382 CARBONIFEROUS FOSSILS. 



well with Lonsdale's description of the species from the east 

 side of the Ural ; and his figure is very like, in the size of 

 the tubes and their irregularly corrugated surface. The cross 

 section, too, agrees very well in the comparatively few (38-40) 

 lamellfe, of which only half are conspicuous, the intermediate 

 ones being exceedingly short and obscure, in the wide space 

 occupied by the central flattened tabulse, and in the loose ve- 

 sicular tissue. I do not think there is much doubt of their 

 identity. 



The British Stylastrea from Kendal has more numerous 

 lamellae (54 or 60), the intermediate ones being considerably 

 developed and only a little shorter than the rest, and the ve- 

 sicular tissue is closer and more abundant. 



Stylastrea, being without any elevation of the tabulse into a 

 crest or columella, seems to be a natural division. Professor 

 Milne Edwards is inclined to regard the absence of that organ 

 as accidental : it is, however, characteristic of the two species 

 above noticed. 



LOCALITY. Depot Point. 



There are among these Arctic corals one or two species of 

 Lithostrotion with a central axis one particularly abundant ; 

 and there is also a large Michelinea, growing to a parabolic 

 mass five or six inches high and four inches across, and with 

 the calices half an inch in diameter. 



ZAPHRENTIS OVIBOS (n. sp.). 

 Plate XXXVI., fig. 5. 



Nine to ten inches high and two in breadth, curved, some- 

 times strongly, and either gradually tapering or somewhat 

 abruptly conical at the base, and thence cylindrical, and often 

 a little contracted above. The surface is smooth, and regu- 

 larly marked by ridges of growth about half a line apart, but 

 seldom with constrictions : the calyx circular, deep, rather 

 thin-edged, with numerous (36-44, or even 60 in a large spe- 

 cimen) prominent septa extending to within the margin of the 

 smooth central tabula, which is elevated in the middle into a 

 narrow crest continuous with the primary septum, but not 



