General History of the Marine Polyzoa. 255 



tubular projections, with which probably some chitinous ap- 

 pendage may be connected. In the suture between the cells 

 are six rather large foramina, which pierce through the zoarium 

 and open out on the front surface, so that the zocecia may be 

 regarded as, to some extent, disjunct, and attached to one 

 another by six broad connecting processes. The connecting 

 portions (which are within the suture) are prettily areolated 

 or scalloped. 



Loc. Africa, Tahiti (Miss Jelly). 



Family Mernbraniporidse. 



Membranipora, De Blainville. 



Membranipora trifolium, form minor, Hincks. 



(PI. VIII. fig. 7.) 



[' Annals' for July 1880, pi. xi. fig. 6.] 



In the account of this variety in a previous paper I have de- 

 scribed the avicularium as pointed, but I had only a worn and 

 imperfect specimen to deal with, and I am now convinced that 

 this was an error. Miss Jelly has supplied me with a fine 

 example of the same form from Tahiti, in which the avicu- 

 laria are undoubtedly oval. In this respect it differs from 

 Membranipora trifolium. Busk, as well as in the greater 

 abundance of the avicularia (which are placed at the bottom 

 of the cells) and the smaller size of the zocecia. The ocecium 

 I have not seen. On the whole it seems better to regard it, 

 for the present at least, as a variety of the Crag species. 



Loc. Bahia ; Tahiti (Miss Jelly). M. trifolium has the 

 following range: — Great Britain (north); Labrador; St. Law- 

 rence ; Spitzbergen, Greenland, Norway ; Coralline Crag. 



Family Escharidae, Smitt. 



Lepralia, Johnston (part.). 



Lepralia yiyas, n. sp. (PI. IX. fig. 8.) 



Zocecia gigantic, quincuncially arranged, separated by deli- 

 cate raised lines, rather irregular in shape, often elongate 

 and rectilinear-oblong, or rounded and expanded above, nar- 

 rowing off towards the truncate base, sometimes comparatively 

 ehort, much depressed, almost perfectly flat ; surface covered 

 thickly with rather large punctures, which are surrounded 

 by small nodular risings ; orifice ample, placed some way 

 below the top of the cell (the border surrounding it strongly 

 granulated), arched above, the' lower margin curved slightly 



