DIASTOPOEA. 
133 
Zooecia rather long; well marked; with the apertures well 
spaced and mostly irregular in arrangement. 
Peristomes large. 
DlilEXSIOXS. 
Fide Pergens. 
Distance of apertures in same longitudinal series ... '5--6 min. 
Diameter of zooecia ... *25 ,, 
Diameter of apertures *08 ,, 
Disteibutiox. 
Foreigx : 
Senonian — Maastrichtian : Meudon ; Maastricht ; Petit -Lanaye^^ 
Sainte Colombe, Manche, in Craie a haculites. 
Campanian ; Eiigen. 
Goniacian: Joue, Indre-et-Loire, in Craie de Yilledieu. 
Cenomanian : Janieres and St, Calais, Sarthe. 
N’eocomian: Bettancourt-la-Ferree, Haute-Marne. 
Affixities. 
This species is characterized by its thick, strongly calcified 
zoarium, and it appears to have lived in comparatively shallow 
water. It differs from B. eschar aides ^ Mich., by its bilaminar 
zoarium and more crowded zooecia. 
LIST OF SPECIMEN'S. 
D. 1346. Two fragments (on slide), Maastrichter Kreide. Maastricht, Yine 
Coll. 
D. 3735, A fragment (on slide), Maastrichter Kreide. Petit-Lanaye. Gamble 
Coll. 
D. 6455. Five fragments (on slide). Maastrichter Kreide. Maastricht. 
Busk Coll. 
3. Diastopora auricularis (d’Orhigny), 1851. 
Syxoxymy. 
Bidiastopora auricularis, d’Orhigny, 1851. Bry. Cret. pi. 626, figs. 1-4. 
Mesenteripora ,, d’Orhigny, 1854. Bry. Cret. p. 810. 
,, ,, Pergens, 1890. Bevision, p. 369. 
Diagxosis. 
Zoarium of broad, fi’ondose, lobed expansions, which are some- 
what thick ; in places the fronds subdivide medially into two 
unilaminar expansions, which form a cylindrical tube. 
Zooecia slender, uniformly arranged, in regular linear series ; the 
apertures are often quincuncial in position. 
