MICROPORA COMPLANATA. 175 



the Minch (A. M. N.) : Antrim ; off Sana Island (Hynd- 

 man) : Cornwall, deep water; Guernsey (T. H.) : Hastings 

 (Miss Jelly) : Caithness; Aberdeenshire (C. W. P.). 



GEOGRAPHICAL DISTRIBUTION. Florida, 36-135 fathoms 

 (Pourtales). 



MICROPORA COMPLANATA, Norman. 

 Plate XXIII. figs. 8, 9. 



LEPRALIA COMPLANATA, Korman, Ann. N. H. January 1864, 84, pi. x. 



fig. 4. 

 MEMRKA.XIPORA SMITTII, Manzoni, Brj-oz. foss. Ital. Contr. 4, 11, pL iii. 



fig. 16 (Sitzb. K. Akad. d. Wisaensch. Bd. bu. 1. Abth. 



Marz-Heft, 1870). 



Zocecia lozenge-shaped, flattened, quincuncially arranged ; 

 marginal lines smooth ; surface thickly covered with 

 rather large punctures ; mouth semicircular, well arched 

 above, slightly contracted on each side below, the upper 

 margin usually thickened and produced into a point, 

 unarmed, lower lip nearly straight, pouting. Ooecia 

 depressed, in the form of a quarter-moon, smooth. 



Colony forming a white, glossy crust. 



HABITAT. On shells and stone. 



LOCALITY. Unknown. Mr. Norman's specimens were 

 found without label amongst Mr. Barlee's extensive collec- 

 tion. They occurred on shell, and "in the little hollows 

 of a rounded and much water- worn piece of coarse-grained 

 granite." 



RANGE IN TIME. Italian Pliocene deposits (Manzoni). 



Membranipora Smittii of Manzoni is clearly identical 

 with the present species. But in the fossil there is always 

 a small callosity on each side near the lower corners of the 

 mouth, which is rarely developed in the recent form; it 



