246 THE PALEONTOLOGY OF MINNESOTA. 
[Prasopora. 
perhaps only at limited points, the interspaces left between them being occupied by 
the small mesopores. These vary somewhat in number, and more so in size, but are 
always decidedly angular. At intervals they are collected into substellate macule 
of greater or less extent, and in the immediate vicinity of these the zocecia are of 
appreciably larger size than elsewhere. No evidence whatever of acanthopores has 
been detected. 
In vertical sections the cystiphragms form continuous series on one or both 
sides of the tubes, according as they extended all around the circumference or 
embraced only a portion of same, while an equal number of straight diaphragms 
crosses the remaining portion of the tube. In the Kentucky, Tennessee, and 
Minnesota form of the species the tabulation of the tubes is more uniform and 
crowded than in the Canadian and New York variety, for which the name 
orientalis is proposed. In the former the cystiphragms average sixteen or seven- 
teen in 2 mm., while in the latter the average does not exceed thirteen, and in 
some cases is not over ten in that space. In the mesopores the diaphragms are 
simple, and average about eighteen in | mm. for the typical form, and twelve for 
var. orientalis. 
Variety ORIENTALIS, 7”. var. 
PLATE XVI, FIGS. 1, 2, 6, 7. 
Monticulipora;(Diplotrypa) whiteavesi (part.) Nicholson, 1879. Pal. Tab. Corals, p. 316. 
This subordinate name is proposed for the eastern variety of the species. It is 
distinguished from the typical form by the greater extent and distinctness of the 
substellate maculw, the greater size attained by the zoccia in the immediate 
vicinity of the macule and the less compact tabulation of the zocecia and the 
mesopores. 
This species may really be the one referred to by Vanuxem in 1842 (Geol. 3d 
Dist. N. Y. p. 46), when he speaks of “The Puffball favosite (Favosites lycopodites)” 
as being highly characteristic and in great numbers in the Trenton limestone of 
New York. He adds, “it is found also in the lower part of the Utica slate, where it 
ends,” and that “it is equally abundant at Frankfort, Kentucky, where it received 
the name of T’rianisites cliffordi.” 
The name Favosites or Cheetetes lycoperdon (equivalent to Vanuxem’s Favosites 
lycopodites) is generally credited to Say, but no description of the form was ever 
published by him, and the first known of the so-called species under that name is 
