359 



Another specimen is four inches in length, and broken off at both 

 extremities. Its diameter in the middle is about twenty lines, and at the 

 upper extremity three inches. It appears to be lobed at the upper end 

 as is the one above figured. The exterior to the depth of three lines has 

 an obscurely concentric lamellar structure. The interior, as exhibited in 

 the fracture of the large end, is a poriferous mass two inches across. 

 The pores are rudely circular, from one-fourth of a line to one line in 

 width, and about the same distances apart from each other. The fossil 

 itself is composed of a whitish chert, and it is imbedded in dark-brown 

 magnesian limestone. This dark-brown rock is injected into the pores, 

 and defines them very distinctly. The external lamellar portion is per- 

 forated in a radial direction by small canals about half-a-line in diameter, 

 as shown in one place ; but in another place they seem to be much 

 smaller. The central poriferous mass seems to be irregularly reticulated 

 by the canals. 



Judging from these two specimens this species appears to be a sub- 

 turbinate form, which at the height of several inches produced several 

 others by a budding process. It is referred to the genus Calathimn 

 provisionally. 



Locality and Formation. — Mingan Islands ; Calciferous formation. 



Collectors. — Sir W. E. Logan, J. Richardson. 



Receptaculites calciferus. (JST. sp.) 



Fig. 34C. 



Fig. 347. 



Fig. 346.— Receptaculites calciferus. A fragment of the inner surface of the eclorhin. 

 " 347. — R. ? elcgantulus. A cast of the inside. 



Description. — The specimen (fig. 346) is a fragment of the lower side, 

 showing the inner surface of the ectorhin with the radial and cychcal 

 stolons preserved. It resembles B. occidentalis (Salter), but differs in 

 having the stolons of a somewhat greater length. This perhaps would not 

 be sufficient to separate the species, but as the one is only known in the 

 Calciferous, and the other in the Black River Umestone, the whole of the 

 Chazy intervening, it is most probable that they are distinct. 



