97 
M.Edw. 8, Genus Lithostrotion. L. basaltif orme, Conybeare. Of 
the four specimens the Museum possesses of this species, one (No. 179) is from 
Clifton, another (171) from near Tenby, and of the other two, (No. 172 and 
173), with 56 and 58 Septa, the locality is unknown. L. ensif er, M. Edw» 
All four specimens of this species (175 to 178) are from our rocks, and are 
very fine. L. aranea, McCoy, is represented by only one specimen, locality 
unknown, with 42, 44, 46, Septa. L. Portlocki, Brom. is by no means 
uncommon in our rocks, five of the nine specimens in the collection (184 to 
138) are from the Clifton Eocks, where it is sometimes found in huge 'blocks. 
The number of Septa I find to range between 26 and 32. L. Macoyanum, 
M.Edw. Of this Coral, Mr. W. Stoddart believes he possesses two specimens, 
from our own rocks, but it certainly has not been met with of late years, as 
I have in vain searched and enquired for it. L. concinorum, Lonsdale. L. 
septosum, McCoy. L. decipiens, McCoy. L junceum, Fleming., is repre- 
sented by three specimeas, locality unknown. L. Martini, M.Edw. Nine 
specimens of this Coral are in the collection (192 to 200), but only of two of 
them is the locality known, No. 199 is from Tockington, and No. 200, (with 
from 24 to 26 principal Septa) is from Bristol. L. irregulare, Phillips, is 
in one horizon of our rocks almost the only Coral found, or rather the rocks 
are entirely composed of it. Twenty- three, mostly very fine specimens, 
represent this species in our collection, and of these more than half the number 
are from our own rocks. The authors of the Monograph at page 190 say ' ' We 
are inclined to think that the Diphyphyllum gr&cileof Professor McCoy 
is a specimen of Lithostrontion irregulare, in which the Columella 
has been accidentally destroyed by the process of fossilization.'' This I 
consider a sentence altogether unworthy of the authors. Why should the 
Columella be more liable to such accidental destruction than any other part ; 
and might not anything and everything be explained in this way ? I cannot 
help thinking that McCoy's Diphyphyllum gracile is distinct from 
Lithostrotion irregulare, though I have not separated these two forms in 
our collection, wishing to follow entirely the authors of the Monograph. 
But Nos 208, 211, 212, 214, 215, 216, 217, and 218, are types of it, mostly 
from our own rocks, and a careful examination of them will show that all 
corallites in these specimens are without a Columella, which I think goes 
far to prove this a distinct form, 
L. affine, Fleming, is represented by two specimens, one from Bur rington, 
the other from a locality unknown. Of the rest of the species of this genus 
I should be very glad to obtain specimens for the collection, they not being 
