Adeonella (Laniiiiopora) contorta, d-c. 495 



than the ordinary zooecia, but the opercnhim fits into a 

 distinct sinus ; followin*; on this is Adeonella {Laminopora) 

 contorta, ^lich., a bilaminate erect species branching in 

 various directions, with short contorted bilaminate growths 

 springing at right angles from the main branches. It has 

 simih^r long narrow avicularia without any bar, long pore- 

 tubes, but no suboral pores, and a very long operculum. 

 This has most of tiie characters of" Schizoporella ; but there 

 are large embryos, in a thick sac, within goncecia not 

 externally larger than other zocecia, though in sections they 

 appear to be larger. The bodies now described in this paper 

 are fairly abundant and we have seen ihat they occur in 

 several other AdeonelUe. 



In Adeouellopsis there are three species with the same 

 sized tiat branching zoarium, the oral aperture the same size 

 and shape, and a small avicularium on one side just below 

 the aperture ; but the first, ^4. distoma, Busk, has an area with 

 stellate perforations, the second, A. subsu/cata, Smitf, has 

 one round pore, while .4. imperforata, Busk, has no pore. 

 This is not what we siiould have expected and creates a 

 difficulty in our classification, indicating that we must be 

 careful not to attach too much generic value to the structure 

 of the front wall. 



The embryos of the Adeonidae have not yet been described, 

 but in my forthcoming papers figures and descriptions of 

 some will be given. The species available have been 

 Adeona foUacea, var. fasci'alis, Kirchenpauer ; Adeonella 

 2?latalea, Busk ; A. lichenoides, Lamk. ; A. polymorpha, 

 Busk ; A. polystomella, Hincks ; A. contorta, Mich. ; AdeO' 

 nellopsis distoma. Busk ; and a new Adeonellop)sis from 

 Zanzibar : and all except Adeona foliacea, var., Adeonellopsis 

 distoma, and Adeonella polystomella, liss., have a large 

 embryo in a thick-walled sac, frequently filling up nearly 

 the whole zooecium. The embryo of Adeonella polystomella 

 is in a thick-walled sac, but it is smaller than the others. 

 In Lepralia cucullata*. Busk, which has an internal embryo, 

 the sac is thin-walled like the tentacular siieath ; and in 

 Lepralia f and Schizoporella there are many cases in which 



* Waters, " Mar. Biol, of Sudanese Red Sea," Bryozoa, Journ. Linn. 

 Soc, Zool. vol. xxxi. p. 150, pi. xv, fig. 4 (1909). 



t Among others the following have the ovicelligerous zooecia larger 

 than other zooecia : — 



Lepralia depressa, Busk. 



Lepralia histata, Waters, fossil 



from New Zealand. 

 Lepralia cincta, Hincks, but with 



an ovicell. 

 Schizoporella subimmersa, MacG. 



Monoporella waiptikerends, Waters. 



Hipporina, Neviaui. 



HippotJwa. 



Caleschara. 



Many Catenicellidae. 



