844 DR. G J. HINDE ON RECEPTACULITID A. 
near the margins are about 5 millim. in thickness; the spicular 
plates are from 2°5 to 3 millim. in width. According to Gimbel 
the inner layer of this species is perforated by canals in a similar 
manner to that of R. occidentalis. I have only seen a single example 
of this species. It approaches closely to R. occidentalis, but the 
spicular plates and rays appear smaller. Eichwald’s figures 1 6, «, 
though stated to be of the natural size, are evidently enlarged. 
Eichwald states that Escharites forniculosus, Schlot., is a synonym 
of his species ; but as Schlotheim’s description is altogether insufficient 
to recognize the form, and is, moreover, not accompanied by any 
figure, it seems preferable to retain Kichwald’s name and authority 
for it. 
DMstribution.—Orthoceratite limestone: Odinsholm, Reval, Bal- 
tischport, Esthonia. 
RECEPTACULITES AUSTRALIS, Salter. 
1859. Receptaculites australis, Salt. Canad. Org. Rem. dec. i. 
p. 47, t. 10. f. 8-10. 
1878. Receptaculites australis, R. Etheridge, jun., Cat. Austr. 
Foss. p. 3. 
1880. Receptaculites australis, F. Romer, Leth. Pal. Th. 1, p. 290. 
According to Salter this species is mainly distinguished from R. 
occidentalis, Salt., by the imperfectly lobed surface of the spicular 
plates. Apparently the specimens, like those of R. occidentalis, are 
siliceous, and it is doubtful whether the so-called lobed surfaces of 
the plates may not be due to irregular accretions of this mineral. 
Distribution. Upper Silurian: Yarradong, New South Wales. 
RECEPTACULITES ? CANADENSIS, Billings. 
1863. Ischadites canadensis, Bill. Geol. Canada, p. 309, f. 313, 
and p. 327. 
1865. Receptaculites canadensis, Bill. Pal. Foss. Canada, vol. i, p. 
384, f. 362. 
1880. Receptaculites canadensis, F. Romer, Leth. Pal. Th. 1, 
p-. 289. 
The specimen thus named consists of only a compressed fragment 
of an individual, from which it is impracticable to determine if it 
forms part of a Receptaculites or Ischadites, and it is quite insufficient 
to furnish satisfactory specific characters. No description of it is 
given in the ‘Geology of Canada,’ where it is first figured, and the 
only apparent reference to it, on p. 327, states that it is an [schadites 
allied to J. Kenigit, the first instance of the genus on the continent. 
In the “ Paleozoic Fossils,” Billings notes the differences between 
this form and &. Oweni= R. occidentalis, which, however, arise from 
its different state of preservation. 
Distribution.—Niagara limestone: Township of Esquesing, On- 
tario, Canada. 
