58 



The width of these expansions appears never to have been over an inch and a quarter, often 

 less, and the thickness rarely exceeds two lines, but the height is unknown, and certainly ex- 

 ceeded two inches in some (probably in many) cases. The corallites spring from the median 

 plane of the frond on both sides, are very oblique to the surface, and have very thick walls. 

 The calices are small, transversely oval, or sub-triangular, arranged in oblique lines, their long 

 diameter being not more than from one-fourth to one-third of a line, with a transverse diame- 

 ter one-half less. The inferior lip of the calice is thin and prominent, but there are no traces 

 of any internal ridge or tooth. The calices are separated by intervals of about one-third of a 

 line in the vertical direction of the frond, and one-fourth of a line or less in the transverse 

 direction of the frond. There can be no question as to the entire distinctness of this not 



uncommon species. It is readily distinguished 

 from all other species of the genus except A. 

 Fischer i, Billings, by its peculiar form and mode 

 of growth, and it is separated from this by the 

 very much smaller size of the corallites, and 

 their much closer arrangement. The only re- 

 maining species which has been recorded from 

 the Devonian rocks of Canada is A. squamosa 

 (Billings), but a reference to the subjoined de- 

 scription will show the entire distinctness of 

 this from A. frondosa. "This species" (.4. 

 squamosa) "is found in wide, flat, irregular 

 expansions, sometimes six or seven inches in 

 breadth, and from half an inch- to one inch and 

 a half in thickness ; composed of successive, and 

 a often much distorted, layers, the cells opening 

 out upon the surface very obliquely, and sepa- 

 rated /rom one another by exceedingly thin par- 

 titions, which, when silicified and well brought 

 Fig . 16> out by the action of the weather, present a pe- 



n culiarly rough squamose appearance. The cells 



Portion of the frond of Alveolites frondosa [Nicholson]. ,. J & . ^ , rjr , lr> ,. 



a Fragment of the same magnified.' From the Hamilton are linear, in general about halt a line ID 



formation. length, and apparently about one-tenth of a 



line in width. One of the specimens examined exhibits two spots, one-fourth of an inch wide 

 each, where the cells are less than half the average size. There are obscure indications of a 

 central ridge on one side of the cell in this species, as there is in A. sub-orbicularis." (Bil- 

 ings, Can. Jour., New Ser., Vol. V., p. 257.) 



From the above description, it is obvious that A. squamosa belongs to the same natural 

 group of Alveolites as A. Goldfussi, A. sub-orbicularis A. Labechei, and A. Grayi. On the other 

 hand A. frondosa agrees with A. Fischeri in the fact that the corallum had the form of a flat- 

 tened expansion, which was attached below to some foreign object by a strong foot-stalk, and 

 which carried the corallites on both sides. Whilst agreeing in this respect with A. Fischeri, 

 the present species is nevertheless readily distinguished by the dimensions of the corallites. 



Locality and Formation. -Common in the Hamilton Formation at Bartlett's Mills, near 

 Arkona, in the Township of Bosanquet. 



Genus STRIATOPORA (Hall). 



" Ramose, coralla solid ; stems composed of angular cells ; apertures of cells opening upon 

 the surface into expanded angular cup-like depressions ; interior of the cell rayed or striated ; 

 striae extending beyond the aperture of the cell." (Hall, Pal. New York, Vol. II. p. 156). 



As regards the typical species of this genus, viz. : S. flexuosa (Hall), from the Niagara 

 group, some doubt has obtained as to its Coalenterate character, and it has been referred to the 

 class of the Polyzoa. There is, however, no doubt as to its being a true coral. One species 

 of the genus, viz. : S. Linneana (Billirgs) has been recorded from the Devonian Rocks of 

 Canada, and the close relationship between this and the ramose species of Favosites is obvious. 

 Professor Hall has also recorded a species of the genus from the Hamilton group of Iowa, 

 (viz. : Striatopora rugosa, Hall, Geology of Iowa, Vol. I., Part 2, p. 479, Plate I. Fig. 6), 



