ir> "Mv. A. ^l\' . Waters on Bryozoafrom 



been from dried specimens. The radicle is small, occurring 

 about the middle of the zooecium. 



Most Beanue have six tubular connexions, whereas this 

 lias only t'ttur, and in some respects recalls the growth of 

 PaUidicella. 



There are 20 tentacles. 



Hab. Ta'smania {H'lncks) ; Port Phillip Heads (MacG.) ; 

 Napier and Wellin2;ton [Hamilton) ; Maunganui, Chatham 

 Island. 



Hiantopora monoceros (Busk). (PI. I. fig. 11.) 



For sjnonyms, see Miss Jelly's Catalogue, and Waters, Expt^d. Ant. 



Belgp, Bryozoa, p. 42. 

 Cn'hrUijia monoceros, Calvet, Brvozoen, Ilamb. Mngal. Sammelreise, 



p. 1.;. 



The protecting calcareous wall on the front is formed by 

 irregular large calcareous processes arising from the margins 

 of the zooecium, and these meet, leaving the large round 

 pores open. The proximal margin of the oral aperture is 

 not always formed first, as stated by Hincks, but may be 

 closed in last, as seen in the left-hand zooecium (fig. 11, a), 

 though in any case this margin is formed by a growth from 

 the two sides coalescing. 



In most incrusting forms, such as Lepralia, Schizoporella, 

 Smittia, &c., there is a membrane over the whole of the 

 front, and in this the calcareous wall grows regularly, leaving a 

 suboral free space, which gradually becomes smaller, through 

 the formation of calcareous deposit. As is well known, the 

 basal and lateral walls are formed first, and it is only later that 

 the zooecia are separated off by the proximal walls. Norman "^ 

 has given some interesting details concerning the growth of 

 the front wall in Cribrilina, and it is a subject inviting 

 further study. In C. Balzaci, Aud., and C. 7-adiata, Moll., 

 the growth takes place regularly from the side, leaving an 

 oval space free. 



There are 17 tentacles. 



In some Chatham-Island specimens there are usually 

 three large pores, whereas H. monoceros usually has several, 

 though, as they correspond in other respects, I have not 

 separated it from monoceros. There is little doubt that this 

 ii the Hiantopora Liversidgei of MacGillivray f. The figure 



* '* Notes on the Natural History of East Finmark," Ann. k, Mag. 

 Nat. Hist. ser. 7, vol. xii. p. 101. 



+ " Monograph of the Tertiary Polyzoa of Victoria,'' p. 02, pi. ix. 

 figs. 21, 22, Trans. Roy. .Soc. Vict. vol. iv. 



