Vol. 52.] FORAMINIFERA AND OSTRACODA. 471 



ostracoda are here recorded from the chalk of Southerham. The 

 ostracoda are all known from the Chalk. 



As regards the foraminifera, only 57 per cent, of the forms from 

 Southerham are found at Taplow ; and, from the evidence afforded 

 by a comparison of the two faunas, that of the Southerham chalk 

 seems to be of deeper-water origin than the one from Taplow. 



The family of the Miliolidae is represented in the Taplow chalk 

 by no less than seven species, while only a doubtful glauconite-cast 

 of a MilioUna has been collected from the Southerham chalk. 



The family of the Lituolidae is represented in the Southerham 

 chalk by two species of Haplophragmium, the Taplow chalk yielding 

 no example. 



The next family — the Textulariidse — is one of the best repre- 

 sented in the Southerham chalk, and comprises Textularia (3 forms), 

 Tritaxia (3), Spirophcta (1), Gaudryina (3), and Bulimina (5). 

 The species are represented in the Taplow chalk, with the excep- 

 tions of Tritaxia pyramidata, Reuss (also abundant in the Chalk 

 Marl and Gault), Gaudryina pupoides, d'Orb., Bulimina polystropha, 

 Reuss, and B. pupoides, d'Orb. The siphonate Tritaxia, T. foveo- 

 lata, Marsson, was also found in the Taplow chalk, but not recorded, 

 and I am indebted to Mr. F. W. Millett for directing my attention 

 to its occurrence there. 



The family of the Lagenidse, while it is fairly well represented 

 in the Southerham chalk by some genera, is conspicuously poor in 

 those having delicate tests such as Lagena, Lingulina, Frondicularia, 

 and Polymorphina, all of which are recorded from the Taplow chalk. 

 It is possible that examples of genera such as these may have been 

 destroyed by subsequent disturbances of the deposit ; but it is, 

 perhaps, more probable that their absence may be accounted for by 

 the bathymetrical conditions, seeing that these genera are usually 

 found in fairly shallow water. 



Of the Globigerinidae, Globigerina cequilateralis, Brady, is con- 

 spicuously rare in the Chalk of Southerham. 



The Rotaliidae are remarkably few in number, being represented 

 by five genera only, with as many species. By far the most interesting 

 form in this family from the Southerham chalk is Gypsina cretce 

 (Marsson). 1 The species is here recorded for the first time from 

 the English Chalk, and was described by Dr. Marsson from the 

 White Chalk of Riigen. 



See full lists on next page. 



In concluding these notes I wish to express my obligations to 

 Prof. J. W. Judd, C.B., LL.D., F.R.S., who very kindly gave me 

 facilities for working out these results in the Geological Laboratory 

 of the Royal College of Science. 



1 Acervulina cretce, Marsson, 1878, Mitth. Nat. Ver. Neu-Vorpommern u. 

 Biigen, vol. x. p. 171, pi. v. fig. 39 a & b. 



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