32 ART. 5. — H. YABE. 



Ill) Kotch-jyang-kol/^ west of the Sam-deung-^ coal-field 

 (coll. by Iki). 



The limestone is extremely light coloured, with numerous 

 small pullets of rather irregular form and size. Among the 

 pullets are found numerous minute shells of Foraminifera, some 

 of which probably belong to the young of Fusulina. 



A similar rock is also reported by Iki and Fukuchi as 

 exposed near Mun-syu-bong. There is a limestone kilne, situated 

 at the northern foot of Mu-no-san. 



The geological age of this limestone is surely Anthracolitic, 

 ])ut to what part of it the rock belongs, is impossible to say. 



DESCRIPTION. 



FUSULINA sp. indet. 

 PI. TIL, figs. 4 and 5. 



Fig. 5, PI. III. shows a transverse (slightly oblique) section 

 of a Fusulina through its first chamber ; it is the best I have 

 ever seen in the thin slices of Korean limestone. This Fusulina 

 is very small in size, with about four volutions, and attaining 

 only 1.0 mm. in diam.; the volutions increase regularly and at 

 the same time gradually in height, though tliey are not so 

 closely coiled as in F, japonica Guembel. The rate of growth 

 of each volution is to be estimated as follows,-x-, x, x, 7, 9, 12, 



14, 18, 20, , the first three figures showing dimensions not 



capable of being measured with any accuracy. The walls are 

 1) mn 2) H|5 



