General History of the Marine Polyzoa. 287 



Locality. Port Elizabeth, South Africa (Miss Jelly). 



In some respects the present species resembles Flustra 

 denticulata, var. inermis, Busk, of which there is a figure 

 both in the ' British Museum Catalogue ' * and the ' Chal- 

 lenger ' Report f. But the differences between the two are 

 sufficiently important to warrant their separation. The habit 

 of the zoarium, which in Busk's species is composed of simple 

 " linear branches/' is strikingly unlike that of the present 

 form. The zooecia in the var. inermis are entirely destitute 

 of spines, or are merely furnished with a single " small 

 upturned spine " on each side of the mouth, while the avicu- 

 laria of the two species differ markedly in shape (PI. VI. 

 figs. 1 c, d). The internal denticles are present in both. 



It may be a question, I think, whether the variety inermis 

 is not specifically distinct from F. denticulata. 



Ortmann, in his interesting Report on 'Japanese Bryozoa'^:, 

 has described and figured a species {Garbasea rhizophora) 

 belonging to the section of the genus in which the zooecia are 

 disposed on one side only of the zoarium [Garbasea of authors), 

 which in some points bears a notable resemblance to the 

 present form. In shape and arrangement the cells of the 

 two forms are identical, but there are no lateral spines nor is 

 any mention made of internal denticles ; the ooscia present the 

 same characters, being in both cases furnished with the bar 

 across the front ; the same may be said of the avicularia — 

 they offer, so far as I can see, no points of difference. The 

 zoarium, however, besides having the cells on one side only, 

 is decumbent and attached by tubular fibres given off from 

 the dorsal surface. The resemblances are certainly remark- 

 able, and the two forms must be regarded as very nearly 

 related. 



In the present species the side-walls of each zooecium are 

 furnished with a number of circular pores (communication- 

 pores) which form a line extending from one end of the cell 

 to the other, a little below the internal denticles. A similar 

 structure has been noticed by Busk in F. denticulata, var. 

 inermis ; but he states that it is only met with in the marginal 

 zooecia. 



Abnormal cells of peculiar form and destitute of orifice occur 

 occasionally (PI. VI. fig. lb). 



* B. M. Cat. vol. i. p. 49, pi. xlix. figs. 3, 4. 

 t ' Challenger ' Report, part i. p. 53, pi. xxxii. fig. 2. 

 % " Die JapanLsche Bryozoenfauna,'' von Dr. A. Ortmann, Archiv f. 

 Naturgescliichte, Jahrg. 50, i. Bd., 1 Heft (1890). 



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