The Canadian journal of industry, science and art . ody-rings, &c., but possesses an oval in place of a forkedhypostoma. It is often impossible to decide, consequently, as towhich genus fragmentary examples should be referred. Under Ogygia,the Dikelocephalus of Dale Owen, and the Bathyurus of Billings,should probably be placed. Several species of these, although in amore or less imperfect condition, have been found in the Quebecgroup (see Part V.) of Point Levi, and also, as regards Bathyurus, intbe corresponding Calciferous Sand E,ock of the Mingan Islands, as wellas in the Chazy Limestone of
The Canadian journal of industry, science and art . ody-rings, &c., but possesses an oval in place of a forkedhypostoma. It is often impossible to decide, consequently, as towhich genus fragmentary examples should be referred. Under Ogygia,the Dikelocephalus of Dale Owen, and the Bathyurus of Billings,should probably be placed. Several species of these, although in amore or less imperfect condition, have been found in the Quebecgroup (see Part V.) of Point Levi, and also, as regards Bathyurus, intbe corresponding Calciferous Sand E,ock of the Mingan Islands, as wellas in the Chazy Limestone of Grenville, &c. The body-rings in the lat-ter type are perhaps nine in number, but few specimens, in which theyare complete, have as yet been metwith. Fig. 142 represents a frag-mentary example of B. Angelini)after a figure by Mr. Billings, fromthe Chazy limestone. A portionof the head-shield of B. Safordi,copied also from Billings, is shewnat a. In Dikelocephalus, the py-gidium has often a deeply serrated or spinose margin ; but it may be. Fig. 142. 30 A POPULAR EXPOSITION OF THE
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