1863.] DUNCAN WEST INDIAN COEALS. 449 



II. San Domingo. 



The genera are very numerous, and include many simple corals. 



Astrcea, Stephanoccenia, Alveojpora, and Moeandrina are represented 

 here as well as in Antigua. 



The great Astrcea endothecata, whose varieties at Antigua have 

 been noticed, nourished formerly in the coral-reefs of San Domingo ; 

 it is characterized by the extraordinary development of its endotheca, 

 and is only second in size to the great Astrcea crassolamellata of the 

 Marl of Antigua. Considering that several forms of Astrcece at 

 Montserrat and Antigua are more or less structurally related to 

 the great Astrgean of San Domingo, it is necessary to examine the 

 Astraeans of the European Miocene seas for their alliances, especially 

 as the Testacea of the Nivaje and Esperanza shales have a mid- 

 tertiary facies. 



It is, then, provisionally that I collect the AstrEeans with an un- 

 usual development of endotheca into a subgenus, as follows : — 



{Astraea Ellisiana. Dax, Turin, &c. N 

 Reussiana. Yienna. 

 Raulini. Leognan. }■ Miocene. 



— Defrancii. Bordeaux and Turin. | 



— vesiculosa. Dax. J 



— cellulosa, et var. 1 



— endothecata, var. I Antigua. 

 Antiguensis. J 



— Antillarum. Montserrat. 



•, ,-, , f San Domingo, Miocene. 



— endothecata. -{ , T . o i>-r> • * 



[_ Miocene i ot .Persia * c 



Forskselana. Red Sea and West Indian Seas, recent ; sub- 

 fossil in Egypt. 



The species are placed according to their affinities. 



The range of species closely allied to Astrcea exotliecata is from 

 the Miocene of Europe and of the East and West Indies to recent 

 times, the only existing form being common to the Red Sea and the 

 Caribbean. 



Astrcea cylindrica is a very interesting form, as it has not been 

 found elsewhere than in the Nivaje shale ; it resembles somewhat 

 the recent Astrcea cavernosa of the Antilles, and Astrcea costata 

 of the Marl of Antigua ; it differs from A. Forskcelana in the deve- 

 lopment of the endotheca and the rather cribriform septa. 



Stephanoccenia is found in a ramose form; its presence in San 

 Domingo is interesting on account of a species having been found in 

 the Chert of Antigua, the geologic age of which is uncertain. 



Aheopora fenestrata is found fossil ; it is now common as a reef- 

 coral in the South Seas ; but although Alveopora Dcedalcea and its 

 varieties also occur fossil in Antigua and in Jamaica, still there are 

 no species of the genus in the present Caribbean Sea. 



Barysmilia, which has a species at Le Mans (Greensand), at Gosau, 

 and also at Uchauxf, is a well-marked genus; the species in the 

 yellow shale at Esperanza, San Domingo, is clearly intermediate be- 

 tween the other forms. 



* See a specimen in the British Museum. t Edwards and Haime, op. tit 



