GEOLOGY OF FOLKESTONE — THE GAULT 327 



common occruTence several species of Solarium, and at page 124 

 we liave figured one, 8, ornaMm. As tlie two forms, 8. clentatum and 



Lign, 41. — Solarium conoideum. 



8. conoideum are equally common and characteristic, we think it 

 right to present also their portraits. 



Lign. 42. — Dcmtaliiim decussatiim. 



The long pipe-like shells of Dentalium decussatmn will also be found 

 in abundance ; and in certain spots, if one is fortunate enough to 

 detect them, clusters of little nautilus-like shells, scarcely larger than 



Lign. 43. — Bellero'phina vihrayeana. 



small shot, may be collected. These, the Belleroj^tMna Vihmyeana, 

 are not cephalopods, but belong to a lower grade of mollusca, the 

 shell being open throughout, as in the common univalves, and not 

 divided by septa, or chambered, like the Kautilus and Ammonite, for 

 the young of which, from their mere exterior resemblance, they 

 might be at the first glance mistaken by an inexperienced naturalist. 



(To he continued.) 



