38 
the other, the younger upon the older. As the direction of the new cups does hot always 
accord with that of the old ones, the general form produced by this mode of increase is often 
very peculiar and irregular. Some specimens also show extraordinary lateral prolongations of 
the epitheca. 
In many respects, C. vesiculosum resembles C. Senecaense-and C. grande, but it is on an 
average larger than the former and smaller than the latter. It is also distinguished by its 
mode of increase, the disposition of its cells, its very deep calice, and its surface-characters. 
From C. Americanum it is distinguished by its larger size, more turbinate form, larger 
calice, and wrinkled epitheca. 
Locality and Formation.—Rare in the Corniferous Limestone of Port Colborne and 
Hagersville. Very abundant in the Hamilton Formation of Bartlett’s Mills, near Arkona, 
Township of Bosanquet. f 
35. CYSTIPHYLLUM sULCATUM (Billings). 
(Plate VI. Fig. 7). 
Cystiphyllum sulcatum (Billings), Canadian Jourial, New Series, Vol. IV. p. 136. 
& 
“ Corallum simple, short, turbinate, much curved, expanding at the rate of between forty 
and forty-five degrees from the minute sharp curved point upwards; cup oblique, the lower 
margin being on the side of the lesser curvature, moderately deep, and nearly regularly con- 
cave, the bottom covered with obscure coarse rounded radiating ridges; a shallow rounded 
groove or fossette extending from the centre to the higher margin, and in some specimens two 
others much less distinct, radiating to the sides at right angles to the main groove. Exterior 
encircled by obscure undulations, and longitudinally striated by the rudimentary radiating 
septa. The vesicular structure consists of irregular sub lenticular cells, from half a line to two 
lines in width ; length of the convex side, from one inch and a half to three inches ; the usual 
length appears to be about two inches or a little more ; width of cup from one inch to one inch: 
and a half; depth about half an inch” (Billings). 
This pretty little species, in its external appearance, presents a close resemblance at first 
sight to small specimens of Zaphrentis prolifica (Billings,) from which, of course, its internal 
structure separates it at once. The epitheca is tolerably thick, and exhibits with unusual 
distinctness the vertical ridges which mark the position of the septa, along with numerous 
rounded annulations and folds of growth, these latter being sometimes obscure. C. sulcatum 
can readily be distinguished from all other species of the genus by its general form, its surface- 
characters, the great obliquity of the calice and the fossular furrow. 
Locality and Formation.—Corniferous Limestone, Rama’s Farm, Port Colborne. 
Genus Microcycius (Meek and Worthen). 
“ Corallum free or with a minute central point of attachthent, discoidal, without colum- 
ella; calice very shallow or nearly obsolete, and provided with a single small fossette; septa 
short, nearly regularly radiating, or with a few of those nearest the fossette converging a little 
towards its sides ; epitheca well developed. 
« This little coral seems to be nearly related to Combophyllum and Baryphyllum, (Hd: 
wards and Haime), but differs from the first in having a well-developed epitheca, and from the 
latter, not only in that character, but in having its fossette simple, and its costa nearly regu- 
larly radiating. It also presents similar differences from Hadrophyllum of Edwards and 
Haime.” (Meek and Worthen, Geology of Illinois, Vol. IIT. p. 420). 
36. MicrocyoLus piscus. (Meek and Worthen). 
Microcyclus discus. (Meek and Worthen,) Geol. of Illinois, Vol. III. p. 420, Pl. XT. 
Fig. 7, a. 6. 
“‘ Corallum depressed-discoid ; periphery sharp, under side flat, and protected by the 
concentrically-wrinkled epitheca ; upper side slightly convex, flat or a little concave in the 
middle ; fossette «small, shallow, and extending from the centre to the margin. Septa very 
