or 
~ 
CORALS FROM THE UPPER GREENSAND. 
CHAPTER V. 
CORALS FROM THE UPPER GREENSAND. 
Tur class of Polypi had not, im all probability, numerous representatives in the seas 
where the Upper Green Sand was deposited, for we have as yet seen only four British 
species belonging to that formation, and the English geologists do not appear to have met 
with many more. Most of these fossils belong to the family of Astreidze, and have been 
found at Haldon, at Blackdown, or at Warminster. One of these British species 
appears to be identical with a coral described by Goldfuss, and found in the chalk forma- 
tion of Essen; and Mr. Morris has pointed out two others as being referable to species 
found in the chalk of Maestricht, but we have not had an opportunity of recognising the 
specific identity of these last-mentioned fossils. 
Family ASTREID Ai (p. xxi). 
Tribe EUSMILIN & (p. xxiii). 
1. Genus PerLosMiLiA (p. xxv). 
PepLtosmintia AusTeNI. ‘Tab. X, fig. 1, la, 14. 
Corallum simple, fixed by a broad basis, cylindrical, and surrounded from top to 
bottom by a membraniform epitheca, presenting some slight transverse folds. Calice 
circular, or somewhat oval; fossula shallow, narrow, and elongated. Co/umella well 
developed and lamellar. Septa appearing to form four well-developed cycla, and a fourth 
rudimentary one. ‘The primary and secondary ones equal, and differing but little from 
the tertiary ones; they are all thick, broad, closely set, slightly exsert, not quite straight, 
those on one side inclining to the right near the columella, and those of the other side 
bending in an opposite direction. A vertical section of this Coral (fig. 14) shows that 
the septa are granulated on their lateral surfaces, especially near their inner edge, which 
joins the columella, and that these granulations form closely-set radiate rows. Déssepi- 
ments vesicular, and rather abundant. Height of the coral, one inch and a half; diameter 
of the calice, above an inch. 
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