22 A MONOGRAPH OP THE TERTIARY POLTZOA OF VICTORIA. 



S.P.; M.C. 



Named after my youngest daughter. 



I suspect that Waters may have, probably from imperfect specimens, confused 

 this with his C. longicollis, overlooking the absence of the depressed ribbed area, 

 and taking the specific name from the long tubular connecting tubes which are 

 much more marked in the present species. 



Ditaxipora, n.g. 



Zoo?cia alternate in two contiguous rows facing the same way, distinct but 

 closely united ; upper outer angle produced and pointed, bearing a sessile avicu- 

 larium with long triangular mandible and sharp upturned mucro. Ooecia large, 

 imbedded in the zooecia above. 



1. D. intemodia, Waters, sp. PI. II., fig. 31. 



Catenicella internodia, Waters, Q.J.Gr.S., Aug., 1881, p. 318 ; id. Aug., 1883, 

 p. 430. 



In this species the zooecia are arranged alternately in two rows, closely united 

 laterally and longitudinally ; the terminal zooecia of an internode are single. All 

 the specimens are more or less damaged, none representing an entire internode. 

 In some specimens there are 7 or 8 zooecia. The zooecia have a broad raised band 

 down the middle, with a groove in its centre. Each margin of the zooecium is 

 raised, leaving a depressed portion on either side of the central band, on which are 

 usually found a few small pores ; above the thyrostome there is frequently a band 

 stretching to the summit of the zooecium " with a small band to one side by which it 

 is sometimes replaced." Thyrostome, when perfect, rounded above, contracted below 

 the middle third by a small sharp process or denticle on each side, beneath which is 

 a broad pointed sinus. The upper and outer angle of each zooecium bears a large 

 avicularinm with triangular mandible opening directly forwards and with a sharp 

 upturned beak. The posterior surface is thickened round the margin, within 

 which is a lozenge-shaped depression deepest in the centre and having several small 

 pores. I have only seen one ooecium, shown in the figure ; the front is broken off. 



There are some points in Mr. Waters' description with which my specimens 

 do not agree, but they are of no specific value Thus, he describes an oval space 

 below the mouth surrounded by the division of the central band, and says that a 

 pore or corresponding mark is always present in the middle of this band. 



It is somewhat difficult to be certain of the systematic position of this species, 

 but I agree with Mr. Waters in placing it in the Catenicellidse. I, however, think 



