Victorian Fossil Selenariidae. 213 



cell being very much larger than the zooecial cells. I have not 

 seen the vibracula, there are none preserved upon the specimens 

 I have. This is the form, as before stated, wliich Woods 

 described as S. punctata, it is not found fossil, and I have 

 described it from my specimens as, in his description, he has 

 mistaken the distal end of the zooecium for the proximal and the 

 vibracular cells for ooecia. 



S. bimopphocella, nov. sp. (PI. XXIV., Fig. 3). 



Zoaria discoid, up to 1 cm. in diameter, slightly convex. 

 Zooecia, 0.3 mm. wide, 0.2 long, imbricate, in very regular linear 

 series, the distal margin being nearly a semicircle, the lateral 

 and proximal margins are formed by the distal margins of the 

 adjoining zooecia. In some of the larger (adult) zoaria, there are 

 on the margin one or two rows of zooecia more than double the 

 size of those in the other portion of the zoaria, about 0.4 mm. 

 long, and the same wide, and on the extreme margin there are 

 some large, apparently imperfect, zooecia with very large trifoli- 

 ate apertures, which are seen when they are incinerated. The 

 thyi'ostomes are arched above and nearly straight below, the 

 membranous layer is raised (especially in the larger zooecia) into- 

 a convex elevation below the thyrostome. The two pores in the 

 calcareous front wall are very rarely perceptiVjle through the 

 membranous layer. When incinerated the thyrostome in the 

 normal zooecia aie seen to be arched above, with a broad curved 

 sinus below, in the angles of which are two round pores, so close 

 to the proximal margin that sometimes it is either broken away, 

 or not calcified, so as to resemble the thyrostome of S. maculata ;. 

 but in the larger zooecia they are arched above and nearly 

 straight below, the two pores are stellate and at some distance 

 from the proximal margin. The vibracular cells are ovoid, 

 closely punctate, the vibracula thick and nearly straight (only a 

 portion is shown in the figure). The edge of the zoaria is covered 

 with small granulations. Dorsal surface ridf^ed, with numerous- 

 large round pores. 



Locality. — St. Vincent's Gulf, >S.A., 17 fathoms (Dr. Verco);. 

 Fossil, Jimmy's Point (J. Dennant). 



This is separated from the other forms by the presence on the 

 margin, of adult zoaria, of one or two rows of zooecia more thaix 



