Zoology.-] NATURAL HISTORY OF VICTORIA. \Fo\yzoa. 



Plate 99, Figs. 1-3. 



RETEPORA GEANULATA (P. McG.)- 



Description. — Polyzoary massive, convoluted ; fenestra rounded, small, much 

 narrower than the interspaces ; cells elongated, separated by narrow, raised lines ; 

 mouth Arched above, straight below, lower lip with a narrow vertical sinus, on one 

 side of which is a rounded avicularium ; operculum much wider than high ; surface 

 of cells granular or tuberculate ; numerous small oval avicularia scattered over the 

 cells, and a few larger situated on rounded elevations; ovicell large, rounded, 

 granular; dorsal surface granular, vibicate, with small, scattered, rounded avicularia. 



References.— P. H. MacGillivray, Tr. Eoy. Soc. Vict., 1869 and 1882; 

 Hincks, Ann. and Mag. Nat. Hist., May 1878. 



Port Phillip Heads. 



This is the most massive of our Australian species, and attains 

 a large size, the specimen figured measuring four inches high by 

 the same width. It is of a brownish colour. In addition to the 

 usual granulations over the surface, in many cases there is a row 

 forming small processes on the upper margin of the mouth. The 

 young ovicell is fissured, the fissure becoming filled in as calcifi- 

 cation advances. In some specimens there are numerous rounded 

 avicularia scattered over the cells and ovicells, occasionally raised 

 on small elevations. There are also other large avicularia with 

 triangular mandibles on large mound-like elevations. 



Explanation of Figures. 



Plate 99. — Pig. 1, specimen, natural size. Fig. 2, portion of another specimen, magnified. 

 Fig. 3, portion to show the dorsal surface, magnified half as much. 



Plate 99, Figs. 4-8. 

 RETEPORA TESSELLATA (Hincks). 



Description. — Polyzoary small, foliaceous, convoluted; fenestra elongated, 

 usually narrower than the interspaces ; cells oval or rhomboidal, separated by narrow, 

 raised lines ; mouth higher than broad, with a projecting angle on each side, where 

 the raised cell-margin originates, caused by abrupt sloping backwards ; lower lip 

 deeply concave, entire, or with a minute rounded sinus ; operculum with a broad 

 groove down the centre j an avicularium on the front of the cell, with a long narrow 

 mandible ; ovicell rounded, sub-immersed, excavated below ; dorsal surface smooth 



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