DESCRIPTION OF CHALK CORALS. 321 
have been provided with viscera and tentacula remains to be shown by investi- 
gations among recent Celleporide ; but it must be remembered, that cells, and 
ova also’, are produced without the direct agency of those portions of the polype. 
Among recent and fossil Hschare?, so far as is known to the author of these 
notes, the capsule would not interfere with the egress by the cellular aperture ; 
but in some species of existing Escharine or Lepralie*, and in an American cre- 
taceous Bryozoon’, it is situated as in Mr. Dixon’s fossil, directly over that 
opening. Dr. Grant especially alludes to the lineal regularity of the cells in Fi. 
carbasea (op. cit. p. 112); and a similar uniformity appears to pervade the genus 
as at present limited, also tu a great extent recent and extinct Eschare’ ; the 
relative dimensions of the cells in a species being likewise very constant. The 
specimens of the chaik fossil, submitted to examination, presented, on the con- 
trary, numerous deviations from a direct lineal succession ; also considerable 
variations in the proportions and outline of the visceral cavities, independent of 
those which had a spindle-shape and filled narrow interspaces. The incrusting 
specimen (fig. 9) displayed, as mentioned in a subsequent paragraph, still greater 
irregularities with proofs of overlying layers, no examples of which have been 
observed in the very few species of Flustre known to the author ; but somewhat 
analogous cases, though limited in dimensions, have been noticed in specimens of 
Es. foliacea. 
Among fossils which present points of agreement with the one under exami- 
nation, but with cells more symmetrical in form and distributicn, may be men- 
tioned, Eschara pyriformis and Cell. hippocrepis of M. Goldfuss®, also Es. Andega- 
vensis of M. Michelin’; likewise Es. affinis of M. Milne-Edwards*, and the Dia- 
stopora cervicornis of M. Michelin ®: it remains, however, to be shown whether any 
of those Hschare undergo the surface-changes which characterise in part that 
genus. Cellepora hippocrepis has been removed by a very high authority to Dis- 
copora’® without any additional information ; but one of the essential characters 
of also that genus" is an obliteration or want of cellular boundaries, a condition 
not indicated by M. Goldfuss’s figure 3 b (loc. cit.). 
1 Edinb. New Phil. Journ. vol. iii. p. 115. 
2 Consult M. Edwards’s Memoirs on Recent and Fossil Eschare, op. cit. 
® Dr. Johnston’s British Zoophytes, 2nd ed. p. 301, 1846. 
* Quarterly Journ. Geol. Soe. vol. i. p.71, woodcut letter e. ° Consult M. Edwards's Memoirs. 
° Petref. tab. 8. f.10a, 6; tab. 9. f. 3a, b. 7 Teon. Zoophyt. pl. 78. f. 11 a, b. 
8 Memoir on fossil E’schare, pl. 10. f.6. Michelin, op. cit. pl. 79. f. 4a, b. 
9 Op. cit. pl. 56. f. 12 a, 6. 9nd edit. Lamarck, t. ii. p. 252. no. + 13, " Tbid. pp. 218, 247. 
