E. J. L. Guppij — Rocli-honngs, Trinidad. 195 



FOKAMINIFERA.i 



I deal in greater detail with the fossils of this group, as they 

 present determinable specimens belonging to known forms. 



Clavulina (Haplostiche) Soldanii, Parker & Jones. 

 (PI. IX, Fig. 1.) 



This species is numerous at all depths, but especially at 150 and 250 

 feet. It does not occur in the Naparima (oceanic) beds, but I have 

 examples from the Dilrnim-h&di of Pointapier, which I originally 

 identified as Clavulina cijUndrica. The length of the longest example 

 from the Sangregrande boring is 3 mm., its breadth being 1mm.; 

 the stoutest example is 2-5 mm. long by 1-5 mm. in diameter. 

 There are many smaller examples of varying forms. 



Reophax scorpiukus, Montf. (PI. IX, Fig. 2.) 



This is I'Ot quite as common as E. {CI.) Soldanii, but is nevertheless 

 fairly abundant in some samples. It has not hitherto been met with 

 by me in any of the other Microzoic rocks of Trinidad. It is usually 

 about 2 mm. in length. 



AmodisCus incertus, Orb. 

 A single specimen somewhat like that figured in Ann. Nat. Hist., 

 vol. iv (1869), pi. xiii, figs. 3a, b. 



Cyclamina cancellata, Brady, var. deformis, nov. (PI. IX, Fig. 3.) 



Most specimens of this form are distorted by a sudden change in 

 the axis of growth of the last whorl, whereby the shell acquires a sort 

 of humpbacked appearance. It is often very thin, seldom indeed as 

 thick as the forms found abundantly in some of the Naparima 

 oceanic beds. It is one of the lai-gest Foraminifera in the 

 Sangregrande boring, being mostly 3 mm. in diameter, and occurs at 

 all depths in the boring. 



MiLioLiNA MACiLENTA, Brady. (PI. IX, Fig. 4.) 

 Diameter 1-0 mm. 



MiLioLiNA SEMiNULUM, Linne. 

 Diameter 2 mm. 



Spiroloculina tenuiseptata, Brady. (PI. IX, Fig. 5.) 



Longest diameter 1*0 mm. It is questionable if this is distinct 

 from Sp. limhata, Orb. 



BOLIVINA PUNCTATA, Orb. 



Minute Bolivinm are as abundant in this rock as in most of the 

 Microzoic formations of the island. 



' Plates VIII aud IX, illustratiug- the Foramiuifera, ^\\\ appear iu the concluding, 

 pai't of Mr. Guppy's paper. 



