72 MANICINA. 



MYCETOPHYLLTA M.-Edw. & II. 



Mycetophyllia Lamarckana Edw. & II. 



Rather rare. I have found it living on the reef at Looe Ke}\ and 

 dredged it up from five fathoms in the channel at Key West. 



Mycetophyllia Danaana Edw. & II. 



Several worn specimens in the Museum are referred to this species : 

 also a young one obtained living by myself. 



MUSSA Oken. 



Mussa angulosa Oken. 

 Rare. 



Mussa caiduus Dana. 

 Rare. Worn specimens. 



MANICINA Ehrbg. 

 Manicina areolata Ehrbg. 



Very common from about three feet below low-water mark to five or 

 six fathoms, chiefly in sheltered places. It is particularly abundant on 

 sandy or muddy Hats, partly overgrown with sea-grasses (Thalassia), in- 

 side the reef. The young when developing normally assume a very 

 elongated form with wavy sides, which soon form six lobes, two of 

 them forming the ends: but the primary or secondary septa are not 

 enlarged, as in Isophvllia. to form the partitions between the lobes. 



Although a great diversity prevails in the adults, with regard to the 

 general shape. I can find no specific differences among the large number 

 of specimens examined. I have not seen authentic specimens of the 

 other species enumerated by the authors as found in the West Indies : 

 but from the descriptions I can see no good reason for admitting more 

 than one Wot Indian species. 



