74 THE CRAG POLYZOA. 



correspond with the outhnes of individual cells, but seem, in cases where they are well 

 developed, to be tubular, representing, in all probability, the radical tubes of some other 

 cheilostomatous Polyzoa. There will, furthermore, be observed on the dorsal aspect, in 

 some species, avicularia, variously placed with respect to the fenestras, and whose situa- 

 tion appears to afford pretty constant specific characters. 



1. R. CELLTJLOSA, Linn, (ftp.) PI. XII, fig. 1. 



Polyzoario turbinato sen crateriforrai, undulato, crispo ; dorso vibicato et apud angulos 

 fenestrarum inferiores, avicularia papilliformia exhibente. Cellulis subcylindraceis super- 

 ficie glabra. Ostio suborbiculari, labio inferiori rostriformi, uno latere aviculario armato. 



Polyzoarium turbinate or crateriforni, undulated, curled. Cells subcylindrical, surface 

 smooth ; orifice suborbicular, lower lip projecting, with an avicularium on one side ; dorsal 

 surface strongly vibicate ; a papilliform avicularium at the lower angle of the fenestrae. 



Retepora eschara marina, Imperato, Hist. Nat., p. 821, 1559. 



Madrepora forma ros^, MarsiffL, Hist. d. 1. Mer., p. 149, tab. xxxiii, fig. 161, 1725. 

 Reticulum marinum., Rumph., Amboin., vi, p. 247, t. Ixxxvii, fig. 6, 1705. 

 Millepora (sp.), Ellis, Corallin., p. 72, tab. xxv, fig. dn, 1755. 



— RETEPORA, Pallas, Elench., p. 243, 1766; Borlase, Cornw., p. 240, pi. xxiv, 



fig. 8. 



— CELLULOSA, Liiin., Syst. x; Jameson, Wern. Mem., i, 560 ; Cavolini, Pol. Mar., 



p. 64, tab. iii, figs. 12, 13, 1785 ; Esper, Mill., tab. i, 1791—8. 



— FORAMINOSA, ElUs and Solander, Zooph., p. 138, pi. xxvi, fig. 2, 1786. 

 Retepora CELLULOSA, Lamk., Ann. S. Vert., torn, ii, p. 182, 1815 — 22, 2d ed., torn, ii, 



p. 276, 1836; Lamx., Exp. Metb., p. 41, tab. xxvi, fig. 2, 1821 ; 

 Blainville, Man. d'Actin., p. 433 ; Alas, pi. Ixxvi, fig. 1 ; Bush, B. 

 M. Cat., part ii, p. 94, pi. cxxi, figs. 3 — 8 ; pi. cxxiii, figs. 5, 6, 7 ; 

 Reuss, Foss. Polyp. W. Tertiar-beck, p. 47, tab. vi, fig. 34, 1847; 

 Michelin,, Iconog. Zooph., p. 71, pi. xiv, fig. 10, 1847. 



— RETICULATA, Johtist., Brit. Zooph., 2d ed., vol. i, p. 253 (ex. syn.), 1847. 



— FRUSTULATA (?), LamarcJc, Ann. S. A'^ert., 2d ed., p. 279 ; Befrance, Diet, des 



Sc. N., t. 45, p. 282 ; Blainville, Man. d'Act, p. 434. 



Habitat. — Cor. Crag, S. W. ; J. S. B. ; in the Leithakalke of Eisenstadt and Morbisch, 

 in Hungary ; Tertiary Marls of Freden Luitherst and Diekholz, and of Astrupp, near 

 Osnabriick ; on the Superga, Turin ; South of Prance, Reuss ; Angers, Menard; Doue 

 and Vihier (Maine-et-Loire) ; St. Laurent des Mortiers (Mayenne), Angles and Vedennes 

 (Vaucluse), L'Etang de Thau, near Cette (Hcrault), Michelin. {Recent) Mediterranean ; 

 Britain, south and west coast. 



The distinguishing characteristics of Retepora cellulosa are — the existence on one side 

 of the lower lip, or a little Ijelow it, of an elongated slit-like avicularium ; the absence of a 



