298 E. M. Bnjdonc—Ftiiihor Notes on. tJw Tniiwiiufjham Chalh.. 



avicularian), whicli rest on the side walls and open just beside the 

 aperture. In the centre this third section rests on the second section, 

 and its lower edge having a deep sinus an inlier of the second 

 section is exposed. At the sides tl)e third section rises considerably 

 above the second section, and so tiiere is a well-marked opening 

 left. The upper edge of this third section carries two very minute 

 and slender beak-shaped avicularia lying transversely with their 

 beaks directed inwards. These constitute the apparent lower lip of 

 the aperture, and according as they do not quite meet, just meet, oi' 

 rather more than meet, in the middle line, the apparent lip has 





Fig. 9. 



a central sinus, is quite straight, or has a central denticle. This- 

 apparent lip is on the same vertical plane as the deep-set aperture of 

 the ovicell, and entirely conceals the aperture of the cell, and leaves 

 only a small space between itself and the sloping surface of 

 the ovicell. Below the transverse band is seen the normal front 

 wall with five pairs of radiating furrows, and a single unpaired one 

 in the middle line at the foot. The ovicell and transverse band are 

 practically always present, and the species, which is quite small, is 

 easily recognisable with a pocket magnifier, though the details are- 

 hardly discernible under the microscope. 



]\IucRONELLA Batheri, sp. nov. (Fig. 10.) 

 Colony always adherent, small and very prominent, partly owing 

 to the compactness of its surface and partly apparently to its being 

 bilamellate. The cells of the lower lamella are wide, but very 

 shallow, and some of them may generally be seen round the edge of 

 the colony. They rarely exhibit more than the marginal wall, but 

 occasionally one may be seen with a front wall consisting apparently 

 of a number of irregular plates with a round pore in the centre. On 



Fio. 10. 

 the foundation afforded by these cells is built a layer of cells of 

 normal depth. Here the primitive cell is a simple lepralian cell 

 with an oval aperture in a sloping plane. But as the cell matures 

 the lower lip of the aperture is produced in the plane of the surface 

 of the colony into a broad square mucro overhanging the greater part 

 of the aperture and leaving only a very narrow space on either side 

 of it and between it and the broad ovicell. The latter is nearly 



