214 MICROPOHELLID^. 



(Dr, Lyall). NdiY. thyreophora: — Australia; New Zealand 

 (T. H.) : Mediterranean (A. W. Waters). 



Range in Time. Coralline Crag, on Terebratula 

 (Bowert)ank) : Older Pliocene, Castrocaro (Manzoni) . 



b. With a circular pore. 



MiCROPORELLA IMPRESSA, Audouin, 

 Plate XXVI. figs. 9-11 ; and Plate XXIX. figs. 10, 11. 



Flustra impkessa, Aud. Expl. (182B) i. 2-10: Savigny, Egjpte, pi. x. fig. 7. 

 ?E.sciiARA BiMUCRONATA, Moll, Escbara &c. 65, pi. iv. fig. 18 ( = var. a). 

 Lepralia granifera, Johnst. Bi-. Z. ed. 2, 309, pi. liv. fig. 7 : Busk, B.M. 



Cat. ii. 83, pi. Ixxvii. fig. 2, pi. xcv. figs. 6, 7. 

 Lepralia pvriformis, Bask, Crag. Pol. 61, pi. v. fig. 3 ( = var. y). 



Zooecia elongated, often lozenge-shaped, narrowed off to a 

 point below, quincnncial, walls vitreous and glistening, 

 thickly covered with raised punctures, or with a line of 

 them round the margin ; orifice arched above, straight 

 below, with a narrow rim^ unarmed; median pore 

 minute, circular, slightly dentate, placed a little below 

 the orifice, sometimes a blunt umbo immediately be- 

 hind it. OoRcia globose, punctured. 



Polypides small, with about 15 tentacles. 



Var. a {tbimucronata, Moll: var. cornida, Busk). An 

 erect, conical process on each side of the orifice ; some- 

 times an umbo on the upper part of the ooecinm in 

 front. 



Var. yS {glabra) . Zooecia white and porcellaneous, flattish, 

 transversely rugose, punctures round the margin only, 

 in a single line ; rest of the surface smooth ; an umbo 

 below the median pore. Ooecia with a very prominent 

 keel down the centre, terminating above in a large 

 \imbo, with a line of punctures round the base and a 

 few scattered over the surface. 



Var. 7 {pi/riformis, Busk). Zocpcio destitute of the median 

 pore. 



