214 MICROPORELLID^E. 



(Dr. Lyall). Var. thyreophora : Australia; New Zealand 

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



RANGE IN TIME. Coralline Crag, on Terebratula 

 (Bowerbank) : Older Pliocene, Castrocaro (Manzoni) . 



b. With a circular pore. 



MlCROPORELLA IMPRESSA; Audouin. 

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



FLUSFBA IMPRESSA, Aud. Expl. (1826) i. 240: Savigny, Egypte, pi. z. fig. 7. 

 ?E*CHARA BIMUCRONATA, Moll, Eschara &c. 65, pi. iv. fig. 18 (=var. a). 

 LEPRALIA GRASIFERA, Johnst. Br. Z. ed. 2, 309, pi. liv. fig. 7: Busk, B.M. 



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

 LEPRAHA PYRIFOUMIS, Busk, Crag. Pol. 51, pL v. fig. 3 (=var. y). 



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

 point below, quincuncial, 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. Ooecia globose, punctured. 



Polypides small, with about 15 tentacles. 



Var. a (? bimucronata, Moll : var. cornuta, Busk) . An 

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

 times an umbo on the upper part of the ooecium in 

 front. 



Var. ft (glabrd] . Zocecia 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 

 umbo, with a line of punctures round the base and a 

 few scattered over the surface. 



Var. 7 (pyriformis, Busk). Zomc'ia destitute of the median 

 pore. 



