Actinozoan Nature <?/" Millepora alcicornis. 



359 



by the tubular cylindrical tissue (fig. 1). It is evident that 

 Agassiz saw young, ill-developed, and probably injured 

 polyps which had not attained their second row of tentacles. 



The number of tentacles may be therefore 4, 8, 12, &c. The 

 tentacles were not noticed to be pinnate *. 



In looking at this description there is a probability that 

 Millepora is an Alcyonarian ; and there is no proof that it is a 

 Hydroid. The arrangement of the sclerenchyma will prevent 

 the species being classified as Madreporarian. 



Fiff. 1. 



Fiff. 2. 



Fig. 3. 



m ^A 



'\. 



Fig. 1. Expanded polyp of Millepora alcicornis : a, side view (in some in- 

 stances there are five or six whorls of tentacles) ; b, view of top. 

 Fig. 2. CoraUum with expanded polyps. 

 Fig. 3. The tubular cavities of the corallum. 



From drawings by Lieut, (now Major-General) Nelson, R.E. 



* Pinnate tentacles are not peculiar to Alcyonarians. Octdina diffusa 

 of Bermuda has them. 



