s 60 “ 
The genus Chetetes is nearly allied to Favosites, but is separated by the absence of mural 
pores. Very similar in all essential respects to Chetetes is the genus Stenopora, of Lonsdale, 
the differential character of which is stated to be the presence of minute styliform processes 
at the angles of the calices. Good authorities, however, reject the genus Stenopora altogether, 
and refer the forms placed here partly to /avosites and partly to Chetetes.. Lastly, the genus 
Monticulipora has been founded by D’Orbigny to include species of Chitetes which increase 
by gemmation, instead of fissiparously, as is ordinarily the case in the genus. 
In the present state of our knowledge, it seems almost impossible to separate these three 
genera ; or, at any rate, it is certainly often impossible, after the most careful examination 
and comparison, to decide positively to which one of them a given specimen belongs. In the 
Hamilton Formation of Western Ontario occur three small corals which are certainly referable 
to one or other of these three genera, and which I shall provisionally consider as belonging 
to the genus Chitetes. All three I have been unable to identify with previously described 
forms ; and I have, therefore, been compelled, though with great reluctance, to consider them 
as new. 
70. CHATETES MONILIFORMIS (Nicholson). 
Chetetes moniliformis (Nicholson), Geological Magazine, Feb., 1874. 
Corallum ramose, the branches having a diameter of from three to five lines. Coraillites 
polygonal, with thin walls, for the most part nearly equal in size,-but having a few very small 
ones intercalated amongst the larger ones. The surface exhibits rounded eminences 
(‘‘mamelons’’) placed at distances of rather more than a line, over which the calices are larger 
than in the intervals between them. About four calices in the space of one line. At each 
of the angles of each calice is a minute nodular thickening, which gives a peculiar beaded 
appearance to the surface, but which is not prolonged inwards into the interior of the corallite 
in the form of a spine. On the contrary, well preserved specimens show that these bead-like 
or moniliform thickenings of the angles of the calices are continued above the general surface 
in the form of short, blunt spines, which communicate to the coral a roughness readily per- 
ceptible to the touch. Y 
Chetetes moniliformis appears to be readily distinguished from 
previously recorded examples of the genera Chitetes, Monticulipora, 
and Stenopora, by the moniliform thickenings of the angles of the 
calices and the spiniform surface-projections therefrom proceed- 
ing (fig. 17,5). The walls of the calicesare thin, and are themselves 
destitute of spines or tubercles, the spines exclusively proceeding 
from the points where the angles of contiguous calices come to- 
gether. Stenopora spinigera (Lonsdale) carries spines, as its name 
implies, but these are borne by the walls of the calices all round, 
and the other characters of the fossil are different. Stenopora 
exilis (Dawson), from the Carboniferous Rocks of Nova Scotia, 
b also possesses spines, but these likewise spring from the margins 
of the calices, are much more numerous than in the present species, 
Shite and are different in form and arrangement, whilst the calices are 
1. Fraement of Chertetes taoniz. OV instead of being polygonal, and the entire coral 1s of a more 
formis (Nich.), enlarged ; b.a por- Slender and branching habit. In addition to its peculiar spines, 
further calateed: oa recta etre Cheetetes moniliformis, is further characterised by the compara- 
suriace of CheetetesBarrandi(Nich.), tively large size of the calices, their thin walls, their polygonal 
Fee ap teed: Brom the Hamil: form and (with the exception of those occupying the “ mamelons’’) 
ton group. ’ p pytng 
their nearly equal dimensions. " 
Locality and Formation.—Rare in the Hamilton group of Widder, Township of Bosan- 
quet, 
; 71. ComretEs Barranpi (Nicholson). 
Chetetes Barrandi (Nicholson), Geological Magazine, Feb., 1874. 
Corallum ramose, or forming small lobate masses, with a diameter of from two to five 
lines, Corallites polygonal, nearly equal, though with some smaller ones intercalated amongst 
the larger ones, with thin walls. The surface does not exhibit distinct eminences, but here 
