.552 



H. B. GUPPY ON THE RECENT 



(c) Fine Washings (32 26), argillaceous matter and many fine mineral 

 particles. 



List of the Foraminifera contained in a Specimen of the Soft Foraminiferous 



Rock above described. 



Miliolina oblonga (rare). 

 Textularia turris (few). 



„ concava (few). 



Gaudryina rugosa (few). 

 Clavulina communis (few). 

 Vaginulina bruckenthali (rare). 

 Bolivina punctata (many). 

 ,, banktkeniana (many). 

 „ subangularis (few). 

 Bulimina inflata (rare). 



„ affinis (many). 



Nodosaria filiformis (rare). 

 Frondicularia insequalis (rare). 

 ,, interrupta (rare). 



Cristellaria articulata (rare). 

 ,, crassa (several). 

 ,, calcar (several). 

 ,, latifrons (several). 

 ,, aculeata (several). 

 Uvigerina pygmaea (rare). 

 ,, schwageri (many). 



Sagrina columellaris (many). 

 „ virgula (many). 

 ,, striata (many). 

 Truncatulina lobatula (many). 



„ rostrata (very common). 



,, haidingeii (few). 



Globigerina bulloides (many). 



,, ,, var. triloba (common). 



„ rubra (many). 



,, dubia (few). 



,, asquilateralis (few). 



„ (orbulina) uni versa (few). 



Pullenia sphaeroides (rare). 

 Planorbulina larvata (rare). 

 Pulvinulina menardii (many). 

 ,, repanda (few). 



„ elegans (few). 



Rotalia soldanii (few). 

 Amphistegina iessonii (rare). 

 Nonionina umbilicatula (rare). 



In some localities this deposit becomes highly fossiliferous, when it generally 

 assumes the character of a compact mottled grey limestone, and displays to the 

 eye fragments of corals with Pteropod and Lamellibranchiate shells, &c. Inter- 

 bedded with the softer rock, and offering a greater resistance to the action of 

 water, its position is often marked by waterfalls in the stream-courses ; but it 

 is absent from the higher parts of the streams and from the central districts of 

 the island. The following are the characters of this harder rock : — 



A compact fossiliferous limestone, containing a good deal of volcanic de'bris, 

 and probably formed in shallower water than the friable rock just described. 



Carbonate of Calcium. — About 60 per cent., consists of fragments of 

 Lamellibranchiate shells, coral, calcareous Algse ; and the following Foramini- 

 fera : — Carpenteria, Globigerina bidloides, Polytrema rubra, Truncatulina, 

 Lagena, Nummulina, and Cristellaria. 



Residue, 40 per cent., consists of — 



(a) Minerals (15 per cent,), felspar, magnetite, augite, hornblende, and 



glassy fragments. 



(b) Siliceous Organisms, none noticed. 



(c) Fine Washings (25 per cent.), consisting of argillaceous matter and 



fine mineral particles. 

 The softer friable deposit is alone found in the elevated interior of the 

 island, where it is exposed in a line of inland cliffs 300 feet in height, lying 



