53 
corallite is free for acertain space, and is not overlapped by the corallite below, whereas in 
Favosites the walls of the corallites are contiguous throughout, and are nowhere free. I haye 
dedicated the species to my distinguished colleague, Professor H. J. Chapman. 
Locality and Formation.—Not uncommon in the Corniferous Limestone of Port Col- 
borne, and Lot 6, Con. 1, Wainfleet. 
Genus ALVEOLITES (Lamarck). 
Corallum dendroid, massive, or encrusting ; composed of short, prismatic or cylindrical 
corallites, with inseparably united walls, often arranged in superimposed concentric layers. 
Tabule complete. Mural pores few in number. Calices oblique to the surface, sub-triangu- 
lar or crescentic, the lower lip most prominent. Septa absent, or represented by from one to 
three vertical toothlike projections. 
The genus Alveolites is very nearly allied to Favosites, but is distinguished by the much 
greater shortness of the corallites, the common presence of one or more toothlike ridges repre- 
senting the septa, and the oblique calice with its sub-triangular, crescentic, or semi-circular 
aperture and prominent lower lip. In the obliquity of the calice, however, Favosites Chap- 
mani closely approaches Alveolites. From Chetetes and Stenopora, again, the genus Alveolites 
is distinguithed by the possession of mural pores, and, as a general rule, by the much greater 
thickness of the walls of the corallites. As in the genus Favosites the species of Alveolites 
may be divided into massive and ramose forms; but some of the former are truly encrusting, 
and simply become massive by the superposition with advancing age of successive concentric 
layers of corallites. 
Mr. Billings records two species of A/veolites as occuring in the Corniferous Limestone 
_-of Western Ontario, and four species from the Hamilton formation of the same region. All 
of these except 4. squamosa, have come under my notice, and two of the Hamilton species 
(viz. 4. Remeri, and A. Fischeri,) I have also detected in the Corniferous. I have likewise 
to add five species from the Corniferous Limestone, which appear to be altogether new, to- 
gether with a single undescribed form from the Hamilton group. 
57, ALVEOLITES LABIOSA (Billings). 
Alveolites labiosa (Billings), Canadian Journal, New Series, Vol. IV. p.114, Figs. 14, 15. 
Corallum ramose, or sometimes sub-palmate, the stems cylindrical or sub-cylindrical, 
branching at intervals of from a quarter of an inch to half an inch, generally at angles of from 
60° to 70°, but not anastomosing or forming network Diameter of the stems from a little 
over a line to two lines. Corallites oblique, oval or sub-triangular, with a projecting lower lip. 
Calices transversely oval, or triangular when worn, with the apex of the triangle directed 
downwards. Calices distant from one another from a third to half a line measured verti- 
cally, and from a fourth of a line td a third of a line measured diagonally or transversely. 
Longest diameter of the calices, when unworn, about a fourth or a fifth of a line. 
Sections of this species present a close 
resembles to 4/veolites vermicularis (McCoy), 
(see Milne Edwards and Haime, British 
Fossil Corals, Plate 48, Fig. 5), but the 
branching takes place at more acute angles 
in the present form, no interlacing of the 
stems seems to occur, and the corallites, 
though somewhat curved, are not flexuous. 
In one specimen which may perhaps be a 
variety of A. dabiosa, the interior of each 
Fig. 12. corallite exhibits on, the upper wall, on one 
a. Fragment of Alveolites eryptodens, (Billings); natural size. D. side, a single strong septal ridge, dividing the 
Fragment of Alveolites labiosa, (Billings); natural size. c. Frag- calice vertically into two communicating 
ments of Alveolites conferta, (Nicholson) ; natural size. All from 
the Corniferous Limestone. ° compartments. 
Locality and Formation.—Abundant everywhere in the Corniferous limestone of Western 
‘Ontario. 
