246 Christmas Island. 



Carpenteria capitata, sp. hot. (PI. XX, Fig. 7.) 



Test normally adherent, of a somewhat erect habit of growth. 

 The earliest - formed chambers are narrow and somewhat like 

 those of the conical-shaped Carpentericc, and these are followed 

 by a rudely spiral series of sub-globular chambers, the walls of 

 which are thicker than those of the proximal portion. The later 

 portion of the test is externally rough, appearing coarsely notched 

 in section. This form has some affinities with Rupertia and 

 possibly SaMonia. Height J inch (6 mm.) ; greatest width -2% inch 

 (4 mm.) ; thickness of the wall of the last chambers -/u inch 

 (0-5 mm.). 



AmpMstegina lessonii, d'Orbigny. 

 This species is numerous in No. 521. 



Seterostegina depressa, d'Orbigny. 



The examples found in this limestone (521) are of extraordinary 

 dimensions and have very extensive and thin flanges. 



No. 646. Summit of Flying Fish Cove cliff ; from about the 

 same horizon as 521. A limestone largely composed of Litho- 

 thamnion, foraminifera, and echinoderm remains. 



Foraminifera : 



MilioUna alveoUniformis, Brady. Eare. 

 Planorhulina larvata, P. & J. Frequent. 

 Gypsina glolidus (Eeuss). Hare. 



Polytrema miniaceum (Pallas), var. involva, nov. (One large 

 mass intergrown with Litliothamnion.) 

 Amphistegina lessonii, d'Orb. Common. 

 Meter osteg ilia depressa, d'Orb. Frequent. 

 Orbitoides (Zepidoegclina) sumatrensis, Brady. Common. 



The next specimen, No. 550, is a whitish limestone, compact, 

 rather dense and amorphous, owing probably to the presence of 

 granules derived from calcareous algee. This is from about the 

 same horizon as 562 (p. 243). 



The organic remains constituting this rock are Litliothamnion, 

 foraminifera, echinoderm spines, polyzoa, and lamellibranch shells. 



