MEDITERRANEAN AND NEW-ZEALAND EETEPOE^. 263 



the fenestrse are moderately uniform and about the size of typical 

 It. CoucJiii ; the ovicells are turned inwards at the lower border, 

 which is nearly straight and does not form a " lamina " ; there 

 are no oral spines ; in the oral aperture there is a small denticle 

 at each side. The operculum is very thin, and does not widen 

 out at the proximal edge in the same way as the Mediterranean 

 JR. cellulosa. There are no fenestral avicularia, and the vibices 

 are more or less parallel. 



In my Supplementary ' Challenger ' Eeport I referred to the 

 dorsal calcareous processes of Betepora growing over the chitinous 

 tubes of Caheria, and in the present species there are similar 

 rooting-processes growing over fibres of seaweed, also a few such 

 processes are thrown out from the front surface. 



Eetepora coMPLAJ!fATA, sp. nov. (PI. VI. fig. 21 ; PI. VII. 

 figs. 14-18.) 



This in most respects resembles R. cellulosa, but the dorsal 

 surface is much flatter and usually has the vibices more or less 

 parallel to the long axis of the fenestrse ; and from the Naples 

 and Capri specimens in my possession the zoarium seems to have 

 been but little convoluted. On the dorsal surface there is a 

 fenestral avicularium. 



One piece (PL VII. fig. 14) has an ovicell to each zoarium, 

 while another (fig. 18) has none, giving a remarkably different 

 appearance to the colonies. The sublabial pore is well developed, 

 and there is a spine at each side of the oral aperture. There is 

 no avicularium on the lower lip, but numerous small avicularia, 

 both oval and triangular, are scattered over the zoaria, also there 

 are a few large raised avicularia with narrow triangular openings. 



The opercula and mandibles are similar to those of R. cellulosa, 

 and perhaps this should only be considered a variety. 



Sah. Naples, 80 fath. ; Capri. 



Eetepora meditereanea, Smitt. (PL VI. figs. 14, 15, 16.) 



Ketepora cellulosa, forma Beaniana, var. mediterranea, Smitt, Krit. Fort, 

 ofver. Skand. Hafs-Bryozoer, Vetensk.Ak. Forhand. 1867, pp. 35, 202 note; 

 M.-Edwards in Cuvier, Reg. An., Zooph. pi. kxxvii. fig. 1 a-e (fide Smitt). 



Retepora cellulosa. Waters, Ann. <Sr Mag. Nat. Hist. ser. 5, vol. iii. 

 p. 199, pi. XV. figs. 1, 2 ; id. Trans. Manchester Geol. Soc. vol. xiv. p. 479. 



The zoarium is large, probably in most cases cup-shaped, chalky 

 white ; reticulations moderately regular ; branches round ; meshes 

 about 1-6 mm. long, 0'8 mm. wide ; branches about 0-8 mm. wide. 



