300 
Aug. F. Foerste 
of the Richmond. The specimen described by James was obtained 
in the Orthoceras fosteri zone, at the base of the Clarksville division 
of the Waynesville member, at Clarksville, Ohio. 
The type of Alveolites granulosa, figured in this Bulletin, is 
preserved in the James collection, at Chicago University, and is 
numbered 2250. It is not desired in this publication to revive 
the name used by James, in preference to Stromatocerium huronense, 
now generally accepted, but merely to offer a good illustration of 
the James type. 
The interior structure of Alveolites granulosa is well presented 
by Prof. W. A. Parks (loc. cit. pi. 22, figs. 6, 10), and he figures also 
a second specimen from identically the same locality and horizon 
as this type (pi. 22, figs. 5, 8, 9). The specimen figured by Nichol- 
son under the name Lahechia ohioensis was obtained at Wa 5 niesville, 
Ohio, probably from the same part of the Waynesville member 
as the type of Alveolites granulosa. The structure of this species, 
therefore, may be said to be well known. 
Under an ordinary magnifier, the type of Alveolites granulosa 
presents the appearance of a succession of papillose layers resting 
upon variable thicknesses of intermediate vesiculose tissue penetrated 
by vertical pillars. Frequently, on the weathered lateral surface 
of the specimen, the vertical pillars appear laminar, rather than 
filiform, and the vesiculose tissue presents the appearance of trans- 
verse tabulae crossing the interior of narrow corallites. That this 
appearance is deceptive is shown by the transverse sections. The 
pillars usually grow in fascicles, each fascicle giving rise at the sur- 
face to a distinct mamelon, the pillars of the same fascicle spreading 
upward and outward from the center of the fascicle toward the sur- 
face of one of the mamellate elevations. Since the mamellate ele- 
vations of successive plates are not necessarily directly over each 
other, the spreading of these fascicles of vertical lamellse at times is 
very irregular, those of different layers being inclined at different 
angles. In the original description by James this structure was 
noted in the following terms: “In some cases groups of corallites seem 
to radiate from different points or axes, and weathered sections 
show them as growing at various angles in the mass, shorter and 
longer and curving in different directions. It should be noted 
that this fasciculate structure is shown by vertical weathered sec- 
tions, and that no reference is made here to the radiate arrangement 
