460 



BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Synapticulae present, especially near the columella. Endotliecal 

 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 Excellency Sir H. Hesketh Bell, 

 Governor of the Leeward Islands at the time I collected in xA.ntigua 

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

 success of my work was largely due. 



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

 between Orhicella costata (Duncan) and CyatJiomorplia belli. 



CYATHOMORPHA SPLENDENS, new species. 



Plate 128, figs. 2, 2a, 2h. 



Corallum 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. 



CaUces 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 quinaries rudimentary; primaries and 

 secondaries larger than the septa of higher cycles. 



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



Dissepiments greatlj^ developed; synapticulae present. 



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

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



T^/^e.— No. 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 Avith the 

 size of the calices, its fewer septa. 



CYATHOMORPHA ANGUILLENSIS, new species. 



Plate 127, figs. 1, 2, 3, 4, 5. 



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

 inent calices. 



Dimension of calices of Cyathomorpha anguillensis. 





1 



2 



3 



4 



5 



6 



7 



Greater diameter 



mm. 

 18.5 

 14.5 



inm. 

 15 

 14.3 



mm. 

 12 

 12 



mm. 

 14.5 

 12.0 



mm. 

 15 

 14 



mm. 

 14 

 12.5 



mm. 

 11 



Lesser diameter 



9 o 







