Art I. — Further Descriptions of the Tertiary Pol 



Victoria. — Part II. 



By C. M. MAPLESTONE. 



(Plates I. and II.) 



[Eead 9th March, 1899.] 



(uj LIBRARY Ugj 



Stenostomaria solida, Waters, sp. (PL I., Fig. 1 and \a). 



Ooecium subglobose, or galeate, with large, subquadrate, 

 depressed, but convex, coarsely granulated area in front, sur- 

 rounded with a thick, elevated margin (in the upper part double), 

 which at the centre of the top is disconnected, the ends curving 

 slightly upwards ; at the lower angles it extends only a short 

 distance over the ooecial opening and curves upwards with 

 thickened, rounded ends. A zooecium above the depressed area 

 with the thyrostome rounded above, contracted by a denticle on 

 each side, with an acute deep sinus in the lower margin, a ridge 

 on each side of the thyrostome extending outwards as a continua- 

 tion of the margin of the depressed area, bearing a small oval 

 avicularium on the summit. Ooecial aperture wide, arched above. 

 Dorsal surface very convex, with a ridge around the margin and 

 a central vertical one running over an oval enlargement in the 

 centre. 



Locality. — Mornington. (T. S. Hall). A single specimen 

 which, unfortunately, is imperfect, in that it has not the usual 

 proximal zocecium, so that the shape of the ooecial aperture is not 

 defined. The thyrostome of the upper zooecium is not quite 

 perfect, but is sufficiently so to show that its shape is the same 

 as that of the ordinary zooecia of ^. solida ; and on the dorsal 

 surface is a globose elevation under a median ridge similar to 

 that which exists in some specimens of this species. 



As S. solida is the only species of the genus known, and it is 

 very plentiful in the deposit in which this was found, I think it 

 is quite certain this ooecium belongs to that species. 



1 



