300 AUSTRALIAN FORAMINIFBRA, II., 



Articulina chapmani n.sp. (Plate vi. figs.5rt, h). 



This is a highly ornamented species. It consists of a series of 

 chamVjers, slowly increasing in size, and ending in a smaller 

 neck-like spherical chamber with a round terminal aperture. 

 Unfortunately in the two specimens found the proximal extremity 

 was broken off. 



The test is distinctly porcellanous. Because of this character- 

 istic, as well as on account of the nodosarine arrangement of the 

 chambers and their high ornamentation, we have ascribed this 

 species to the genus Articulina. 



As regards the ornamentation, fig.5/j shows it under high 

 power. The test is slightly constricted between the chambers. 

 Each chamber bears a series of longitudinal ridges, and in eacii 

 space between these there are two rows of minute tubercles. 



Length Oo7 mm. 



Remarks. — About 30 % of the material under examination was 

 made up of foraminifera, the rest being composed of coral remains, 

 polyzoa, coralline algae, ostracods. and sponge spicules. The 

 ostracods are particularly well represented, both in species and 

 numbers. Glauconite casts are very rare. Miliolidse and JNum- 

 mulinidte constitute the main bulk of the foraminifera present. 



The occurrence of Ophthalmidium cornu and Spiroloculina 

 tortuosa in considerable numbers is interesting inasmuch as these 

 are new species described by Mr. F. Chapman in his report on 

 the " Foraminifera from the Lagoon at Funafuti."*" Polysto- 

 mella hedleiji is very abundant and characteristic. 



Bolivina is fairly well represented; other Textiilariid?e, except- 

 ing Veriieuilina, are extremely rare. 



Operculitiq, ammonoides is a very abundant form. 

 On the whole, the material is typical of coral reef conditions. 

 Globigerinidse and Lagenidse are very rare. 



* Journ. Linn. Soc. Lond. Zoology. Vol. xxviii. 



