Zoology.-] NATURAL HISTORY OF VICTORIA. \_Polyzoa. 



frequently produced into a slinr[) point at the centre of tiio lower lip. An avicularium 

 at the base of the zocccium, with a very long setiform mandible directed up one side 

 of the cell. 



Reference.— P. H. MacGillivray, Tr. Roy. Soc, Vict., Oct., 188'3, 



Port Phillip Heads. 



This species may be at once recognised by the peculiar avicu- 

 laria with the long setiform mandibles. 



ExrLANATioN Or Figure. 



Plate 1S7. — Fig. 5, {jroup of zou>cia. In all the lower lij) is smootli, but the peristome is 

 very frequently produced into a short, sharp, central process. 



Plate 187, Fia. 6. 

 CRIBRILINA MONOCEROS (Busk). 



Description. — Zoarium adherent or hemescharine. Zooocia with larj^e for- 

 amina, the Hiarn'ins of which are thickened; mouth large, the peristome of tlie lower 

 lip raised into a central jwinted process; occasionally two or three thin and furcate 

 spines on the upper margin of the nioutii ; a thick oral spine on one side of the 

 mouth, within the peristome. Otccia subimmersed, smooth, or with slight radiating 

 ridges, and frequently with two or more avicularia on elevations. Avicularia absent, 

 or numerous and very variable ; in some specimens scattered and usually close to the 

 sides of the zocccia, with sharp or blunt mandibles; in others very large, with large 

 acute or spatulato mandibles ; they are also found sessile on eminences round the 

 mouth, and one occasionally surmounts the inucronate elevation of the lower lip. 



References. — Busk, Brit. Mus. Cat., Mar. Pol. pt. ii., p. 72, pi. xciii., 

 figs. 5, 0; MacGillivray, Prd. Zool. Vict., pi. xxxv. 



Port Phillip Heads ; Portland, Mr. Maplestone ; Warrnambool, 

 Mr. Watts. 



Two distinct species seem to have been confounded under this 

 name, and I therefore give an amended description and an 

 additional figure of the true C. monoceros — that of Busk in the 

 British Museum Catalogue and myself in this work. 



Explanation of Figtjkb. 

 Plate; 1S7. — Fig. 6, zocecia and ocecia, showing the intra-peristoinial spine. 



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