100 



M.K. HOWARTH 



PLATE 24 



Figs 1, 3 Paracenoceras meridionale Tintant, 'Nautiloid Bed', 23 m below top of Shuqra Formation (fauna 1 ), central Jebel Billum. la, lb, CN72, 



phragmocone. 3, CN69, septal surface showing whorl cross-section, xO.6. 

 Fig. 2 Parace«ocerai cf. ca//ov;e«ie (Oppel), upper part of Shuqra Formation (fauna 1), 1 km east of Al Ma' abir road/river crossing. 2a, 2b, CN73, 



phragmocone. 



arched venter at 75 mm diameter. European examples ofP. calloviense 

 have been described by Tintant ( 1 969), and large specimens (Tintant's 

 macroconchs) do have sulcate venters, though the sulci are shal- 

 lower than in P. meridionale. The species does not occur above the 

 Callovian. 



Occurrence. Upper part of the Shuqra Formation, Al Ma' abir; 

 Coronatum Zone, Middle Callovian (?or Upper Callovian). 



Paracenoceras sp. indet. 



Description. One specimen, CN74. from the middle limestone 

 part of the Kilya Member, Wadi Kilya, 1 km NE of the Al Ma" abir 

 river crossing, is a slightly distorted half whorl from a phragmocone 

 of about 65 mm diameter. The whorls are highly depressed and have 

 a broad, arched venter. The whorl shape and suture-line are typical 

 of Paracenoceras. but the specimen is too poorly preserved for 

 specific identification. 



Occurrence. Middle part of the Kilya Member, Naifa Forma- 

 tion, Wadi Kilya; Beckeri Zone, Upper Kimmeridgian. 



