326 



A. W. WATEES ON FOSSIL CHILOSTOMATOUS 



two cells turned towards the other side. Area an irregular oval, with 

 margin thickened, much raised, surrounded by numerous spines. 



24. MlCEOPOEA PATULA, Sp. UOV. 



Zocecia distinct, divided by a scarcely raised thin border, sub- 

 quadrangular, finely granulated with small pores, more numerous 

 round the edges ; distal portion of the zocecium much depressed, 

 raised above the distal edge of the aperture and forming a hood over 

 it. Oral aperture rounded above, straight below, with a much raised 

 lip or rim. 



Aperture 025 millim. wide, 0*14 long. 



This has some resemblance to Vmcidaria hinotata and cucullata of 

 Reuss and Manzoni ; but the fragment is so small that we do not 

 know if it grew in the Vincidaria-tovm. The mouth is much larger ; 

 and also the zocecial border is less distinct. 



Loc. Fossil : Mount Gambier (Lond. Geol. Soc. coll.). 



25. Ceibeillina teeminata, sp. nov. Plate XVII. fig. 68. 



Zoarium in the Hemescliara-ioYm. Zocecia but very slightly raised, 

 the plain borders of neighbouring zocecia nearly confluent, so that 

 the divisions of the zocecia are scarcely visible; cribriform area 

 somewhat depressed, the large pores concentrically arranged. Oral 

 aperture rounded on the distal edge, straight on the proximal, con- 

 tracted below. Small rounded avicularium above the aperture, 

 a small one immediately below, a little to one side, and a small one 

 on each side, just below the line of the aperture. 



Oral aperture 0*13 millim. wide at base, 0*17 at widest part, 

 0-13 long. 



This seems to have much in commou with Lepralia scutulata. 

 Busk (Q. J. M. S. vol. iii. 1855, pi. ii. figs. 1, 2) ; and it is difficult 

 to know where it should be placed, as the pores do not seem to show 

 any radial structure, and the aperture is contracted below, having 

 the same shape as the oral aperture of Diporula verrucosa. It also 

 has many points in common with C. punctata, and is one of those 

 types which appear to be connecting links between widely separated 

 forms. 



26. Ceibbillina dentipoe, sp. nov. (in Bactridii forma). Plate XV. 



fig. 33. 



Zoarium erect, with zocecia only on the front ; zocecia growing 

 from the side near the distal end of the zocecium below, the axis of 

 each zocecium being thus diagonal to each of its neighbours. Zocecia 

 with a large raised cribriform area, the pores being placed concen- 

 trically, each pore with a denticle pointing away from the centre of 

 the area. Oral aperture semicircular, with a straight proximal 

 edge, 0*14 millim. wide. A small avicularium directed outwards 

 on each side of the aperture. Dorsal surface with a central groove, 

 and smaller depressions on each side. 



The fragments are small, and not sufficient to found a new genus 

 upon, which may possibly be necessary when large pieces are found ; 



