A MONOGRAPH OP THE TERTIARY POLTZOA OF VICTORIA. 



31 



the spocies of this £^enus, without the aviciilaria and chitinnus parts is so difficult 

 that a satisfactory determination is frequently impossihlo. 



S. C. UiticeUa, n.sp. PL III., fii?. 27. 



C. oviceJlosa, Waters, Q .J.G.S., 1881, p. 321. 



Zooecia quadriserial, ovate, distant longitudinally, separated hy narrow raised 

 lines, within which they are much and ahruptly raised, sloping inwards to the 

 central part, which is much depressed, especially below the thyrostome ; thyrostome 

 lunate, upper lip finely crenidated, lower much depressed. 



S.P. 



This is evidently the C. oficpJlosa of Waters, but I doubt the correctness of liis 

 identification Avith Stoliczka's si)ecies, and therefore describe it as new. 



9. C. dennanff, n.sp. PI. XXII., fig. 14. 



Zoarium consisting of long, thick cylinders. Zoa^cia alternate in longitudinal 

 series, rhomboidal ; margins thick ; front depressed, finely granular ; thyrostome, 

 occupying the upper half of the zooecium, semicircular, lo\v(>r margin straight or 

 slightly convex upwards, with a conspicuous internal denticle on each side. 

 Avicularian cells replacing ordinary zooecia in a series, than which they are larger ; 

 opening for mandible broad, rounded above, occupying the middle third, its lower 

 edge with a rounded notch, from each side a slight elevation extending outwards to 

 the margin. 



Cape Otway, Mr. Dennant. 



I have much pleasure in associating with this species the name of Mr. Dennant, 

 who is well known for his many valuable contributions to the geology of Victoria. 

 It is notably distinct from any other species with which I am acquainted, from all 

 of which it is distinguished by the very peculiar and characteristic aviculai-ian cells. 



10. C. cucuUata, n.sp. PI. XXII., fig. 15. 



Zoarium cylindrical. Zooecia alternate in longitudinal scries, hexagonal ; 

 margin broad, raised, rounded and sloping inwards, finely granular ; thyrostome 

 occupying the middle third of the zooecium, subquadrate, narrower below ; peristome 

 forming a thin, sharp, raised margin ; no internal denticles. Ovarian pores very 

 large, occupying the whole of the front of the zooecium above the thyrostome. 

 Avicularian cells replacing ordinary zooecia in a sei-ies, larger, the upper part 

 forming a finely-granular hood arching over tlie opening; on each side of the large 

 opening below a small round depression, with its thickened margin encroaching on 

 the opening. 



