22 A MONOGRAPH OF I'UK TERTIARY POLYZOA OF VICTORIA. 



S.P.; M.C. 



Named after my youngest daugliter. 



I suspect tliat AYatevs may hav(», probably from iiii perfect specimens, confused 

 tbis Avitli bis C. lotifjicollin, ovi^rlookiui;' \\u' absence of tbe (b'])ressed ril)be(l area, 

 and taking- the speeilic nam(> from tlie long- tul)ular connecting tu1)es wliicb are 

 much more mai'ked in tbe ))resent species. 



Ditaxij)ora, n.g. 



Zofrcia alternate in two configuous rows facing tbe same way, distinct but 

 closely united ; upper outer angle produced and ])()inted, bearing a sessile avicn- 

 larium witb long triangular mandible and sbari) upturned mucro. Ocecia large, 

 imbedded in the zooocia above. 



1. T). iiilrrnodia. Waters, sp, PI, TT., fig. 31. 



C,t/rtnrr//a iuh-nimli,!, W^atc-rs, Q.J.G.S., Aug., 1881, p. 818; /V/. Aug., 1883, 

 p. 430. 



Tn tbis species the zooecia are arranged alternately in two rows, closely united 

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

 the specimens are more or less damaged, none i-eprescnting an entire internode. 

 Tn som(> specimens there ai'c 7 or 8 zooecia. Tbe zoaxMa liave a broad raised band 

 down the mid(ll(>, witb a groove in its centre. Each margin of tbe zoa;ciu)n is 

 raised, leaving a de])ressed portion on eitlun* side of the central band, on which are 

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

 .stretching to tbe summit of tbe zooicium " with a small band to one side by which it 

 is sometimes replaced." Tbyrostoinc, when ])ei-fect, rounded above, contracted beh)w 

 the middle third by a small sbarj) process or denticle on each side, beneath Avhich is 

 a broad ])ointed sinus. The upper and outer angle of each zooecium bears a large 

 avicularium Avith triangular inaudible opening directly forwards and Avith a sharp 

 upturned beak. Tbe posterior surface is thickened round tbe margin, Avithin 

 which is a lozenge-shaped de})ression dee])cst in tbe centre ;uid iiaving several sni;ill 

 pores. I have only seen one ooecium, shown in tlie figure; the front is In-oken off. 



There are some points in Mr. Waters' description witb wbicii my specimens 

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

 l)elow tbe month surrounded by the division of the central band, and says that a 

 pore or corresiionding mark is always present in tbe middle of tbis band. 



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

 hut I agree Avith Mr. Waters in placing it in the Catenicelli(he. I, liowever, think 



