124 THE CRAG POLYZOA. 



Habitat.— Q. Crag, 8. Wood. 



The regular clavate form of this species, apparently at all ages, will at once serve to 

 distinguish it from any of its congeners. In Plate XIX, fig. 6, the young state of H. 

 pustulosa is represented, and at a time when the division into branches has but just com- 

 menced. In outward form, therefore, it may be conceived that at a still earlier period 

 that species might be confounded with the present ; but even then no difficulty in the 

 diagnosis is, I think, to be apprehended, if the minuter characters are attended to. In 

 referring this species to the C. clavata of Goldfuss, I am guided solely by the general 

 aspect, so that the identification should not be taken for more than it is worth. Dr. 

 Reuss's H. anamolojjora (a tertiary form) is clearly the same as C. clavata, Goldfuss, and it 

 is difficult to understand how he could have confounded it with the wholly distinct (7. 

 anamolopora of Goldfuss. 



2. H. RETICULATA (/2. 5^- ) ? ^ 



Ramosa ; ramis dichotomis, cylindraceis, truncatis ; superficie sulcata seu reticulate 

 fibrosa, Cellularum orificiis simplicibus, parvis, orbicularibus, superficie aequatis, distan- 

 tibus, sparsis. Ostiolis minimis elongatis irregulariter inter et circa orificia dispositis. 

 Cellulis angustis a3qualibus, parietibus imperforatis ; tubulis interstitialibus perangustis. 



Polyzoarium dichotomously branched ; branches cylindrical, truncate ; surface sulcata 

 or fibro-reticulate ; cell-orifices simple, small, orbicular, level with the surface, wide apart, 

 scattered; interstitial orifices very small, elongated, disposed some around the larger 

 orifices, others in the longitudinal sulci and reticulations on the surface ; tubes of cells 

 narrow, of uniform diameter, walls not perforated ; interstitial canals very narrow. 



Ceriopora dichotoma (?), (pars), Goldfuss, Petrefact. Germ., p. 34, pi. x, fig. 9, d, e, 



and ?/. 

 Heteropora DiCHOTOMA, Hagenow, Maast. Kreideb., p. 47, pi. v, fig. 15 ; Renss, Foss. Pol., 



d. W., T. B., p. 35, pi. V, fig. 20 (not Michelin). 



Habitat.— C. Crag, S. Wood; J. 8. B. 



If regard were paid only to the figures in Goldfuss, above cited, and which 

 represent merely the natural size and general aspect, no hesitation could be felt 

 in assigning the Crag fossil to the same species as the one there represented, and which 

 appears to be quite distinct from that represented in the same figure under a, b, c. 

 But doubts arise with respect to this identification, when we come to examine the 

 excellent and minute figures of the Goldfussian species, and even taken, as it would seem, 



' By accident it was discovered that no figure of this species had been prepared until the last plate 

 was completed. 



