378 
PETALOPORA. 
Fetaloporci tenera, von E,enss, 1872-3. Bry. unt. Quad. : Palioontogr. vol. xx. 
pt. 1, p. 133, pi. xxxiii. tig. o. 
? Eficharites seriata, Bomer, 1840. Verst, uordd. Kr. p. 17, pi. v. fig. 11. 
? Vaginopiora ,, von Hagenow, 1846. In Geiuitz, Grundr. Verst, vol. ii. 
p. 602. 
? Ocriopora striata, Giebel, 1848. Plimerm. Quedl. : Zeit. Zool. Zoot. etc.. 
vol. i. p. 17. 
h ,, spinosa, Giebel, 1848. Ibid. p. 17. 
Diagnosis. 
Zoarium of long cylindrical brandies, which divide dichotonioiisly 
and may thicken distally. 
Zooecia from ten to fifteen in a circuit round the stem. The 
apertures are irregularly distributed, and not zonal. 
The maculae are irregular in size and number: the average 
number is about five pairs to each zooccium. In old basal 
parts of the zoarium the pits become much smaller and 
closed ; but may be more numerous and not restricted to 
a double row on each zooocium (stage pohjpora). 
The longitudinal vertical ridges are straight or somewhat flexuous 
flexuosa). In basal parts of the zooecia they are obscure. 
Dimensions. 
Diameter of braucli 
Diameter of zooecia 
Diameter of aperture 
B.M., D. 713. 
1 mm. 
•25 „ 
•08 „ 
Distribution. 
British. 
Upper Chalk ; Dover ; Charlton ; Sussex ; near Lewes. 
Middle Chalk : Chatham. 
Foreign : 
Senonian — Maastrichtiau : Maastricht ; Fecamp, Seine- Inf erieure. 
Campanian: Biigen. 
Sautonian : Saiutes, Chareute-Iuferieure ; Cachembach 
and L’ Arche de Leves, near Chartres. 
Coniacian : Luynes, Saiute-Paterue, La Eibochere, and 
near Tours, Indre-et-Loire ; Lavardin, Loir-et-Cher. 
Turonian or Coniacian : Lisle, Vendome, Villavard, Les Boches, etc., 
Loir-et-Cher. 
Turonian : St. Bimay, Villardiu, and Augouleme, Chareute ; Martigues, 
Bouches-du-Bhone ; Chorouschek, Vtelno, and Gross- 
Ujezd, Bohemia, in Iser Schichten. 
Cenomanian : Plaueu, Saxony, in Lower Quader ; Kolin, Bank, and 
line, Bohemia, in Korycaner Schichten ; Essen, in 
Essener Griinsand. 
