CARBONIFEROUS FOSSILS. 381 



so as to show the inner portions of the septa, these are found 

 to be scarcely more undulated than in the F. cylindrical; but 

 there is no plain central space, the small median fissure being 

 merely a linear perforation on the wavy surface. The outer 

 portion of the septa, on the contrary, is excessively waved, so 

 much so that the forward bends of two contiguous undulations 

 often touch (fig. 3), and even coalesce and form a reticulate 

 tissue. And in accordance with this, a longitudinal (i. e. spiral) 

 section (\b] shows the inner portion of the septa slightly curved 

 and simple, while the outer and larger portion is deeply waved, 

 and often (from a section of the extreme undulation) appa- 

 rently branched. The septa, too, in the outer whorls are evi- 

 dently more undulated than those of the inner ones, and 

 towards the obtuse ends of the shell they are probably a good 

 deal twisted, as the reticulate tissue there is complicated and 

 confused in the sections. 



Fig. 1, natural size ; 1 a, slightly magnified a weathered 

 specimen, showing the slightly undulated inner septa; 2, a 

 portion of these magnified ; 1 b, a cross section (longitudinal) , 

 with four or five conspicuous whorls, and one or two obscure 

 central ones ; 3, a rough section, magnified, of two of the 

 outer chambers, with their highly undulated septa. 



LOCALITY. In loose blocks at Depot Point, Albert Laud ; 

 gregarious. 



STYLASTREA INCONFERTA (Lonsdale). 



Plate XXXVL, fig. 4. 

 SYN. Lonsd. in Geol. Euss. vol. i. 621 ; pi. A, fig. 2. 



At first sight this fossil, of which there are numerous exam- 

 ples in Sir E. Belcher's collection, looks so like the common 

 S. (Lithostrotiori) basaltiforme that it would be readily mis- 

 taken for one of its varieties. On comparing it, however, 

 with specimens from Kendal, which have the same general 

 internal structure, it is found to differ considerably "in the 

 greater dimensions of the columns, in the more open structure 

 of the interior, and in the centre being much less occupied by 

 prolongations of the lamellae." In these respects it agrees 



