of several undescribed Shells. ■4'03 



6. Ancilla rubiginosa. 



A. testa ovata, fusiformi, glabra, riifa ; spira elongata et aper- 

 tura lonjritudine eadem jraudentibus ; basi sulcis tribus ca- 

 naliculatis scabra. 



Shell ovate, fusiform, smooth, rufous : spire produced, as long 

 as the aperture; base with three channelled grooves. 



The prolongation of the spire forms the distinguishing cha- 

 racter of tliis species, which is of the greatest rarity. 



7. LiNGULA anulina of authors. 



L. testa depressa ; dorso corrugato ; basis dilatator extremitati- 

 bus divaricatis. 



Shell depressed ; the back wrinkled ; base dilated, the extre- 

 mities diverging. 



8. LiNGULA hia7is. 



L. testa subdepressa, convexa, dorso tautum non lavi ; basis 



contractte extremitatibus hiantibus. 

 Shell sub-depressed, convex, the back nearly smooth ; base 



contracted, the extremities gaping. 

 Tlie belief that two distinct shells had hitherto been confounded 

 under the common name of L. anatina, first struck me 

 when examuiing the magnificent collection ol Lord Tan- 

 kerville ; and the observations 1 have since made, and the 

 numerous specimens 1 have examined, have both tended to 

 strengthen this belief. I have therefore here assigned to 

 each ''its specific character; and have only to observe, in 

 this place, that the species to which I have retamed the ori- 

 .rinal name is that which has been so ably described by 

 Cuvier. That fextremity of the shell where the fleshy 

 pedmicle is attached, I have termed the base; although it 

 might perhaps with equal propriety be termed the umbones ; 

 in one species the valves at this extremity approach very 

 near each other; but in L. hians they are widely gaping. 

 9. Patella nigra. 

 P. testa depressa, ovata, nigra, sub-glabra ; vertice ad mar- 

 ginem anticum approximante ; margine interno hrvi, nigri- 

 cante ; disci albentis parte antica macula fulv.n tincta. 

 Shell depressed, oval, black, nearly smooth ; suunnit very 

 near the anterior marj^in; margin within smooth, blackish; 

 disk whitisii, the eve fulvous. 

 A very flat and remarkably large species ; its shape is per- 

 fectly oval with a few obsolete striaj; the apex slightly in- 

 curved, and very near the margin within the rim ol the ^licll 

 is a border of black. 

 Inhabits Calilbniia. Mr. Mawe. 



3 E2 lAXXUT. Ov 



