96 
ICHTH YODOKULITES. 
P. 6027. Gutta-percha cast of specimen assigned to this species by 
Roemer, loc. cit ., differing only from the typical spines in 
the apparent absence of the smooth posterior area distally; 
original in the Museum of the University of Breslau, and 
obtained from a boulder, Lyck, East Prussia. 
Presented by Prof. Ferdinand Roemer, 1889. 
Onchus quadrisulcatus (Kade). 
1858. Ardiceacanthus quadrisulcatus, G. Ivade, Programm. k. Real- 
schule zu Meseritz, p. 19, figs. 11, 12. 
1885. Ardice acanthus quadrisulcatus, F. Roemer, Palceont. Abhandl. 
vol. ii. p. 386, pi. xxxiv. fig. 22. 
Type species of Archceacanthus. 
Form. Loc. Devonian Boulders : Prussia and Silesia. 
P. 6028. Gutta-percha cast of specimen figured by Roemer ; original 
from Lyck, E. Prussia, preserved in the Breslau University 
Museum. Presented by Prof. Ferdinand Roemer , 1889. 
Onchus (?) granulatus, Roemer. 
1885. Onchus granulatus, F. Roemer, Palaeont. Abhandl. vol. ii. p. 358, 
pi. xxxi. fig. 18. 
Type. University of Breslau. 
Form. Sf Loc. Upper Silurian (Beyrichien-Kalk) ; unknown. 
P. 6026. Gutta-percha cast of type specimen ; original from boulder 
near Nieder-Kunzendorf, near Freiburg, Silesia. 
Presented by Prof. Ferdinand Roemer , 1889. 
The following spine has been assigned to Onchus, but is not suffi¬ 
ciently well preserved for satisfactory determination. In many 
respects the specimen is suggestive of Machceracanthus. 
P. 2864. Type specimen of Onchus major, Etheridge, described in 
Rep. Brit. Assoc. 1871, Trans. Sect. p. 110 ; Lower Old 
Red Sandstone, Llidiart-y-Warn Quarry, near Hay, 
Brecon. Enniskillen Coll. 
The following species have also been described, but there are no 
examples in the Collection, and some may be mere fragments of 
Crustacea : — 
Onchus clintoni , E. W. Claypole, Quart. Journ. Geol. Soc. vol, xli. 
(1885), p. 61, woodc. fig, 6.—Clinton Group ; Perry Co., 
Pennsylvania. 
