334 ESCHARID^. 



Alder, indeed, did good service by pointing out the dis- 

 tinction between our British form and that which Pallas 

 and Milne -Edwards had described asMillepora (or Eschar a) 

 cervicomis ; but he retained Pallas's name for the former, 

 and it still holds its place. Sowerby's name compressa, 

 though it has never come into use, seems to have the 

 best claim to supersede it, and is sufficiently expressive ; 

 and I have therefore adopted it. 



d. Zoarium erect, branches cylindrical. 



PoRELLA L^vis, Fleming. 

 Plate XL VII. figs. 10, 11. 



Cellepora l.evis, Fleming, B. A. 532 : Johnat. B. Z. eel. 2, 299. 



EscHARA TERES, Bxisk, Ann. N. H. ser. 2, x^iii. 33, pi. i. fig. 2. 



EsciiARA LvEvis, 8ar&, Beskr. over Norske Polyz., Forh. Vid.-Selsk. Christi- 



ania, 1802, 150 (12 sap.) : Alder, Quart. Journ. Micr. Sc. 



(n. 8.) iv. 102, pi. iii. figs. 8-11 (8 sep. ) : Smitt, (Efv. Kongl. 



Vet.-Ak. Forh. 1878, 23. 

 PoRELLA LiEvis, Escharffi (auctt.) forma, Bmitt, CEfv. K. Vet.-Ak. Forh. 



1867, Bihang, 21 and 134, pi. xxvi. figs. 120-123. 



Zoarium yellowish, much branched dichotomoiisly ; stem 

 short, cyliiadrical, rising from an incrusting base ; 

 branches elongated, cylindrical, spreading, subdivided 

 dichotomously into numerous short segments with a 

 blunt extremity ; the lower portions of the zoarium 

 smooth and polished. Zocecia immersed, flatfish, ovate, 

 with a line of large punctures round the edge, surface 

 very minutely granulated; orifice somewhat longer 

 than broad, arched above, slightly contracted a little 

 above the lower margin, which is straight and bears 

 an avicularium with semicircular mandible. Ooecium 

 large, prominent, globose, the peristome slightly ele- 

 vated in front of it. 



