74 THE CRAG POLYZOA. 



correspond with the outlines 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 fenestrse, and whose situa- 

 tion appears to afford pretty constant specific characters. 



1. R. CELLULOSA, Linn, (sp.) 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, uuo latere aviculario armato. 



Polyzoarium turbinate or crateriform, 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 fenestrse. 



RETEPORA ESCHARA MARINA, Imperato, Hist. Nat., p. 821, 1559. 



MADREPOKA FORMA ROS.E, Marsiyl., Hist. d. 1. Mer., p. 149, tab. xxxiii, fig. 161, 1725. 

 EETICULUM MARINUM., Rumph., Amboin., vi, p. 247, t. Isxxvii, fig. 6, 1705. 

 MILLEPORA (sp.), Ellis, Corallin., p. 72, tab. zxv, fig. d D, 1755. 



RETEPOKA, Pallas, Blench., p. 243, 1766; Borlase, Cornw., p. 240, pi. xxiv, 



fig. 8. 

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



p. 64, tab. iii, figs. 12, 13, 1785; Esper, Mill., tab. i, 17918. 

 FORAMINOSA, Ellis 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. Meth., p. 41, tab. xxvi, fig. 2, 1821 ; 

 Blainville, Man. d'Actin., p. 433 ; Alas, pi. Ixxvi, fig. 1 ; Busk, 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. Zoopb., p. 71, pi. xiv, fig. 10, 1847. 

 RETTCULATA, Johnst., Brit. Zooph., 2d ed., vol. i, p. 253 (ex. syn.), 1847. 



FRUSTULATA (?), Lamarck, Ann. S. Vert., 2cl ed., p. 279; Defrance, Diet, des 

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



Habitat. Cor. Crag, S. W. ; J. S. . ; 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 France, Rcuss , Angers, Menanl ; Doue 

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

 (Vaucluse), L'Etang de Thau, near Cette (lierault), 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 below it, of an elongated slit-like avicularium ; the absence of a 



