CELLEPORA DICKOTOMA. 403 



believe, arc, to some extent, right. In a large proportion 

 of cases the surface seems to be entire; but I have met 

 with cases in which it was rather thickly punctured. 

 This character can hardly be relied on as a specific 

 diagnostic. The raised peristome of the cell unites with 

 the arch of the aperture of the ovicell, and gives the latter 

 a hooded appearance. The projection in front of it is, 

 I believe, generally present when the ovicell is fully de- 

 veloped, and gives it a very peculiar and picturesque 

 appearance. 



Cellepora dichotoma, Hincks. 



Plate LV. figs. 1-6, & 7-10 (var. aUemiata). 



Cellepora dichotoma, Hincks, Devon & Cornw. Cat., Ann N. H. ser. 3, 



ix. 304 (49 Sep.), pi. xii. figs. 7, 8 : Alder, Quart. Journ. 



Micr. Sc. (n. s.) iv. (1864), 96, pi. ii. figs. 2-4: M-Intosh, 



Mar. Faun. St. Andrews, 48. 

 Cellepora .\ttenuata. Aider, Quart. Joum. Mier. Sc. (n. s.) iv. (186i), 



97, pi. ii. figs. 5-8. 

 Cellepora ramulosa, forma avicularis (part.), Smitt, loc. eit. 32. 

 Cellepora avicularis, Smifl, Flor. Bryoz. pt. ii. 53, pi. ix. figs. 193-198. 



Zoarium slender, narrowed towards the base and expand- 

 ing upwards, dichotomously branched with great regu- 

 larity, or of stouter habit, much and irregularly 

 branched ; branches sometimes cylindrical, slender, 

 tapering, with a somewhat pointed extremity; some- 

 times broader, divided above into short blunt segments. 

 Zooecia ovate, ventricose, smooth, irregularly heaped; 

 orifice suborbicular, with a thin raised peristome ; be- 

 low it a short, broad and blunt rostrum, with an avi- 

 culariuni on one side of it, mandible subtriangular. 

 Ocecia globose, prominent, silvery, covered in front with 

 raised punctures, united to the peristome. Numerous 

 small, raised, circular avicularia, and frequently a con- 

 siderable number of large spatulate avicularia distri- 

 buted over the zoarium. 



Height not exceeding 1 inch, generally less. 



2d 2 



