120 ANNALS NEW YORK ACADEMY OF SCIENCES 



confined chiefly to the brachiopoda like so many Carboniferous faunas, 

 but presents all the zoological groups in just proportion. The greater 

 part of the fauna, as one would expect, consists of species already in the 

 literature, but a considerable number of new forms, both genera and 

 species, have been obtained. These are described below, but a report con- 

 taining descriptions and figures of the entire fauna has been completed 

 and submitted for publication as a bulletin of the United States Geo- 

 logical Survey. 



Descriptions of Genera and Species 



Protozoa 



Fusulina inconspicua sp. nov. 



Shell small, sub-cylindrical to somewhat fusiform. The average length is 

 perhaps 3 mm., with a diameter of about 1 mm., but specimens 3.5 mm. long 

 are not uncommon. A few have a length of 4 mm., while one example pro- 

 visionally referred to this species is nearly 5 mm. long and 1.5 mm. in thick- 

 ness. Different specimens vary appreciably in proportions, some being slender 

 and others more robust. As is common in this genus, young specimens are 

 relatively more slender than mature ones. For the most part, this species is 

 of very regular growth with a sub-cylindrical shape abruptly rounded at the 

 ends. Some specimens taper more distinctly than others. In general, this 

 appears to be an immature character, appearing in young sbells more than in 

 mature ones and being retained to a later stage in some than in others. 



Initial cell rather large, about .1 mm. in diameter. The largest measured 

 had a diameter of .11 mm., others .099 mm., still others .084 mm., and others 

 even smaller. It seems reasonable to infer that the initial cell varies in size 

 in different specimens, but that the smaller measurements are in many cases 

 due to the section not passing through its center. The walls are thin, the 

 septa and outer wall being nearly equal in thickness. The specimens studied 

 do not show the minute structure. In mature specimens (1 mm. in diameter) 

 five or even six revolutions of the outer wall can be counted in addition to the 

 initial cell. In a mature specimen (1 mm. in diameter) some 23 septa occur 

 in the outer volution, and this appears to be about normal. The specimens 

 examined may not show this character with accuracy, but the sutures or 

 superficial lines formed by the septa are indistinct and not depressed. They 

 are straight or nearly straight at the surface, but a little below, the septa 

 appear to become strongly plicated. 



Height of final chamber about .07 mm. or .08 mm. ; thickness of the outer 

 wall about one third to one fourth as much, or .028 mm. to .02 mm. 



This diminutive species, which occurs in great numbers at the one 

 horizon in the Wewoka formation where it is found at all, is readily dis- 

 tinguished from all other American species thus far known, by its much 



