462 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



shreds of epitheca. Costae of base, low, rather crowded, subequal, 

 with clearly visible synapticulae between them. 



Calices very shallow, quite or almost superficial, with margins rang- 

 ing from flush with the intercorallite areas up to 3.5 mm. or more in 

 height. In some corallites the free limb on the lower side is from 

 6.5 to 9 mm. long, while the margin of the upper side is only slightly 

 elevated. The calicular outline is subcircular or broadl}^ elliptical; the 

 diameter ranges from 6 to 1 mm., 8 to 9 mm. usual for fully developed 

 calices. Distance between calicular rims ranges from 4 to 13 mm. 

 Intercahcular area flattish except near the peripheries of the calices 

 where they slope upward rather steeply if the calices are elevated. 

 Septo-costae correspond to all septa and are subequal at the calicular 

 margins ; lower down they are either subequal, low, broad, and with flat- 

 tish or rounded summits, or they alternate in prominence ; where there 

 is such alternation the edges are usually acute. Transversely com- 

 pressed granulations on some septo-costae, but usually the margins 

 are almost smooth. The septo-costae are confluent between adjacent 

 corallites or meet at a sharp angle; outer limits of corallites usually 

 marked by a circumscribing ridge that joins adjacent septo-costae. 

 Synapticulae distinct between the septo-costae, in both transverse and 

 longitudinal sections. WaUs with synapticulae near the upper edge. 



vSepta thick, lanceolate, in the wall, rapidly thmning within the 

 calicular cavity. In a calice 8 mm. in diameter there are 38 septa, 

 every other one of which extends to the columella. There are strongly 

 developed, thick, prominent pali on the inner ends of all unbroken 

 long septa, obscurely arranged in two crowns. Unless decidedly small 

 the septa of the last cycle fuse to the sides of the septa of the next 

 lower cycle ; in some systems tertiaries fuse to secondaries and quar- 

 ternaries to tertiaries. Septal margins subentire or obscurely dentate. 

 Usually the lamellae are solid, but broken transverse sections of the 

 corallites of a specimen not the type show some perforations. Syn- 

 apticulae well developed. 



Columella large, coarsely trabecular, in the center of the shallow 

 flat-bottomed calice. 



Asexual reproduction b}^ intercalicular gemmation. 



Locality and geologic occurrence. — Anguilla, at the following stations : 

 6962, 1 mile northeast of Boat Harbor (type); 6893, Crocus Bay, 

 on roadside from VaUey Post Office down the bluff (7 specimens); 

 6894, west side of Crocus Bay, probably from the lower part of the 

 exposure (paratype); 6963, west side of Sandy Hifl (2 specimens), 

 collected by T. W. Vaughan. Professor Cleve obtained at least 

 one and I obtained 11 identifiable specimens of this species in Anguilla. 



Type.— No. 325250, U.S.N.M. 



Paratype.— No. 325248, U.S.N.M. 



