38 CALCAREOUS ALGAE OF THE MIDDLE EAST 



Cylindroporella arabica Elliott 



(PI. 6, figs. I, 2) 



1957 Cylindroporella arabica Elliott : 227, pi. 1, figs. 13-16. 

 1962 Cylindroporella arabica Elliott ; Powers : 131. 



Description. This is the smallest of the Middle East species of the genus. C. 

 texana Johnson, of about the same age from the U.S.A., shows smaller dimensions 

 for internal structures but these occur in a very much longer slim segment. 



Horizon. Upper Jurassic of Arabia. 



Material. C. arabica occurs in the upper part of the Upper Jurassic, subsurface 

 Arab zone, in the Dukhan wells, Qatar, Persian Gulf, also at the same level in north- 

 eastern Saudi Arabia (Powers 1962), and in Gezira no. 1 well, Murban, Abu Dhabi, 

 Trucial Oman ; associated algae are Clypeina jurassica Favre and Salpingoporella 

 annulata Carozzi. It occurs at the same level, also with S. annulata, at Al Hamiah, 

 coastal Wahidi, Hadhramaut. 



Cylindroporella sugdeni Elliott 

 (PL 6, figs. 5-7) 



1957 Cylindroporella sugdeni Elliott : 227, pi. 1, figs. 1-6. 



Description. This species shows large, thick segments, with greater sizes for 

 internal structures than other species, if the Liassic C. ellenbergeri Lebouche & 

 Lemoine is excepted : this last differs in various characters from the more homo- 

 geneous later species. C. sugdeni is proportionally shorter and much thicker than 

 the type-species C. barnesii. 



Horizon. Lower Cretaceous of Middle East. 



Material. Described from the subsurface Lower Cretaceous of Fahud no. 1 well, 

 Oman, Arabia, where it was abundant. It occurs in Orbitolina-limestone of probable 

 Barremian-Aptian age at Wady Hajar and Wady Ghabar, Hadhramaut : also to 

 the north in the subsurface Lower Qamchuqa Limestone (Hauterivian level) of 

 Kirkuk no. 116 well, Iraq. 



Cylindroporella spp. 



There remain various records of indeterminate Cylindroporella, based on random 

 cuts in thin-section, obviously of the genus, but not diagnostic of a species : often 

 they are small in size. These have been seen in the Lower Cretaceous Qamchuqa 

 Formation of Chama, Mosul Liwa, northern Iraq ; subsurface in the same formation 

 at Barremian-Aptian level in Kirkuk well no. 116, and again at this level in the 

 Lower Cretaceous of Wady Arus, Hajar, Hadhramaut. 



Genus CYMOPOLIA Lamouroux 1816 

 Diagnosis. Thallus formed of consecutive hollow calcareous cylindrical bodies, 



