24 MR. A. "W. WATERS OK THE MARINE 



form a semispiral foliaceous growth round the main branch. The specimens 

 under consideration, and those seen in various museums, are generally violet 

 or red, but the colour is not mentioned by Calvet in Gemellipora arbuscula, 

 nor are the frequent and short branches, but, as young and even older 

 colonies of A. contorta are known without this branching, I consider that it 

 is probably a synonym. It may be well to call attention to the fact that tbe 

 Adeonidse are nearly all darkly coloured, but specimens bleached quite white 

 are often seen. There is an interesting specimen of Adeona in the British 

 Museum quite white on the one side, though very dark on the other, it 

 evidently having been exposed to the light. 



The zocecia are raised when quite young, but are depressed when older. 

 There is an avicularium on one side, sometimes on both, at about the level of 

 the oral aperture. The oral aperture is elongate with a long sinus and 

 denticles just above the sinus. The zooecia are small and may be entirely 

 filled up by the embryo, which is about 0*25 mm', long, and, so far as I have 

 seen, there is no external indication as to which are gonoecia. 



The older opercula often have a raised tubercle on the front, about the 

 middle, and sometimes there is a calcareous layer over the operculum, 

 forming what has been incorrectly called a calcareous * operculum — from 

 this arises the calcareous tubercle. In many of the Cheilostomata a 

 calcareous layer may be formed over the older opercula, and this has been 

 dealt with on page 15. It does not seem right, in any case, to speak of a 

 calcareous operculum. 



There are about 13-15 tentacles, and all the Adeonidaa examined have 

 about this number, namely, A. platalea, Busk, 13 ; A.polystomella, Reuss, 16 ; 

 A. polymorplia, Busk, 15 ; A. lichenoides, Busk, 14 ; Adeonellopsis distoma, 

 Busk, 14-16 ; A. Crosslandi, Waters, 13-14. 



In my paper on Adeonella contorta, on page 493, the characters are given 

 of the group dealt with by Busk as Adeonella. 



Loc. Evidently abundant from the Cape Verde Islands, and, as stated in my 

 paper referred to, it appears to occur in the Red Sea; the John Adams 

 Bank, Brazil, and ? Cape St. Vincent f, Spain; St. Vincent, Cape Verde 

 Islands, 5-20 fath., collected by Crossland. 



Crisia. 



When this paper was almost finished Harmer's valuable 'Siboga' Report 

 was published, and as I was not sure how far I agreed with him upon some 



* See page 15. 



t I wrote asking- Mr. Kirkpatriek if there was any possibility of the British Museum 

 specimen from " Cape St. Vincent, Spain," having' come from St. Vincent, Cape Verde Is., 

 and he kindly replied that it was ' Rattlesnake ' material, purchased through a dealer, and 

 that 5 fath. looks like offshore at Cape Verde, not St. Vincent, Spain, and that there was 

 probably a sale catalogue mistake. 



