514 MR. F. CHAPMAN ON MICROZOA FROM THE 



38. MiCRozoA from the Phosphatic Chalk of Taplow. By F. 

 Chapman, Esq., F.R.M.S. (Communicated by Prof. T.Rupert 

 Jones, F.R.S., F.G.S. Read June 22nd, 1892.) 



[Plate XV.] 



The present paper is the result of an examination of some material 

 kindly sent me by Mr. Llewellyn Treacher, who obtained it from 

 about the middle of the phosphatic band at Taplow. 



A short list of the foramiriifera of the Taplow Chalk has already 

 been given by A. Strahan, Esq., M.A., F.G.S., of H.M. Geological 

 Survey, with the assistance of Prof. T. Rupert Jones, F.R.S.-, F.G.S.,^ 

 and I wish at this point to express my obligation to the latter for 

 help and advice in preparing these notes. 



The material used was excessively rich in well-preserved specimens 

 of foraminifera, forming perhaps 75 per cent, of the whole ; and 

 a series selected from it proving so extensive and interesting, there 

 seemed good cause to communicate a list of them. 



On treating the disintegrated chalk with a weak solution of 

 hydrochloric acid, the most perfect casts in phosphate of lime are 

 obtained, the Rotaline forms being especially noteworthy. 



The total number of species and varieties of foraminifera found is 

 98 ; and to these must be added 5 species and varieties of ostracoda, 

 represented by 11 specimens. 



All the forms of ostracoda herein noted have been previously 

 found in the Chalk. They are : — Pontocyjpris triquetra, Jones, sp., 

 2 specimens ; Bythocypris silicula, Jones, sp., 1 specimen ; Cyihereis 

 auriculata, Cornuel, sp., 1 specimen ; G. Wrightii, Jones and Hinde, 

 6 specimens ; and Oytherella Williamsoniana^ var. granulosa, Jones, 

 1 specimen. 



Of the 98 varieties of foraminifera, 5 appear to be entirely new 

 to science, whilst altogether 30 are new to the Chalk fauna, and 

 these are marked on the list by an asterisk. Of those new to the 

 Chalk, 2 have been known from recent deposits only, namely, 

 Bulimina elegans, D'Orb., and Cristellaria gemmata, Brady. 



Of the remainder, 20 are recorded from the Tertiaries, and the 

 rest from deposits older than the Chalk. 



The following descriptions relate to those forms which are appa- 

 rently new to science : — 



(i) Nuhecularia Jonesiana, sp. no v. PI. XV. fig. 2. 



Test porcellanous, free, consisting of a single flask-shaped chamber 

 with a simple circular aperture ; the surface of the test uneven and 



^ Quart. Journ. Geol. Soc. vol. xlvii. (1891) p, 357. The forms mentionsd in 

 this earlier list are included in that given at the end of the present paper, with 

 the exception of Glohigerina Linnceana, which I have not met with. 



