A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 37 



sloping abruptly downwards and inwards, strongly granular, the granulations 

 arranged in centripetal rows ; aperture occupying almost tlie whole of the area, its 

 edges crennlatcd ; avicularia very large, replacing zooecia, a granular and ridged 

 calcareous lamina sloping iuAvards, very largely developed in the mandihular portion, 

 where it occupies more than half of the cavity, much narrowtu- in the posterior 

 portion, a stout arched calcareous bar dividing the two parts ; occasionally other 

 smaller avicularia intercalated among the zooecia. Ooecia prominent, the proximal 

 margin thickened and with a narrow raised band extending upwards. 



S.P.; M.C. 



This beautifu^l species is allied to 31. cvassimarginata (Busk), from which it 

 differs in the structure of the oa?cium and especially in the mandibular part of the 

 avicularium, being largely filled in by the sculptured calcareous lamina. 



10. M. fjeminata, Waters. PI. V., fig. 2. 



3Iembraitipora (jcmiiiata, Waters, Q.J.G.S., 1881, p. 325. 



Zoarium adnate or bilaminate and branched. Zooecia elliptical, alternate or 

 irregularly arranged ; margins raised and thick, Antli a series of about 20 spines ; 

 a very narrow lamina sloping abruptly inwards ; a^^erture occupying almost the 

 whole of the area ; frequently a slight extension of the zooecium downwards below 

 the margin of the area ; avicularia (frequently absent) rounded, on the margins 

 usually below and to one side of the zooecium. At the ui)per extremity, inside the 

 apertiu-e, there is a sloping calcareous plate with a depression on each side. 



S.P. ; M.C. ; B.R. ; M. ; C.C. (W.) 



11. M. dejyressa, n.sp. PI. V., fig. 3. 

 Memhvonipora maorica, Waters, Q.J.G.S., 1881, p. 325. 



Zoarium usually cylindrical in Vincularia form, but occasionally broad and 

 bilaminate. Zocfcia large, broad, rounded above ; margins thick and granular, with 

 a granular lamina sloping from the edges to the much depressed centre ; aperture 

 occupying about one-third of the area, rounded above, straight below, slightly 

 contracted at the sides which are granular or crenulated ; avicularia intercalated 

 among the zooecia in separate granular areas, mandible very long, pointed upwards. 



S.P.; Bel.; C.C. (W.). 



This species was referred by Waters to Stoliczka's Vincularia maorica, a 

 determination with Avhich I cannot agree. Waters himself subsequently gives 

 Stoliczka's species as identical with Eschara se.vanyularis (which he includes in 

 3IonoporeUa), to which he also refers T. Wood's E. clarkei, and proposes that the 

 present form should be named var. minima or tuberculata, Q.J.G.S., 1885, p. 291. 



