hill: geology of Jamaica. 149 



There are also two or three specimens of a large form which are either 

 Operculina or Heterostegina. Jones has reported^ the latter genus from 

 the same horizon as that of the "shells and corals lately brought to 

 England by L. Barrett, and described by J. Carrick Moore and Duncan," 

 in a collection which was clearly from the Bowden formation. 



Bryozoa. — The Bowden gravel bed contains numerous specimens of 

 a species of Lunulites, associated with the corals, Foraminifera, and 

 Mollusca. This form attains a maximum size of half a centimeter. 

 Dall has also reported^ Membranipora savorti Audovon, from the 

 "Oligocene of Jamaica." 



In the Bowden beds is a varied fauna of simple corals. These in 

 association with Foraminifera, Bryozoa, Pteropods, and other Mollusca 

 occur in vast quantities in the gravel and marl at the foot of the bluff 

 at Bowden, and sparsely in the marl at Bull' Bay. They have also been 

 reported by Duncan from Yere, the Clarendon coast, and from Navy 

 Island off Port Antonio ; and erroneously reported from " Upper Clar- 

 endon " by other writers. ^ 



During our expeditions we made a large collection of corals from the 

 Bowden locality and these have been carefully restudied by Vaughan, 

 who adds several to the number of species. He reports the follow- 

 ing species from Bowden: Thysanus excentricus, Duncan; Thysanus 

 elegans, Duncan ; Placotrochus costatus, Duncan ; Placocyathus barretti, 

 Duncan ; Placocyathus moorei, Duncan ; Trochocyathus profundus, 

 Duncan; Lithophyllia ponderosa (Duncan), (non Montlivaltia ponde- 

 rosa, Edwards and Haime) ; Circophyllia walli, (Duncan) ; Asterosmilia 

 sp. ; Teleiophyllia probably grandis, Duncan ; Porites sp. cf. furcata ; 

 Porites sp. of the astrscoides type, but with larger caiices ; Madre- 

 pora sp. 



In addition to the species of coral previously described from Bowden 

 by Duncan, Vaughan notes that our collection '' is especially interesting 

 because it contains two determinable species of Porites and one of 

 Madrepora, none of which have previously been described," and "which, 

 if in situ, contribute rather important information concerning the condi- 

 tions under which the Bowden beds were deposited." 



Concerning the corals collected by us from the Bowden horizon at 

 Buff Bay, Vaughan reports that " it contains a specimen of Placocyathus 

 barretti J Duncan, and an undescribed species of Dendrophyllia.'' 



1 The Geologist, 1864, Vol. VII. p. 105. 



2 Proc. U. S. National Museum, Washington, 1896, Vol. XIX. No. 1110, p. 329. 



3 See Appendix to Jamaican Keports. -' 



