CORALS FROM THE UPPER GREENSAND. 59 
Tribe ASTREIN & (p. xxxi). 
Genus PARASTREA (p. xl). 
ParastREA stricta. ‘Tab. X, fig. 3, 3a. 
Corallum composite, forming a mass not very tall, and slightly convex on its upper 
surface. Cadices seldom circular, in general oblong or irregularly polygonal, projecting 
very little, and having always distinct margins. Coste delicate, closely set, nearly equal, 
almost horizontal, nearly straight or slightly bent, and united by their extremity to those of 
the neighbouring corallites, which, however, remain circumscribed by a small furrow. 
Calicular fossula shallow. Columella of a dense tissue, subpapillose, and not much developed. 
Septa thin, broad, closely set, terminated by a series of calicular dentations, the last of 
which (towards the columella) appears to be more developed than the others ; the number 
of these septa seldom exceeds forty, and they are rather unequal. Valls thin, but well 
developed. Diameter of the calices, usually between two lines and two lines and a half ; 
distance between the calices, at least half a lime. 
This species, found in the Greensand at Blackdown, is characterised from a specimen 
belonging to the Geological Society; it differs from all the previously described Parastrea 
by the approximation and delicate structure of the septa. 
Mr. Morris mentions, in his ‘ Catalogue of British Fossils,’ two other species which 
have been found by M. Austen in the Greensand at Haldon, and which belong to the family 
of Astreide. M. Austen considers the one as being identical with the Maestricht 
fossil coral described by Goldfuss under the name of Astrea elegans, and he refers 
the other to the Astrea escharoides® of the same author’. We regret not having had 
an opportunity of examining these fossils. 
VLoe. cit., p. di. 
2 Petref. Germ., vol. i, tab. xxiii, fig. 6. 
8 Goldfuss, op. cit., tab. xxii, fig. 2; fossil from Maestricht. 
4 Austen, on the Geol. of the South-east of Devonshire, Trans. of the Geol. Soc., Second Series, vol. vi, 
p- 402. 
