ESCHARID^. 65 



(a). Foliaceous. 

 1. E. PERTUSA, M. Edwards. PI. X, fig. 2. 



Polyzoario corriplanato ; cellulis elongatis angustis, seriebus pororum 4 vel 5 longitu- 

 dinalibus signatis, rostroque ascendente avicularium supra gerente raunitis. Ostio supra 

 rotundato, medium versus constricto, utrinque denticulato, labio inferiori recto. 



Polyzoarium expanded; cells elongated, narrow; surface punctured with four or five 

 longitudinal rows of pores ; orifice rounded above, contracted below, with a small condy- 

 loid denticle on each side below the middle, and a straight lower border. A projecting 

 rostrum supporting an avicularium on its upper surface, immediately below the orifice ; 

 ovicells subglobose, smooth. 



EscHAEA PERTUSA, M. Edwards, 1. c, p. 9, pi. X, fig. 3; S. Wood, Ann. Nat. Hist., xiii, 

 p. IG ; Michelin (?), Icon. Zooph., pi. Ixxix, fig. 2. 



Habitat. — C. Crag, S. W., M. Edioards ; Doue (?), Michelin. 



The peculiar features of this well-marked form are — 1. The narrow, elongated shape 

 of the cells. 2. The projecting rostrate avicularium in front of the orifice, which in 

 many of the cells is expanded into a large, hollow, egg-shaped protuberance, supporting 

 on its summit the much enlarged avicularium. These organs were regarded by M. M. 

 Edwards as ovicells, but their avicularian nature is sufficiently manifest, and, moreover, 

 true ovicells exist in the usual situation. With respect to the latter, it may be remarked 

 that they often present a rounded perforation in front, but which, from its appearance, 

 would seem to be due to attrition, and not to represent a natural aperture. 



2. E. iNCisA, M. Edwards. PI. X, fig. 3. 



Polyzoario undato-flexuoso ; cellulis junioribus ovalibus, puncturatis ; senioribus 

 immersis, obsolete punctatis. Ostio suborbiculari, infra sinuato. Ovicellulis alte immersis 

 inconspicuis. 



Polyzoarium contorted ; cells when young oval, punctured ; when old, deeply 

 immersed, with the punctures obsolete or nearly so ; orifice suborbicular with a sinus 

 below ; ovicells deeply immersed. 



EscHARA INCISA, M. Edwards, 1. c, p. 5, pi. ix, fig. 2; Michelin (?), Icon. Zooph., p. 328, 

 pl. Ixxviii, fig. 7; S. Wood, 1. c, p. 16, 



Habitat. — C. Crag, Sudbourne, Sutton ; S. IF., M. Edwards; Touraine, Micfielin. 



9 



