20 Alfred Bell — Age of the Suffolk Boxstones. 



pieces occur in patches, on strings in slight depression of the soil 

 beneath, as if an ice-floe, loaded with these stones, had grounded, 

 leaving its hui-den intact. One such flint patch is present between 

 the Coralline and Red Crag at Pettistree Hall, Sutton, on the 

 Coralline Crag Hill of Prestwich,' where I saw it in situ. 



In the Newbournian period of the Red Crag, stormy seas seem to 

 have been the normal feature, churning up the disintegrated sea-floor 

 with its contents so as to make the fragments an integral part of the 

 deposit it was then building. 



The fossils selected in illustration of this paper have been chosen 

 as specimens of the various ways in wliich they occur, or as being 

 nnfigured species. The nomenclature I have used in tlds and the 

 earlier paper will not perhaps commend itself to some scientific 

 experts, but may be the better understood by ordinary workers in the 

 Crag as being the language they are more familiar with, and will 

 enable them to refer to earlier writers with greater facility. These 

 continual changes in nomenclature are very bewildering to 

 students in general. 



A further revision of material, lately come to hand, enables me 

 to add a few species to those already quoted in No. 639 of the 

 (tkological Magazinic, September, 1917. 



'> Liomesus Feldhausii (Beyrich), Zeitsch. deutsch. geol. Ges., vol. viii, 

 p. 243, pi. i, fig. 9, 1856. Mus. Pract. Geol. London. 



[Except that the boxstone shell is larger than the type there seems to be no 

 difference, either in form or sculpture.] 



Pseudocassis Harmeri, n.sp. (see p. 413 ante for reference). Harmer Coll. 

 Solarium Hornesii, Michelotti, Etud. Mice. inf. Ital., p. 92, pi. x, figs. 11-12, 

 1861. Mus. Ipswich. 



[Two examples, both showing the underside, may be referred to this species. 

 Moulds of the wall of the umbilical opening may be easily mistaken for the 

 upper whorls of a small Cancellaria.] 

 Cardiiim fragile, Broechi, Conch, foss. subap., vol. ii, p. 505, pi. xiii, fig. 4, 



1814. Mus. Pract. Geol. London. 

 2Iactra ovalis, J. Sowerby, Min. Conch., vol. ii, p. 136, pi. clx, figs. 2-5. 

 Mus. Pract Geol. London. 



[The two last-named occur with Pecten Rupiliensis, Pectunculus, and 

 a number of others — mostly imperfectly exposed bivalves — in an irregular plaque 

 of sandstone, see ante, p. 408.] 



EXPLANATION OF PLATES III AND IV. 



Plate III. 

 Fig. 



1. Fasciolaria erratica {T>e Koninck) , p. 411. la shows details of sculpture, 



lb the internal mould. Mus. Ipswich. 



2. Sip/zo iiauwi, n.sp., p. 411. Mus. Ipswich. 



3. ? Liomesus Feldhausii (Beyrich). Mus. Pract. Geol. London. 



4. Ficula acclinis (S. V. Wood), p. 412. Mus. Ipswich. 



5. Gominella conica, n.s])., II. 4tl2. Mus. Ipswich. 



6. Semicassis sahuron (Bruguiere), p. 412. British Mus. 



7. Pseudocassis Harmeri, n.sp., p. 413. Pseudomorph in a phosphatized 



matrix. Harmer Coll. 



8. Trigonostoma cf. amjnillacea (Broechi). Mus. York. 



9. Solarium Hornesii, Michelotti. Mus. Ipswich. 



1 Q.J.G.S.,vol. xxvii, 1870. 



