56 
I 
% 
network to form flattened sub-palmate expansions. Corallites small, crowded, with thin walls ; 
the calices sub-triangular, or, when worn, markedly triangular, with the point of the triangle 
directed downwards ; about three in the space of one line measured either diagonally or ver- 
tically. The long diameter of the calices is about one-fourth of a line, and the interspaces 
between them are about half as much. (Fig. 14, 0.) 
A. Billingsi is allied to A. ramu- 
losa, but is distinguished by the larger 
size of the stems, the dichotomous mode 
of division, the more open network, 
and the larger size of the corallites, 
From A. labiosa it is distinguished by 
its reticulated form and closer coral- 
lites, 
7 Locality and Formation.—Not very 
mi vare in the Corniferous Limestone of 
zs‘ Port Colborne and Lot 6, Con. 1, 
Wainfleet. . 
—— 
SS 
SS 
SYS 
Fie, 14. 
a Fragment of Alveolites rawmulosa (Nich.), of the natural size. b 
Portion of the same, enlarged. c Fragment of <Alveolites Billingsi 
(Nich.), of the natural size. Corniferous Limestone. 
64. ALVEOLITES SELWynNir (Nicholson). 
(Plate VII. Fig. 4.) 
Alveolites Selwynti (Nicholson), Geological Magazine, Jan., 1874. 
Corallum forming an irregularly shaped crust or depressed mass about a line in thick- 
ness, The corallites are extremely oblique to the surface, and open by calices which have the 
form of curved or lunate slits, the length of which is about three quarters of a line, whilst 
their width is only about a tenth of a line in the centre. The calices are placed in irregu- 
larly alternating rows, or sometimes in an indistinctly sub-spiral manner, and are about 
half a line or three quarters of a line apart. 
This curious form belongs to the same section of 
Alveolites as A. sub-orbrcularis, (am.) A. Goldfussi, (Bil- . 
lings), and 4. depressw (Edwards and Haime). It is 
distinguished by the remote, curved, fissure-like cali- 
ces, with nearly parallel walls, and by the absence of 
any distinct concentric arrangement of the corallites, 
In the shape of the calices it somewhat resembles 
Cenites labrosus (Kdwards and Haime), but it, is in 
reality totally different both in its general form and in 
its real structure. 
Fig. 15. I have only seen a single example of the species. 
A fragment of the upper surface of the Alveo- [tis dedicated to Alfred R. C. Selwyn, Esq., F. G. S., 
lites Selwynii (Nich )., enlarged. Cofniferous Lime- 
stone. the Director of the Geological Survey of Canada. 
Locality and Formation.—Corniferous Limestone, Port Colborne. 
65. ALVEOLITES GoLDFUSSI (Billings)! 
Alveolites Goldfussi (Billings), Canadian Journal, New Series, Vol. V. p. 255, Fig. 5. 
Corallum forming irregular undulated expansions, or depressed discoidal masses, several 
inches in width and from two lines up to two inches in thickness. Under surface covered 
with a thin concentrically-wrinkled epitheca, similar in every respect to that of a Favosites. 
