MADREPORARIA WHITBLEGGE. 355 



FAMILY CYCLOSERID^. 



PSAMMOCORA F088ATA, Dana. 



Psammocora fossata, Dana, Zoophytes, U.S. Explor. Exped., p. 

 347, pi. xxvi., figs. 2, 2a. 



Two specimens: one explanate, convex, with a large free epithe- 

 cate margin exhibiting concentric lines of growth on the lower 

 surface ; the other a roll-like form incrusting a dead piece of 

 coral. The meandering calicine valleys are mostly short, con- 

 taining from two to six calicles ; near the margins of the corallum 

 as many as twelve may be found in one valley. 



The ridges are rounded, and somewhat strongly echinulate. 

 The septa vary in number from twelve to thirty-six; their summits 

 are thick and echinulate. The echinulae are arranged transversely 

 in subquadrate groups, about 0-2 mm. apart at the apex. 



The columella is small, and consists of a few spiniform granules. 

 Obtained in the lagoon. 



PSAMMOCORA CONTIGUA, Esper. 

 Madrepora contigua, Esper, Die Pflanz., i., 1797, Suppl., p. 81, 



pi. Ixvi. 

 Psammocora . plicata, Dana, Zoophytes, U.S. Explor. Exped., p. 



346, pi. xxv., fig. 2. 



Two fine specimens of this species were obtained at low tide 

 mark on the western side of the atoll. 



OXYPORA, sp. 



A small fragment was obtained in from forty to seventy fathoms 

 outside the atoll. Its condition, however, is such as to preclude 

 the possibility of specific identification. 



FAMILY FUNGID^E. 



FUNGIA TENUIDENS, Quelch. 



Fungia tenuidens, Quelch, Chall. Rep., Zool., xvi., p. 138, pi. vi., 



fig. 1. 



One example, similar in size, shape, and general characters to 

 the specimen figured in the " Challenger " Report. 

 Occurring on the western side of the atoll. 

 FUNGIA DISCUS, Dana. 

 Fungia discus, Dana, Zoophytes, U.S. Explor. Exped., p. 291, pi. 



xviii., fig. 3. 



A single beach-worn example is referable to this species. 

 Western side of the atoll. 



