244 DESCRIPTION OF CHALK CORALS. 
cannot be regarded as a fully established genus ; and so far as it is known, it 
differs from the subject of this notice. Believing therefore that the chalk fossil is 
not referable to any known genus, the term Monocarya is suggested for it, not 
on account of verbal precision, but in allusion to the previous determination, 
and in contradistinction to Monomyces, should any zoophytes be found, recent or 
fossil, possessing the peculiarity of permanently fixed Fungie (Moxne). 
Monocarya, n. g. 
Single, fixed, rarely gemmiferous on the side; more or less enveloped by the 
animal, more or less thickened externally ; lamella numerous, simple, unequal ; 
many intermediate transverse plates ; centre reticulated ; no internal filling up. 
Monocarya centralis (Caryophyllia centralis, Mantell). (Tab. XVIII. figs. 1 to 10.) 
Cylindrical or conical, often bent ; base a more or less extended layer ; exterior 
ribbed, papillated ; ribs variabie in outline and dimensions, altering during de- 
velopment; occasionally concealed by external thickening; terminal cavity shallow 
or deep ; lamellze unequal in breadth, uniformly thin, waved, jagged, tuberculated 
on the sides, when perfect and fully produced, the broadest project above the 
margin with a rounded outline ; intervals between lamelle distinct at the circum- 
ference of the cavity; transverse plates thin, slightly curved, irregularly distri- 
buted, none visible in terminal cup; centre more or less ample, formed of reti- 
culated lamine. 
Columellus turbinatus, Lhwyd?  Lithophyl. Brit. Iconographia, Ist edit. p. 8. 
nos. 136, 137, 1699. 
Corallite or Madreporite, Parkinson, Org. Rem. vol. il. p. 32. pl. 4. f. 15, 16. 
Madrepora centralis, Mantell, Fossils of the South Downs, 1822. 
Caryophyllia, Conybeare and W. Phillips, Outlines of Geol. of England, p. 74, 
1822. 
Caryophyllia centralis, Fleming, Brit. Anim. p. 509. no. 6, 1827-1828 ; Man- 
tell, Geol. Trans. 2nd series, vol. ii. p. 204, 1828-1829; Geology South-East of 
England, 1833 ; Wonders of Geology, 3rd edit. vol. 1. p. 307. fig. 3, 1839; J. 
Phillips, Geol. of Yorkshire, part 1. pl. 1. fig. 13, 1829 ; R. C. Taylor, Mag. Nat. 
Hist. vol. ii. p. 271. fig. f, 1880; De Blainville, Man. d’Actinol. p. 346, 1830— 
1834; Milne-Edwards, 2nd edit. Lamarck, t. ii. p. 358, 1836; Morris, Cat. 
Brit. Foss. p. 32, 1843; Ansted, Geology, Introductory, Descriptive, and Prac- 
tical, vol. i. p. 475. fig. c. 
