60 



The genus Chcetetes is nearly allied to Fawsites, but is separated by the absence of mural 

 pores. Very similar in all essential respects to Chcetetes 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 Favorites and partly to Chcetetes. Lastly, the genus 

 Jfonticulipora has been founded by D'Orbigny to include species of Chcetetes 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 Chcetetes. 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. CH/ETETES MONILIFORMIS (Nicholson). 



Chcetetes moniliformis (Nicholson), Geological Magazine, Feb., 1874. 



Corallum ramose, the branches having a diameter of from three to five lines. Corallites 

 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 tlie 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. 



Chcetetes moniliformis appears to be readily distinguished from 

 previously recorded examples of the genera Chcetetes, Monticulipora, 

 and Stenopora, by the moniliform thickenings of the angles of the 

 calices and the spiniform "surface-projections therefrom proceed- 

 ing (fig. 1 7, b). The walls of the calices are 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 spinigcra (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 Hocks of Nova Scotia, 

 also possesses spines, but these likewise spring from the margins 

 of the calices, are much more numerous than in the present species, 

 and are different in form and arrangement, whilst the calices are 

 . oval instead of being polygonal, and the entire coral is of a more 



o. Fragment of Chcetetes monih- . , . , , P . i T -IT- i- 



form.is (Nich.), enlarged ; 6. a por- slender and branching habit, in addition to its peculiar spines, 



tion of the surface of the same, still />//, milifnvmi* ia fnrtViPr pTiflrapfprisiPfl Vw tViP pmnnara- 



further enlarged ; c. a portion of the L / W ^ efeS monuiJCfl miS, IS uy UK 



surfaceof cha>tetesarrandi(Nici\.), tively large size of the calices, their thin walls, their polygonal 

 fon a group! ar '" form, and (with the exception of those occupying the " mamelons" ) 



their nearly equal dimensions. 



Locality and Formation. Rare in the Hamilton group of Widder, Township of Bosan- 

 quet. 



71. CHCETETES BARRANDI (Nicholson). 



Chcetetes 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 



