tumidd ; transversim sulcatd, spira brevi, acutd ; columella tripli- 

 catd ; labro expanso, adnato, cattoso, non crenato. 



Shell ovate, tumid, inflated, sulcated along the volutions ; spire short ; apex 

 acute ; outer lip thickened, without crenulations ; inner lip expanded. 



Axis, of an inch. 



Locality. Cor. Crag, Sutton. 

 Red Crag, Sutton. 



Abundant in the Red Crag, and very scarce in the Coralline. This and the pre- 

 ceding shell are considered as varieties by some conchologists. I am induced to 

 keep them separate for the following reasons. This is shorter, broader, more inflated 

 in the volutions than R. buccinea ; the exterior is deeply sulcated, and the two 

 uppermost folds are placed further apart ; the two lower plaits not reaching half-way 

 up the mouth, whereas, in R. buccinea, the three plaits are nearly equidistant, and 

 the two lower ones occupy at least two thirds of the mouth ; the form of the outer lip 

 in this shell is also more quadrate, and the inside of the outer lip is not so much 

 thickened, nor so callous in the centre. Among all my numerous specimens there are 

 no intermediate forms by which they can be fairly united. 



