504 MESSRS. WHITE A]*D TREACHER ON THE [Aug. I 906, 



(3) Angular chips of scales, bones, and teeth of fish : honey- 



coloured and transparent or translucent, to brown or flesh- 

 coloured and opaque. These exhibit all those features 

 that were noticed by Mr. A. Strahan 1 in the fish-remains 

 of the Taplow Chalk. Most of them measure between 0*2 

 and l'O millimetre in length. 



(4) Irregular, angular, and subangular lumps and platy pieces 



of calcite, dull white and translucent. The plates probably 

 are mainly fragments of oyster-shell, which yield precisely 

 similar debris when brayed. Usually under 1-0 mm. 

 in diameter. Light-brown and flesh-coloured, partly or 

 wholly phosphatized materials of the same forms also 

 occur. 



(5) Rod-like objects : smooth, cylindrical, or tapered — probably 



spines of echinoids. 



(6) Coprolites of small fishes, echinoids, and other animals : 



light to dark-brown ovoid bodies, occasionally of convolute 

 or strangulate aspect, and frequently polished. These 

 commonly range from 0-2 to 1-0 mm. in length. They are 

 rather scarce in the residues from bed (1) ; more common in 

 those from bed (3) ; and most common in those from the 

 lowest part of bed (5), where they attain their greatest 

 size. 



(7) Tests of Entomostraca. These are rare, and have not been 



recognized in the phosphatic state. 



(8) Quartz, in subangular and well-rounded, yellow or colourless 



grains. Not uncommon in bed (3) ; prominent in the 

 residues from bed (5). They rarely exceed 0*5 millimetre 

 in diameter. 



(9) Black granules — apparently of iron-oxide — minutely mam- 



millated. These occur throughout the section, being most 

 noticeable in the upper part of bed (5). Size : — 0*25 to 

 0-5 millimetre. 



(10) Rich brown, polished, phosphatic concretions of rounded or 



botryoidal form. Usually under 0-3 millimetre. 



(11) Dull green grains, imperfectly rounded ; noticed only in 



residues from the lower part of bed (5). 



The constituents just enumerated are mentioned, as nearly as 

 may be, in their order of abundance. It should be observed that 

 the character and relative proportions of the phosphatized materials 

 are much more constant than those of the calcareous. 



When the brown casts of foraminifera and the little brown con- 

 cretions (No. 10) are treated with hydrochloric acid, a variable but 

 usually small proportion is found to consist of a pale to dark-green, 

 opaque or translucent mineral (presumably glauconite), with a thin 

 veneer of phosphate. These disguised glauconite-concretions and 

 pseudomorphs are most common near the base of bed (5) in this 



1 Quart, Journ. Geol. Soc. vol. xlvii (1891) pp. 359-60 & figs. 2-6, p. 36(5. 



