498 MR. A. W. WATERS ON 



good specific characters, and the way in which he has dealt with 

 them is one of the most important features of his book. 



Loc. Victoria [AlacG.) ; South Australia {iny coll.) ; a weed, 

 brought up on the sounding-line in the Red Sea, covered with this 

 species, was given to me by a passenger. We may take it that 

 there is every probability of its being from the Red Sea, though 

 we cannot record it as such without pointing out the possibility 

 of its having remained on the line from some previous locality. 

 Ohuaka Bay, Zanzibar, 2 fath. (509), collected by Crossland. 



Steganoporella magnilabris Busk. (PL LXXII. figs. 12-20.) 



Memhranijyora magnilabris Busk, Brit. Mus. Cat. Mar. Polyzoa, 

 p. 62, pi. Ixv. fig. 4, in the explanation of the plate called 

 M. grandis. 



Stega7ioporeUa ')nagnilahris Harmer, " Rev. of Gen. Siegano- 

 jwrella," Quart. Journ. Micr. Sci. vol. xliii. p. 279, pi. xii. fig. 10, 

 p'i. xiii. figs. 31, 44-46, which see for synonyms. Add Thornelj^, 

 " Mar. Poly, of the Indian Ocean," Trans. Linn. Soc, Zool. vol. xv. 

 p. 145. 



Specimens from Wasin agree in most respects with the descrip- 

 tion of this species, though the mandibles of the A zooecia having 

 no teeth are more like those of aS'. huskii Harm. However, a 

 comparison with the British Museum specimens has led to my 

 leaving them under magnilabris, though some workers might * 

 separate them as a variety. The zoaria are bilaminate, irregularly 

 contorted, and evidently attain to a very considerable size, as 

 some pieces, evidently only fragments of larger ones, measure 

 two or three inches across. 



There are very few B zooecia, in fact two mounts, each con- 

 taining about 300 zooecia, had no B zooecia. On examining ail the 

 remaining material a few scattered B zooecia were found, and it is 

 interesting to find that from these zooecia, which are somewhat 

 larger than most A zooecia, two new zooecia usually arise, that 

 is the row here bifurcates, and to this but few exceptions were 

 found in all the material examined. 



I called attention to this duplication from the B zooecia occurring 

 in some fossils, but Harmer f has shown that it is by no means 

 univei^sally the case. At the time I wrote very little material 

 was available for comparative study. It, however, is a fact that 

 in many species two zooecia usually, or at any rate frequently, 

 grow from the distal end of B the zooecia. In this species, when 

 the operculum is removed, it is often not possible to be sure which 

 are B zooecia, as there are large A zooecia, with a large shelf, in 

 all respects similar excepting the operculum, so that with fossils 

 there will often be uncertainty. In most other species there is a 

 greater difference between the A and B zooecia. The A opercula 

 vary considerably in size. In a specimen from (508) the B zooecia 

 are much more common than in those from (500). 



* " Bryozoa from Aldinga," Quavt. Jonni. Geol. Soc. vol. xli. p. 292. 

 t Revision of the geuus Stegaiwporella, p. 266. 



