tJie Genus Fistulipora, M^Goy. 509 



others described by him, viz. F. eriensis and F. spinuUfera. 

 We cannot corroborate the accuracy of his comparison with 

 reference to the latter of these forms, for we do not possess 

 specimens of it; but with regard to F. eriensis we find 

 ourselves quite unable to agree with Dr. Eominger. It is in 

 every way a coarser form than F. utriculus ; it occurs in 

 large laminate folded masses, and the autopores greatly ex- 

 ceed in magnitude those of F. utriculus. F. eriensis, more- 

 over, is provided with acanthopores, which are wanting in 

 F. utriculus. 



The present species resembles Fistulipora trifoliata, Schliit. 

 (PI. XVIIT. figs. 1-1 c), in the strong development of the 

 folds of the autopores, but in other details of its structure as 

 well as in its habit of growth it is sharply distinct from that 

 form. There is another species, liowever, to which Fistuli- 

 pora utriculus is very closely related, viz. F. Ooldfussi; and 

 it was not without hesitation that we resolved to keep them 

 apart. Both are exactly similar in habit of growth and ex- 

 ternal markings, and there is also a general conformity in 

 their minute structure. The points in which the two species 

 are dissimilar are these: the autopores are larger and less 

 numerous in F. utriculus than they are in F. Goldfussi, and 

 the folds are more strongly developed in the former species 

 than they are in the latter. 



Formation and Loccdity. Common in the shales of the 

 Hamilton group (Devonian), at Thetford (formerly called 

 Widder), and at Arkona, in the Province of Ontario, Canada. 



Fistulipora Torruhice, De Verneuil & Haime, sp. 

 (PL XVI. figs. 2, 2 a, 2 h.) 



Clicetetes Tori'uUce, De Verneuil & J. Haime, Bull, Soc. G^ol. de F'rance, 

 2"^ ser. t. vii. p. 162 (1850) [no description or figures] ; Milne- 

 Edwards & Haime, Polyp. Foss. des Terr. Pal. p. 268, pi. xx. 

 figs. 5, 5 a (1851). 



MonticuliiJora Torruhice, Milne-Edwards, Hist. Nat. des Ooralliaires, 

 torn. iii. p. 277 (1860). 



Spec. char. Corallum subramose, or in large sublobate 

 masses, which present a coarsely mamillated appearance 

 and are made up of a succession of concentric superimposed 

 lamina. Surface monticulose ; the monticules rather incon- 

 spicuous, distant from each other 3 or 4 millim. Autopores 

 subcircular or oval in general outline, closely approximated ; 

 rarely in contact ; readily distinguishable by the naked eye. 

 About three of those of average size occupy the space of 

 1 millim., and about two of the larger ones, which are in the 

 region of the " monticules," fill a similar space. The folds of 



