﻿96 1CHTHYODORULITES. 



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. Archceacanthns quadrisulcatus, G. Kade, Programm. k. Real- 



schule zu Meseritz, p. 19, figs. 11, 12. 

 1885. Archceacanthus quadrisulcatus, F. Roemer, Palaeont. Abhandl. 



vol. ii. p. 386, pi. xxxiv. fig. 22. 



Type species of Archceacanthus. 



Form. Sf 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 Machcer acanthus. 



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. 



