﻿ICHTHYODORULITES. 131 



P. 2889. Four imperfect and much abraded specimens. 



EnnisJcillen Coll. 



P. 2870. Much abraded smaller spine, doubtfully of this species ; 

 Hook Point, Wexford. Enniskillen Coll. 



Physonemus hamatus (Agassiz). 



1837. Onchus hamatus, L. Agassiz, Poiss. Foss. vol. iii. p. 9, pi. i. 

 figs. 7, 8. 



1883. Physonemus hamatus, J. W. Davis, Trans. Roy. Dublin Soc. [2] 

 vol. i. p. 370, pi. xlvii. figs. 9, 11. 



1884. Physonemus hamatus, J. W. Davis, Quart. Journ. Geol. Soc. 

 vol. xl. p. 617, pi. xxvi. fig. 6. 



Type. Bristol Museum. 



Form. <$f Log. Lower Carboniferous Limestone : Gloucestershire. 

 Upper Carboniferous Limestone : Yorkshire. 



P. 4901. Spine of the form assigned to this species by J. W. Davis, 

 loc. cit. (1884) ; Yoredale Rocks, Wensleydale, Yorkshire. 



Home Coll. 



The following species have also been described, but there are no 

 examples in the Collection : — 



Physonemus acinaciformis : Xystr acanthus acinaciformis, St. John 

 & Worthen, Pal. Illinois, vol. vi. (1875), p. 459, pi. xx. 

 fig. 2. — Coal-Measures ; Illinois. 



Physonemus anceps : Drepanacanthus anceps, Newberry & Wor- 

 then, Pal. Illinois, vol. ii. (1866), p. 122, pi. xii. fig. 8: 

 Xystracanthus anceps, St. John & Worthen, op. cit. vol. vi. 

 p. 458. — Coal-Measures ; Illinois. [Type of Drepanacan- 

 thus. ~\ 



Physonemus arcuatus: Xystracanthus arcuatus, J. Leidy, Proc. 

 Acad. Nat. Sci. Philad. 1859, p. 3, and Ext. Yert. Fauna 

 W. Territ. (Rep. U.S. Geol. Surv. vol. i. 1873), p. 312, 

 pi. xvii. fig. 25. — Upper Coal-Measures ; Kansas. [Type 

 of Xystr 'acanthus , requires new specific name.] 



Physonemus carinatus, St. John & "Worthen, op. cit. vol. vi. p. 452, 

 pi. xviii. figs. 4, 5. — Kinderhook Limestone ; Illinois. 



Physonemus Chester ensis, St. John & Worthen, op. cit. vol. vi. 

 p. 455, pi. xix. fig. 4. — Chester Limestone ; Illinois. 



Physonemus clepressus, St. John & Worthen, op. cit. vol. vi. p. 452, 

 pi. xviii. fig. 3. — Kinderhook Limestone ; Illinois. 



Physonemus falcatus, St. John & Worthen, op. cit. vol. vii. (1883), 

 p. 252, pi. xxiv. fig. 6. — St. Louis Limestone ; Missouri. 



k2 



