692 Transactions of the Society. 



Polytrema Eisso. 

 207. Polytrema miniaceum Linne sp. 



Millepora miniacea Linne, 1788, Syst. Nat., 13th (Gnielin's) ed., vol. i. pt. 6. 



p. 3784, No. 6. 

 Polytrema miniacea (Linne) Carpenter, 1862, Introd. Foram., p. 235, pi. xiii. 



figs. 18-20. 

 Polytrema miniaceum (Linne) Moebius, 1880, Forarn. von Mauritius, p. 85, 



pi. vii. 

 Ditto. (Liune) Brady, 1884, Foram. ' Challenger,' p. 721, pi. c. figs. 5-9 ; pi. 



ci. fig. 1. 



We have a few fragments which can hardly be ascribed to any 

 organism other than Polytrema, especially as they preserve both the 

 colour and the typical perforate exterior rugosity of the test, but 

 in the absence of more perfect specimens, the species is recorded 

 with some reservation. The fossil records of Polytrema are very 

 confusing, owing to the superficial resemblance to a zoophyte, and 

 Brady states that little can be said with certainty as to its occur- 

 rence as a fossil. Without a re-examination of the specimens, it 

 is impossible to say how many of the fossil records belong to the 

 genus as at present constituted. 



Family X. NUMMULINIM3. 



Sub-family 2. Polystomellinae. 

 Nonionina d'Orbigny. 

 208. Nonionina depressula Walker and Jacob sp. 



Nautilus depressulus Walker and Jacob, 1798, Adam's Essays, Kanmacher's 



Edition, p. 641, pi. xiv. fig. 33. 

 Nonionina umbilicatula Williamson, 1858, Kecent Foram. Gt. Britain, p. 97, 



pi. iv. figs. 70, 71. 

 Nonionina crassula Williamson, ibid, p. 33. 

 Souionina depressula (Walker and Jacob) Brady, 1884, Foram. ' Challenger,' 



p. 725, pi. cix. figs. 6, 7. 



EXPLANATION OF PLATE XXL 



Pig. 1 (a). — Rotalia calcar d'Orbigny. Superior surface. 

 ,, (fe). — Ditto. Inferior surface. 

 „ (c). — Ditto. Side view. 



„ 2 (a). — Polystomella striato-punctata Fichtel and Moll. Selsey and Bognor 



variety, with central (umbilical) deposit. Superior surface. 

 ,, (fe). — Ditto. Inferior surface. 

 ,, (c). — Ditto. Side view. 



„ 3 (a).— Polystomella macclla Fichtel and Moll. Superior surface. 

 „ (b). — Ditto. Side view. 



,, 4 (a). — Operculina complanata Defrance. Superior surface. 

 ,, (6). — Ditto. Side view. 



All figures x 100 diarn. 



