A. W. WATEES ON FOSSIL CHILOSTOMATOTJS 



Zooecia hexagonal, distinct, with a thin border slightly rounded, 

 raised towards the aperture ; surface finely granular ; the region 

 above the aperture is much raised, with six spines, three on each 

 side. Aperture nearly circular, slightly elongate, situated in a wide 

 depression, caused by the elevation round the sides and distal part 

 of the aperture. Aperture 0*15 mm. wide, 0*17 long. 



This much resembles Lepralia multispinata, Busk, from Madeira 

 (Q. Jo Micr. Sc. new ser. vol. i. 1861, p. 78, pi. xxxii. fig. 5) ; but 

 the lip below the aperture is entirely wanting. 



In a specimen from the Mount-Gambier collection of Mr. Ethe- 

 ridge, jun., there are many large spatulate zocecial avicularia scat- 

 tered over the stem. 



Loc. Eossil : Mount Gambier. 



45. Lepealia cleidostoma, Sm., var. kotunda. Plate XVIII. fig. 92. 



Zoarium apparently flat and incrusting. Zooecia small, distinct, 

 hexagonal ; surface coarsely granular. Oral aperture orbicular, con- 

 tracted at the sides by two denticles ; raised rounded avicularium 

 (perhaps with vibracular characters) below the line of the aperture, 

 on the side of the zocecium ; four lateral rosette-plates, one distal near 

 the base of the zooecia. Oral aperture 0*1 mm. wide, 0*13 long. 



It is difficult to know where this should generically be placed. 

 Erom the rounded distal and proximal edges of the aperture, it would 

 have gone with Smitt's earlier definition of Eschar ella. In the size 

 and form of the cells it much resembles Schizoporella eoecubans, fig. 56; 

 but this, instead of being an erect quadrilateral form, is incrusting, 

 and has a rounded avicularium ; but we may perhaps here trace the 

 passage from a definite sinus to a rounded proximal edge. It only 

 differs from Lepralia cleidostoma, Smitt (Flor. Bry. p. 62, pi. xi. 

 figs. 217-219), in having the rounded avicularium instead of an acute 

 one, and should, perhaps, be united to it. 



I have an erect branching form, with ovicells, from the Mediter- 

 ranean, closely allied to this, which I hope shortly to describe and 

 figure. 



Mr. Hincks has kindly informed me (in Jitt.) that he has this va- 

 riety from Bass's Straits. 



46. Poeella emendata, sp. iiov. Plate XVII. fig. 69. 



Zoarium in Eschara-form. 



Surface nearly flat ; cell-wall thickened round the oral aperture. 

 Zooecia elongate, expanded above, contracted below; row of pores 

 in a furrow on each side of the zocecium. Aperture round on the 

 distal edge, straight on the proximal, with a very large denticle 

 set deeply in the aperture. Small triangular avicularium below 

 the mouth, usually placed somewhat diagonally. 



Aperture on proximal edge 0-07 millim. wide, 0-06 millim. long. 



47. Poeella denticulata, Stol. Plate XVII. fig. 70. 

 Fhistrella denticulata, Stoliczka, Eoss. Bry. Orak. p. 138, pi. xx. 



fig. 2. 



Oral aperture arched above, contracted below, enclosing an avicu- 



