CELLEPORIDjE : CELLEPORA. 299 



pores just visible to the naked eye, and arranged in regular rows : 

 the pores are circular, even with the surface on the smooth and 

 newly formed parts, but on the older they form the apertures of 

 urceolate cells which appear to be formed over the primary layers of 

 cells, and give to the surface a roughish or granular appearance. 

 The orifice is simple, contracted, with a very small denticle on one 

 side. The thickness of the branches varies from a half to two lines ; 

 the interior cellular ; the new parts formed of two layers of horizon- 

 tal cells, but the older parts are thickened by cells superimposed on 

 the primary layers. 



This species certainly treads closely upon the genus Eschara, but 

 Dr. Fleming and Milne-Edwards, who had examined an authentic 

 specimen in the York Museum, both agree in making it a Cellepora. 

 It is entirely distinct from Eschara cervicornis, with which it has 

 been confounded ; but it is nearly allied to, and perhaps identical 

 with, the Millepora alcicornis of Esper, Millep. tab. 5, 6, and 7. 

 Notwithstanding Mr. Couch's opinion to the contrary, I continue to 

 think that the productions figured by Borlase and myself are the 

 same in species. Mr. Couch has given a good description of it. 



5. C. L^VIS, " dichotomously branched, cylindrical, the pores 

 wide, with simple mouths.'''' Rev. Dr. Fleming. 



Cellepora laevis, Flem. Brit. Anim. 532. CowTi. Zooph. Cornw. 50 : Corn. Faun. iii. 

 112. Eschara laevis, Elaine. Actinol. 428. 



Hob. " A single specimen from deep water, Zetland," Fleming. 

 On stones, off the Deadman Point, common," R. Q. Couch. 



" Height an inch and a quarter, diameter one-tenth ; the branches 

 are smooth, with the orifices of the cells smooth and concave ; to- 

 wards the extremities the branches are rough with the forming cells, 

 and the orifices are more declining, circumscribed, a little prominent, 

 with a blunt process at the proximal margin." Fleming. 



" The polypidom is calcareous, from one to two and a half inches 

 high and branched ; the upper portions of the branches roughened 

 by the formation of new cells ; the lower portions smooth and 

 polished. The cells are urceolate ; apertures small with an obtuse 

 tooth at the proximal margin. This species is somewhat similar in 

 appearance to the last, but is whiter, more delicate, and less branched," 

 R. Q. Couch. 



I am not acquainted with this species. From more than one cor- 

 respondent I have received specimens for it which were certainly 



