56 



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, b.} 



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. hibiosa it is distinguished by 

 its reticulated form and closer coral- 

 lites. 



Locality and Formation.- Not very 

 rare in the Corniferous Limestone of 

 Port Colborne and Lot 6, Con. 1, 

 Wainfleet. 



FIG. 14. 



a Fragment of Alveolites ramulosa (Nich.), of the uatural size, b 

 Portion of the same, enlarged, c Fragment of Alveolites Billingsi 

 'Nich.), of the natural size. Corniferous Limestone. 



64. ALVEOLITES SELWYNII (Nicholson). 



(Plate VII. Fig. 4.) 



Alveolites Sdwynii (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 &sA. sub-orhcularis, (Lam.) A. Goldfussi, (Bil- 

 lings), and A. depressa (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 

 Ccenites labrosus (Edwards and Haime), but it is in 

 reality totally different both in its general form and in 

 its real structure. 

 Fig. is. I have only seen a single example of the species. 



A fragment of the upper surface of the Alveo- It is dedicated to Alfred R. C. Selwyn, Esq., F. Gr. S., 

 lites Selwynii (Nich )., enlarged. Corniferous Lime- ,, -p.. j xi. n i i a n J 



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. 



