82 TABULATE CORALS. 



Pachypora cervicornis, De Blainville, sp. 



(PI. IV., figs. 3-3^.) 



Calanwpora polymorpha, var. ramoso-divaricata, Goldfuss, Petref. Germ. t. i. 

 PI. XXVIL, figs. 3^', 4^, ^b, 4c(caet. exclusis), 1826. 

 „ spongites, var. ramosa, Goldfuss, ibid., PI. XXVIII., figs. 2(7-2^ 



(cset. exclusis), 1826. 

 Alveolites cervkornis, De Blainville, Diet. Sci. Nat, t. Ix. p. 369, 1830. 



„ reticulata, De Blainville, ibid., p. 369, 1830. 

 Favositcs cronigera, Alveolites celleporatus, and Alveolites spo?igites, D'Orbigny, 

 Prodr. de Paleont, t. i. pp. 107, 108, 1850. 

 „ cei-vieornis, Milne-Edwards and Haime, Pol. Foss. des Terr. Pal., 

 p. 243, 1851 ; and Brit. Foss. Cor., p. 215, PL XLVIII., fig. 2 (?), 



1853- 

 „ reticulata, Milne-Edwards and Haime, Pol. Foss. des Terr. Pal, 

 p. 241, and Brit. Foss. Cor., p. 215, PI. XLVIII., figs. \-\h, 



1853- 

 „ polymorpha, Billings (pars), Canad. Journ., new sen, vol. iv. p. in, , 



fig. II, 1859. (N on Goldfuss.) 

 „ reticulata, Nicholson, Rep. on the Pal. of Ontario, p. 51, PI. VII., 



fig. 2, 1874. 

 „ duhia, Nicholson (pars), ibid., p. 51, PI. VII., fig. 5, 1874. (Now 



Favositcs cervicornis, Nicholson, ibid., p. 52.) 

 ,, limitaris, Rominger(?), Foss. Cor. of Michigan, p. 35, PI. XIII. 



Spec. Char. — Corallum of branching cylindrical stems, which 

 vary in diameter from two up to ten lines, and which some- 

 times inosculate so as to form reticulated expansions. Coral- 

 lites essentially polygonal, but having the visceral chamber 

 greatly narrowed by a secondary deposit of sclerenchyma, 

 which increases in amount towards the mouth. Calices sub- 

 polygonal, with thickened lips surrounding a subcircular aper- 

 ture, tolerably equal in point of size, and usually about half a 

 line in diameter, more or less. Septa obsolete, or represented 

 only by very minute spiniform tubercles. Tabulse comparatively 

 few in number (in some cases apparently numerous), complete, 

 horizontal or slightly flexuous. Mural pores few, large-sized, 

 irregularly distributed. 



Obs. — The dendroid Favositoid Corals constitute a group 

 particularly difficult to study and to separate satisfactorily into 

 species, and with the space at my command it would be use- 



