8 ART. 5— H. YABE : 



large chamber, and indeed that of Fasidina s. s. usually attains 

 a large size ; 1)nt in other subgenera the large ehauiher is of rare 

 occurrence. Thus, Schwagerina is generally taken as including 

 those forms which have a minute first chamber. Now, I go so 

 far as to question whether the size of the first chamber is in any 

 measure constant, for I have an examj^le of a Neowhwagerina 

 with a large first chamber, but quite similar to X. craticuUfera 

 in other respects (PI. I., fig. 4). 



The genus Fusulina has a very wide geographical distribution ; 

 consequently there is a considerable number of works relating to 

 its occurrence in various parts of the world, many of which are 

 not accessible to me. Moreover, it seems that not much reliance 

 can be placed u])on the statements of its occurrence, as we do not 

 know whether in all cases the specific names are used in the sense 

 taken by us. These and other circumstances render an exliaustive 

 treatment of its distribution impossible ; still we can get a general 

 survey of the genus from the following summary of the more 

 important literature of the subject. 



American Border of the Pacific. 



North America : — The distribution of Fusulina-WmeBiowQ 

 in North America is very extensive. Though Fusulina s. s. 

 seems to be common in the above region, singularly, Doliolina 

 and Neoschu'agerina are at present very little known. Of Fasu- 

 Una, especially the name of F. cylindrica Fischer in its varieties 

 is most frequently met with in the literature of the American 

 Carboniferous ; thus we find them reported from the Subcarboni- 

 ferous limestones of Colorado, Kansas, Ohio, Nebraska, Iowa, 

 Indiana, California, Wyoming, Utah, Illinois, Arizona and Britisli 



