Agelacrinidae and Lepadocystinae 473 
43. Brockocystis clintonensis, Parks 
{Lepadocysiis clintonensis, Parks. American Journal Science, vol. XXIX, 1910, 
p. 404 , Figs. 1,2) 
This species unquestionably is congeneric with Brockocystis 
tecumsethi. It not only has the same diagrammatic arrangement 
of the plates but also a closely similar form of ornamentation. 
The type specimen, No. 372C1, in the Museum of the University 
of Toronto, is 15 mm. high and 10 mm. wide, while the height of 
Br. tecumsethi is 23 mm. The type of Br. clintonensis was found 
at the Forks of the Credit River, Ontario, in the Cataract forma- 
tion. The plates are not elevated at the center into large hemi- 
spherical protuberances, but follow merely the general convexity 
of the theca. The column is round and tapers distally. The first 
ten columnals, at mid-length, show a sharp transverse crest and 
occupy a length of about 7 mm. Distally, the columnals increase 
in length, and beyond the tenth columnal the crest becomes less 
defined and the columnals become barrel-shaped. The seven- 
teenth columnal is 2 mm. long and about 2 mm. wide. 
44. Brockocystis huronensis, Billings 
Apiocystites huronensis, Billings. Catalogues of the Silurian Fossils 
of Anticosti, 1866, p. 91, fig. 28. 
Apiocystites, {y.) huronensis, Schuchert. On Siluric and Devonic Cys- 
tidea and Camarocrinus. Smithsonian Miscellaneous Collections, vol. 
47, part 2, 1904, p. 212. 
The original description is as follows; in this description the 
numbers of the plates have been added in brackets. 
The specimen is partly buried in stone and its generic characters 
cannot be ascertained. The plates are moderately convex, de- 
pressed at the sutures. The rhomb at the base is one-half on a 
basal plate (plate 1), and one-half on a plate (plate 5) of the second 
series. In the upper part is another rhomb, one-half of which is on 
a plate (plate 10) of the third series, and the other apparently on 
a plate (plate 15) of the fourth. The lower half, however, of the 
basal rhomb (plate 1), and the upper half of the upper rhomb 
(plate 15) are not distinctly seen. As no arms are visible, it 
seems certain that this species is not a true Apiocystites. The 
position of the rhombs also favors this view. The specimen was 
