40 A M0N06RAT1I OF THE TERTIARY POLYZOA OF VICTORIA. 



18. 31. fossa, n.sp.. PI. Y., fig. 10. 



Zoariimi liil.-iiuinatc, tliick. Zocecia indistinct, nari-ow elliptical, Avitli thick 

 granular walls; aiuM-turo occujjying <|uil(' <ir nearly tlie whole area, contracted at 

 ihe jnuctieii of the ii])per and second ioni'lhs. 



^\.v. 



The specimens are not in a very good state of preservation, l)ut it seems distinct 

 IVoni aiiv desciihed s])ecies. The walls of the zoa'cia are continuous, flat and finely 

 granular, and the sejiarating line can only he defined with difficulty. The aperture 

 (corresjionding to n(>arly th(> whole anvi) looks as if punched out of a thick 

 calcareous layer. 



10. M. corhlrarr, n.sp. PL V., figs. 17, 18. 



Of this I have only two single zocecia. The upper portion is much enlarged, 

 ovate or rounded, with a thick margin within the hase of Avhich is, in one specimen, 

 a hroad internal plate; the lower part of the zoarium is narrow, fiat or depressed and 

 mucli prolonged. 



S.P.; M. 



The zoarium has prohahly heen hilaminate. The inferior plate is of the same 

 nature as the denticle or j)late found in some specimens of 31. dclicdlnla. 



20. 31. ambigua, n.sp. PL VI., fig. 12. 



Zoarium hilaminate. Zocecia elongated, somewhat quadrate or nearly liexagonal; 

 margins thick, raised, strongly granular, ahruptly sloping to the equally granular 

 lamina, which is very much depressed anteriorly, where it ends in a hroad, nearly 

 (piadrate, slightly iq)turned prolongation or plate Avith a distinctly thickened rim; 

 aperture occujiying ahout a third or a fourth part of the area and reaching on each 

 side to the margin ; avicularia intercalated among the zocecia, antei'ior extremity 

 pointed and raised, tlu> sides granular and sloping to an elongated opening. 



S.P. 



21. 31. bkJens, Busk, sp. PL YI., fig. 13. 



Membranipora bidciis. Busk, Crag Polyzoa, p. 31 ; 3Hcroporo hippocropis. 

 Waters, Q..T.G.S., 1882, p. 264. 



Zoai'ium hilaminate. Zon^cia alternate^ in regular linear series, quadrate, 

 (dongated; margins thick, granular ; lamina depressed, granular; aperture at the 

 extreme upper (Mid of the zoa'ciuin, shallow, the loAver edge turned forwards as a 

 broad denticle or plate, usually slightly hollowed in ihe middle and Avitli the margin 

 slightly thickened. 



