INTRODUCTION. Ixi 
but much shorter, and terminated by an oblique semicircular or subtriangular calice, the 
edge of which projects on one side. 
Typ. sp., Alveolites spongites, Steininger, Mém. de la Soc. Géol. de France, vol. i; Calamopora 
spongites, Goldfuss, Petref. Germ., pl. xxviii, figs. 1%, 1°, 1°. 
Second Tribe—CH ATETIN AB. 
Corallum massive. Malls not perforated. Neither septa nor ccenenchyma. 
5. Genus CH&HTETES. 
Fischer, Oryet. du Gouy. de Moscou, p. 159, 1837. 
Corallum glomerate. Corallites very long, basaltiform, and in general more or less 
bent. Calices polygonal. Tasule independent, not connected in the adjoining corallites, 
nor placed on the same level throughout the corallum. 
Typ. sp., Chetetes radians, Fischer, loc. cit., pl. xxxvi, fig. 6. 
6. Genus DAnta. 
Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 261, 1849. 
Corallum having most of the characters of Chatetes, but with the tabula connected 
through the different corallites so as to constitute a series of common plates, and to divide 
the whole mass mto a great number of parallel strata. 
Typ. sp., Dania Huronica, Milne Edw. and J. Haime, loc. cit. 
7. Genus STENOPORA. 
(Pars) Lonsdale, Geol. of Russia and Ural Mount., vol. i, p. 631, 1845. 
Corallum very similar to Cheetetes, but having small styliform processes at the angles 
of the calices. 
Typ. sp., Stenopora spinigera, Lonsdale, loc. cit., pl. a, fig. 2. 
8. Genus CONSTELLARIA. 
Dana, Zooph., p. 537, 1846. 
Third Tribe—HALYSITIN AS. 
Corallum composed of corallites constituting vertical lamine or fasciculi, but more or 
less free laterally, and united by means of connecting tubes or mural expansions.  Wa//s 
well developed, and not porous. Sepéa distinct, but small. 
