‘270 
PERIPOHA. 
Coiiiacian : South of Les Roches, Villedieu, and Vendome, 
Loir-et-Cher, in Craie de Villedieu ; Toui-s, Indre-et- 
I.oire. 
Cenomanian : I^e Mans and St. Calais, Sarthe ; Lower (^uader, 
Saxony. 
Affinities. 
The main question in regard to this si)ecies is the relationship of 
the two specimens figured by d’Orl)igny as Peripora /ifjeriensis. 
The first specimen was figured in 1851, and upon it the genus 
had been founded in 1850. That specimen came from the 
Cenomanian, and is clearly a thin branch of P. psendospi rails, 
having spiral apertures in a double series. In 1853 d’Orhigny 
figured a Senonian specimen with the a])ei*tures verticillat(', 
arranged very irregularly and not (|uincuncially, and with the 
zones separated by wide interiiodes. The ])eristomes were shown 
to be much higher than in P. pseudospiral is ; l)ut that character, 
according to M. Pergens, was exaggerated by d’Orhigny, wlien'as 
M. Canu tells us that the figure “ n’est pas si ideale que le dit 
Pergens.” The other features, at any rate, may justify distinction. 
The Museum collection includes a Senonian specimen, which is 
a typical P. pseiidospiralis, so that the liperiensis and pseudospiralis 
forms are not characteristic of distinct hoiizons. 
D’Orbigny also included in his P. ligeriensis the very distinct 
Escharites distans, Hag. 
The Escharites distans, Hag., seems to me to eover two species, 
a Maastrichtian variety of Peripora pseudospiralis with long 
interzones, and an Eleid species of very diflPerent characters. 
That the length of the interzones is not a constant feature* in the 
Maastrichtian variety is shown by a specimen (D. 3748) in the 
Museum collection, in which the internodes are no longer than 
in the Cenomanian specimens. A species is recorded by Pergens 
and Meunier from Eaxoe as Escharites dutans ; but as they describe 
the internodes as sometimes suppressed, it may be the Eleid species. 
LIST OF SPECIMENS. 
D. 3748. A branched fragment (on slide). Maastricliter Kreide. - Petit 
Lanaye. Gamble Coll. 
D. 4834. A specimen with regular quincuucial apertures and narrow interzonal 
areas (on slide). Senonian: Coniacian. South of Les Roches. 
Purchased 1898. 
