MADREPORARIA WHITELEGGE. 353 



Very common at low water in the lagoon and on the outer 

 reefs. 



ASTHMA DAN-fli, Edwards & Haime. 



Favia dance, Edwards & Haime, Hist. Nat. Corall., ii., p. 442. 

 Astrcea porcata, Dana, Zoophytes, U.S. Explor. Exped., p. 226, 



pi. xi., fig. 5. 

 One specimen. 

 Common in the lagoons and on the outer reefs. 



DENTICULATA, Ellis & SolandffT. 



Madrepora denticulata, Ellis & Solander, Nat. Hist. Zoophytes, 



p. 166, pi. xlix., fig. 1. 

 Four specimens. 

 Abundant on the reefs. 



ACANTHASTR^EA PATULA, Dana. 



Acanthastrcea patula, Dana, Zoophytes, U.S. Explor. Exped., p. 

 209, pi. x., fig. 14. 



One small example. 



The calicles are subcircular, oblong, or polygonal and very 

 unequal in the size of the fossa, and also in the relative thickness 

 of the walls. The former measure from 5 to 10 mm. in diameter, 

 the latter from 2 to 6 mm. in thickness. The septa vary in num- 

 ber from twelve to thirty-six. 



The columella consists of a series of compressed denticles, 

 frequently more or less connected. 



Among loose stones on the lee side of the atoll. 



ACANTHA8TR.EA ECHINATA, Dana. 



Acanthastrcea echinata, Dana, Zoophytes, U.S. Explor. Exped., p. 

 229, pi. xii., fig. 1. 



A single specimen in spirit is in the collection. 



The larger calicles are about 9 mm. in diameter. The third 

 cycle of septa is incomplete. The septal spines are from 2 to 3-5 

 mm. in height. 



Colour dark blackish brown. 



Occurring with the preceding. 



LEPTASTR,EA 80LIDA, Edwards & Haime. 

 Leptastrcea solida, Edwards & Haime, Hist. Nat. Corall., ii., p. 



512, pi. D 8, fig. 2. 



Four specimens of this species were obtained. All are incrusting 

 and assume the shape of the object they have invested, forming 

 irregular nodular masses without any points of attachment. 

 Occurring among loose stones on the lee side of the reef. 



