MILLEPORA. 85 



Porites furcata Lamk. 

 "\^eiy abundant, in shoal water down to 2 or 3 fathoms. 



Porites astrceoides Lamk. 



Very abundant. 



Of the numerous species of Porite.s enumerated by the authors, and 

 particularly by Duchassaing and Michelotti, as belonging to the West 

 Indian fliuna, I can identify but the three above species as found 

 in Florida. Porites clavaria and furcata are even rather difficult to dis- 

 tinguish by any constant characters derived from the calicle, as they 

 vary considerably in the same specimen. 



The numerous species described by Duchassaing and Michelotti I 

 have had no opportunity to study. Their genus Neoporites, for the 

 massive species of which P. astrceoides is a type, is a good subgenus. 

 The calicle presents sufficient differences, although the pali are not 

 really absent, but are represented by a tooth of the sejitum concealed 

 by the vertical edge of the latter. 



Oeder ACALEPILE. 

 Suborder HYDR0IDJ5 Johnst. 



Family MILLEPORIDiE Agassiz. 



MILLEPORA Linn. 

 Millepora plicata Esper. 



Millepora alckornis LixN., Pallas. 



M'dlcpora alcicornis, var. y, plicata EsPEK., Tab. VIII. 



Millepora complanata ? Lamk., Dana, M.-Edw. & H , Ducir. & Mich. 



Millepora foliata"? M.-Edw. & H., Ducn. & Mich. 



Millepora faveolata ? Duch. & Mich. 



Millepora striata Duch. & Mich. 



Millepora tuberculata? Duch. & Mich. 



This species is less common than 31. alcicornis. I have found it well 

 developed on the reef only, whilst the other is found everywhere. 

 Characters derived from the calicles or pores are apt to deceive ; still 

 in general, in this species, the larger calicles occupy the centre of a 



