﻿476 MESSRS. WHITE AND TREACHER ON THE [Aug. 1905, 



barely perceptible within them. Occasional small coprolites, fish- 

 teeth, phosphatized foraminifera, and the ubiquitous brown phos- 

 phatic concretions (up to three-quarters of an inch in diameter) 

 occur up to the top of the division. 



None of the ' scattered flint-nodules ' mentioned in connection 

 with this part of the section in Mr. Whitaker's ' Geology of London ' 

 (Mem. Geol. Surv. vol. i, 1889, p. 77) were seen by us. 



The foregoing description of this division does not agree with the 

 more general one given by Mr. Strahan, who refers to the rock as 

 a ' soft ' chalk 1 and as an ' ordinary non-phosphatic chalk/ 2 The 

 latter expression is an unfortunate one, as it tends to strengthen 

 the impression conveyed (perhaps unintentionally) by the context 

 of the essay in which it-occurs, that the Phosphatic Chalk of Taplow 

 is a lenticular inclusion in the flinty (Micraster cor-anguinuw) beds 

 seen in the neighbouring pits. 



The fossils found in the Upper White Chalk are : — 



Plicatula sigillina, S. P. Woodw. (c.) 

 Terebratulina striata, Wahl. 

 Serpula annulata, Reuss. 

 Serpula plana, Sow. (c.) 

 Cardial 'er (?). 



Pisces, (c.) 



Lamna appendiculata, Kg. (c.) 



Oxyrhina sp. 



Actinocamax granulatus (Blainv.) (c.) 



Scalaria decorata (?) Rcemer. 



Inoceramus Cuvieri, Sow. (r. e.) 



Ostrea hippopodium, Nilss. (r. c.) 



Ostrea lateralis, var. striata, Nilss. 



(r. c.) 

 Ostrea vesicularis, Lam. (c.) 

 Ostrea Wegmanniana, d'Orb. (r. c.) 

 Pecten cretosits, Defr. 



Echinoeorys scutatus, Leske. (o.) 

 Galerites albogalerus, Leske. 

 Oreaster bidbiferus, Forbe3. 

 Pentagonaster megaloplax, Slaclen. 

 Parasmilia sp. 

 Porosphcera globularis, Phil. 

 Ventriculites sp. 



Nearly all of the above are from the lower two-thirds of the 

 division. 



Actinocamax granulatus, though less frequently met with than in 

 the rich phosphatic band below, is still a common fossil, and in any 

 other section would be counted abundant. Not any of the guards 

 found are complete. The granulation is, perhaps, rather more notice- 

 able than in the majority of those obtained in the brown beds below, 

 and the alveolus seems of moderate depth — about a sixth of the 

 length of the guard, in the very few cases where a fairly -trustworthy 

 measurement can be obtained. The species becomes very scarce 

 towards the top of the section, and has not been seen in the hard 

 beds. 



The remains of EcJiinocorys scutatus are too incomplete to afford 

 a sure indication of the shape of the test. The least dam aged- 

 specimens obtained are of small size, with a thin test, which, in 

 one instance, possesses a curvature suggestive of a depressed ovate, 

 or subgibbous, variety. 



The small echinid-fragments referred to as Cardiaster (?) in the 

 above list are certainly not those of C. ( Off aster ) pilhda, Lam. 



A seam of Ostrea lateralis, var. striata, was found about 8 feet 

 above the very ill-marked base of this Chalk. 



1 Q.uart. Journ. Geol. Soc. vol. xlvii (1801) p. 356. 



2 'Natural Science ' vol. i (1892) p. 286. 



