Marshall. — The Toiinger Limestones of New Zealand. 93 



stegina. A small quantity of glauconite and one or two grains of foreign 

 rock. This rock closely resembles the limestones from Waiomio and 

 Whangarei described above. 



{n.) Mokau, Taranaki. Plate IX, fig. 1. 



The specimen that I have consists mainly of Amphistegina of relatively 

 large size, 2-5 mm. in diameter. In many of the individuals the canal 

 system is most distinctly seen, because all the minute canals are filled with 

 glauconite, as well as some of the chambers. A few Operculina are also 

 present, as well as an occasional Spiroplecta. Very few Polyzoa and echino- 

 derm plates. Lithothamnium is quite abundant. A little quartz and some 

 shell fragments. 



B. FORAMINIFERAL LIMESTONES. 



(«.) Raglan, West Auckland. 



Globigerina abundant, but larger individuals than in the true oozes of 

 New Zealand. One large Cristellaria. Rotalia and Trmicatulina not fre- 

 quent. No glauconite and no detrital grains. Much of the material of the 

 rock is extremely fine-grained calcite that shows no distinct characters. 

 Mr. Chapman says, " This is a deeper-water type than the Milburn rock, 

 and was formed at a fair distance from the shore-line." 



(6.) Waitetima, near Raglan. 



Not greatly different from the above, but it contains Bolivina as well as 

 Globigerina, a fragment of a shell, and a small polyzoan. A small piece of 

 brown hydrous mica. Many slender rods, probably calcified sponge-spicules. 



(c.) Cobden, Greymouth, Westland. 



A relatively fine-grained type, which shows an approach to Globigerina 

 ooze. Most of the tests of Globigerina are broken. Small Truncatulina and 

 Rotalia Some carbonaceous matter and brown hydrous mica. A few small 

 quartz grains and some glauconite. Numerous slender rods that may be 

 calcified sponge-spicules. 



(d.) Te Kuiti, South Auckland. 



Very similar to the Raglan types, but containing several small fragments 

 of Polyzoa. Globigerina, Truncatulina, and Rotalia are abundant. The in- 

 ternal cavities of the tests are filled with calcite. 



[e.) Sandymount, Dunedin. 



Globigerina is the most abundant organism, and the cavities of the tests 

 are filled with crystalline calcite. Truncatidina and Spiroplecta occur as well. 

 A small amount of carbonaceous matter is present, and there are some quartz 

 grains. 



(/.) Milburn, South Otago. Plate X, fig. 1. 



Remains of Polyzoa few and inconspicuous. Echinoderm plates fairly 

 frequent, but thin and small material. Foraminijera rather abundant, but 

 small. Globigerina, Rotalia, and Spiroplecta are the most frequent. A few 

 grains of quartz and some glauconite. Mr. Chapman says, " The Milburn 

 limestone is of moderately deep-water origin, and resembles some of our 

 Miocene foraminiferal marls." 



