Actinozoan Nature o/'Millepora alcicornis. 



359 



by the tubular cyliudrical 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. 



Tier, 3. 



Fig. 1. Expanded pulvp of MiUeporn cUciconns : a, side view (in some in- 

 stances there are five or six wliorls of tentacles) ; b, new of top. 

 Fig. 2. Coralhim with expanded polyps. 

 Fig. 3. The tubular cavities of the corallum. 



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



• Pinnate tentacles are not peculiar to Alcyonarians. Octthna difusa 

 of Bermuda has them. 



