ELEA. 
301 
Zooecia naiTow. 
Apertures elliptical or semicircular ; arranged in more or les& 
regular transverse rows. The apertures are often closed by 
an epithecal membrane. 
Gonocysts ovoid ; about thrice the length of the exposed parts, 
of the zooecia ; rarely developed. 
Diaiexsioxs. 
B.^[. R.M., D. 4685. Tide Pergens. 
D. 4679. Yar. dicliotoma. Type form. Yar. dicliotoma. 
Diameter of branch ... 3 x 4 mm. 1*5 x 3 mm. 
Diameter of zooecia ... •25-’3 ,, •25-*35 ,, *26-*3 mm. *26-*3 mm. 
Diameter of aperture ; 
transverse ‘ll-’H ,, -14--16 ,, -11--12 ,, *18 ,, 
Distkibijtiox. 
Senonian — ? Santouiau : Saintes. 
Coniacian; Tours and Luynes, ludre-et- Loire ; Yilledieu, 
Loir-et-Cher. 
Turonian : Chinon, in Calcaire jaime ; Yillavard, Lavardin, Troot, 
Sougc, Moutoire, and Yillardin, Loir - et - Cher, in 
Craie marueuse ; Tourtenay, Deux - Sevres ; Sainte- 
]\[aure, Indre-et- Loire ; Angouleme, Charente. 
? Cenomanian : St. Calais and Janieres, Sarthe {fde Canu). 
Figuee. 
Fig. 33. A gonocyst and adjacent zooecia, x 9 dia. Turonian — 
Calcaire jaune : Chinon. D. 4674. 
Fig. 33 . — Elea vieilhancl (Orb.). 
Affinities. 
D’Orbigny separated some of the specimens from the Coniacian 
as S. dichotoma, which has been accepted by Pergens on the 
ground of the larger size of the apertures in that form. The 
variation in this character, however, is considerable, and the two 
