Zoology.1 NATURAL HISTORY OF VICTORIA. IPohjzoa. 



Plate 187, Fig. 7. 



CRIBRILINA ACANTHOCEROS (McG.)- 



Description. — Zoarium adherent. Zocecia with large foramina; mouth large, 

 lower lip straight, without mucro; a large spine, very long, and with sharp secondary 

 spines or prickles directed upwards, immediately below the lip and to one side. 

 Oa3cia subimmersed, usually with a small mitriform smooth space below, and several 

 large perforations round the upper margin. Frequently a large avicularium, with 

 triangular mandible, at each side of the mouth towards the angle. 



Reference. — P. H. MacGillivray, Tr. Roy. Soc. Vict, July, 1886. 

 Port Phillip Heads ; Portland, Mr. Maplestone. 



This differs from C. monoceros in the follomng points : — The 

 lower lip is straight and the peristome is not developed into a 

 mucro ; the ocecium is somewhat different ; and especially the 

 situation of the azygos oral spine is different. In C. monoceros 

 it is always situated at one side of the mou.th, close to the margin 

 above the angle and is enclosed within the peristome when 

 that is developed. In C. acanthoceros the spine, besides being 

 very long and furnished with the peculiar armature, is situated 

 below the lower lip, and if a peristome should be developed, which 

 I have never seen, would be outside it. 



Explanation of FionRE. 

 Plate 187. — Fig. 7, two zocecia, showing oral spines and avicularia. 



Plate 187, Figs. 8 and 0. 

 HIPPOTHOA DIVARICATA (Busk). 



[Genus HIPPOTHOA (LAMOURonx). (Sub-kingdom llollusca. 

 Infundibulata. Sub-order Clieilostomata. Family Esch.arida;.) 



Class Polyzoa. Order 



Gtn. Char. — Zoarium aduate. Zocecia distant, connected by creeping tubes so as to form 

 linear series, or partly clustered in small patches; mouth with a sinus in the lower lip.] 



Description. — Zocecia connected by short thick tubes, pyriform, usually 

 carinate, smooth or finely striated, or transversely annulated or corrugated ; mouth 

 with a slight notch in tlie lower lip. Oa-cium surmounting a zooecium, rounded, 

 smooth, or slightly carinate, or with a rounded umbo. 



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