58 THE CRAG POLYZOA. 



2. C. RAMULOSA, Linn. PI. IX, fig. 2. 



Polyzoario rarnoso ; ramis cylindraceis attenuatis, apice bifidis. Cellulis ovatis elon- 

 gatis, rarepunctatis, rostro magno avicularium uno latere ad basiin ostendente inunitis. 

 Ostio suborbiculari peristomate simplici. Ovicellula, globosa, recumbente, punctata. 



Polyzoarium ramose, branches cylindrical, tapering, forked at the extremities. Cells 

 ovate, elongate, sparsely punctured ; orifice suborbicular. A large ascending rostrum in 

 front, with an avicularium on one side of it near the base. Ovicell globose, recumbent, 

 punctured. 



MILLEPORA PUMICOSA (pars), I'allas, Elenchus, p. 254. 



CELLEPORA RAMULOSA, Linn.; Johnst., Trans. Newc. Soc., ii, p. 267, pi. xii, figs. 3, -4 ; 

 Brit. Zooph., 2J ed., p. 296, pi. lii, fig. 4; Couch., Corn. Faun., 

 pt. iii, p. 110, pi. x.v, fig. 2; Busk, Brit. Mus. Cat., p. 87, pi. cix, 

 figs. 1, 2, 3. 



CELLEPOKA LEVIS, Fleming; Couch; Johnst. 



Habitat. C. Crag, Sutton, S. W., /. S. E. (Recent) Britain, tibique. 



This species may always be distinguished by the lateral or sublateral position of the 

 avicularium, by which it is distinguished from Cellepora pitmicosa, when it occurs, as it 

 often does, in a massive or adnate form around the base of the erect branching steins. 

 In recent specimens the characters are, in most cases, rendered far more distinct by 

 incineration. 



3. CELLEPORA COMPRESSA (. sjj.) PI. IX, fig. 4. 



Polyzoario subramoso, magno, dcpresso, massivo ; ramis brevibus, compressis angula- 

 tis sen subcylindraceis, truncatis. Cellulis ventricosis, alte immersis, sparse punctatis, 

 rostro parvo niunitis. Ostio suborbiculari, labio antico recto, subinde apertura rotun- 

 da minima utrinque ornato. 



Polyzoarium large, subramose, depressed, massive ; branches short, compressed, angular 

 or subcylindrical, truncate ; cells ventricose, deeply immersed, surface sparsely punctured ; 

 orifice suborbicular, straight below, with small hollow rostrum in front ; and often a 

 rounded opening on each side. 



Habitat. R. Crag, (?) C. Crag, S. JT., J. S. B. 



This species will be far more readily distinguished by its habit and general appearance, 

 than by the minute characters; which, however, even in small fragments are sufficiently 

 distinct from those of Cellepora coronopus, to render the diagnosis comparatively easy. 



