120 



A.B. SMITH ETAL. 



Occurrence. Upper Thanetian, G. pseudomenardii Zone, Casas 

 de Oraien, Navarra province, Spain. 



Material studied. BMNH EE45 14-21, EE6 196-6201, MGB 



37402, 37426-28. 



Genus CYCLASTER Cotteau, in Leymerie & Cotteau, 1856 



Diagnosis. Micrasterids with three gonopores (no gonopore 

 present on genital plate 2); commonly showing sexual dimorphism 

 in the size of gonopores. Petals short and weakly depressed only; 

 anterior ambulacrum with differentiated pore-pairs adapically. 

 Peristome weakly labiate and downward-facing. Subanal fascicle 

 present; peripetalous fasciole absent or present - when present it 

 may be partial or complete. 



Fig. 29 Camera lucida drawing of plating in Micmster (Pseudogibbaster) 

 tercensis Cotteau, 1 863, from the late Thanetian of Casas de Oraien 

 (Navarra): BMNH EE4521, apical surface. Scale bar = 5 mm. 



Cyclaster gindrei (Seunes, 1888) PI. 8, figs 1-5; Fig. 31b 



1888a Isopneustes gindrei Seunes: 795, pi. 28, fig. 2. 



Diagnosis. Test up to 35 mm in length. Subquadrate in outline, 

 with width 75-80% of length: widest where anterior petals reach the 

 ambitus and tapering shghtly posteriorly to a truncate posterior. 

 Anterior margin uniformly rounded, or with feeble anterior depres- 

 sion in largest individuals. Petals short and well-defined; anterior pair 

 diverging at 110-120°, posterior pair diverging at about 50° and 

 slightly curved. Anterior and posterior petals similar in length, with 1 6 

 pore-pairs in 5 mm long petals. The posterior interambulacrum is 

 raised as a keel aborally, and in profile forms the highest part of the test. 



Fig. 30 Camera lucida drawings of plating in Micraster (Pseudogibbaster) tercensis Cotteau, 1 863, from the late Thanetian of Casas de Oraien (Navarra); 

 a, BMNH EE6200, adoral interambulacrum 5, peristome at the top; b, BMNH EE4521, apical disc. Scale bars; a = 5 mm: b = I mm. 



PLATE 8 



Figs 1-5 Cyclaster gindrei (Seunes, 1 888), Danian of Erice, Navarra. 1-3. BMNH EE6206, apical, oral and lateral views, xl.5, 4, 5, BMNH EE6207, 



apical and oral views, x2. 

 Figs 6, 7 Cyclaster heberti (Nickles, 1 892), MGB 3755 1 , Maastrichtian of Santander, Cantabria. Apical and oral views. x2. 

 Figs 8-12 Micraster (Pseudogibbaster) tercensis Cotteau. 1863, Thanetian of Casas de Oraien, Navarra. 8, 9, 12, BMNH EE452I, apical, posterior and 



lateral views, xl. 10, BMNH EE6200, oral view, xl. 11, BMNH EE620 1 , apical view, xl. 



