﻿460 



BULLETIN lO.S, UNITED STATES NATIONAL MUSEUM. 



Syiiapticulae present, especially near the columella. Endotlieeal 

 dissepiments highly developed and vesicular. 



Locality and geologic occurrence. — Antigua, station 6854, Rifle 

 butts, Antigua formation, collected by T. W. Vaughan. 



Type.—'^o. 325218, U.S.N.M. 



This species is dedicated to His Kxcellency vSir H. Hesketh Bell, 

 Governor of the Leeward Islands at the time I collected in Antigua 

 and other Leeward Islands. It was to his helpfulness that the 

 success of my work was largely due. 



On page 389 of tliis paper attention is directed to the resemblance 

 l)ctween Orhicella costata (Duncan) and Gyathm)iorflui helli. 



CVATHOMORPHA SPLENDENS, new species. 



Plate 128, figs. 2, 2a, 'lb. 



Oorallum unifacial, calices on the upper surface; base naked, with 

 wide, low costae. Maximum thickness of type 24.5 mm.; thickness 

 to base of corallite 15 mm. 



Calices shallow, but excavated; diameter, 17.5 by 20 mm.; margin 

 elevated 4 mm. on one side, 9 mm. on the other side. Strong subequal 

 costae correspond to all septa except those that are rudimentary. 



Septa 54 in number, the quinarics rudimentary; primaries and 

 secoiularies larger than the septa of higher cycles. 



Columella large, 8 mm. in diameter, surface coarsely papillate. 



Dissepiments greatly developed; syiiapticulae present. 



Locality and geologic occurrence. — Antigua, station 6854, in the 

 Antigua formation, Rifle Butts, collected by T. W. Vauglian. 



Type.—^o. 325219, U.S.N.M. 



The description of this species is brief, because a more elaborate 

 one would be largely a repetition of what has been said under the 

 four preceding descriptions. The most nearly related species is 

 G. helli, from which it differs by the wider and lower costae of its 

 lower surface, its much larger calices, and, in comparison with the 

 size of the calices, its fewer septa. 



CVATHOMORPHA ANGIIILLENSIS, new species. 



Plate 127. figs. 1. 2, :^, 4, 5. 



This species is usually characterized by its large, distant, and prom- 

 inent calices. 



Dimension of calices of Cifathomorpha unguillensis. 



