214 Jao IE T omes—On Heterastrea, Lower Lias. 
still have, and they have been referred to on the present occasion. 
They are without doubt referable to the same genus as the other 
species herein mentioned. 
HEreRASTR#A ENDOTHECATA, Dunc. sp. Pl. VII. Fig. 9. 
Tsastrea endothecata, Duncan, Supp. Brit. Fos. Cor. pt. iv. p. 53, pl. xii. figs. 17-21. 
Of this species the original describer says “the marginal 
gemmation is frequent.” The figured specimen is now before me, 
and I observe a considerable number of calices which are elongated 
and have more than one fossula, as well as marginal gemmation, 
which is common. The irregularity in the size and form of the 
calices is due to the operation of these two processes proceeding at 
the same time. Besides the type-specimen, I have some others 
taken from the Ammonites angulatus beds of the Lower Lias, about 
a mile west of Evesham. These examples have a very distinct line 
where the corallites come together, indicating imperfect union. 
Hererastr@a Harmer, Wright sp. 
Septastrea Haimet, Duncan, Supp. Brit. Fos. Cor. pt. iv. p. 5, pl. i. figs. 1-5. 
In 1860, when my late friend Dr. Wright was engaged in 
investigating the Ammonite zones of the Lower -Lias, he obtained 
an Isastrea from the Ammonites planorbis beds of Street, and it was 
mentioned under the name of Isastrea Murchisoni, at pages 390 and 
397 of the paper which followed his investigations. 'The specimen 
was for some time in my hands, and was afterwards described and 
figured by Prof. Duncan under the name of Isastrea latimean- 
droidea. At this time an Isastr@a, said to have been obtained from 
Evesham, also formed part of Dr. Wright’s Collection, but no 
mention was then made of it by him, though afterwards, in one of 
the volumes of the Palezeontographical Society, it was mentioned as 
Isastrea Haimei, and as I then believed, and still believe, was 
erroneously stated to have been also obtained from the Ammonites 
planorbis beds of Street. Instead, however, of its appertaining to 
that Ammonite zone, J entertain no doubt whatever that it is 
referable to the Ammonites angulatus beds of the neighbourhood of 
Evesham. 
Prof. Duncan subsequently described and figured it as Isastrea 
Haimei. As I have not recently had the opportunity of examining 
the type-specimen, I cannot speak decisively of its generic relation- 
ship, though I do not doubt that it is a species of Heterastrea. 
Herrrastr#A Tomust, Duncan sp. Pl. VII. Figs. 5, 6. 
Isastrea Tomesi, Duncan, Supp. Brit. Fos. Cor. pt. iv. p. 46, pl. xv. fig. 20. 
The type of this species is so indifferently preserved that were it 
not a well-marked species it would be practically useless for com- 
parison. But the very thin walls and septa which are apparent, 
whatever may be the condition of the specimen, will at once dis- 
tinguish it. As a species it is not by any means uncommon; and I 
have seen specimens trom several localities in the neighbourhood of 
Evesham, in addition to Grafton, where the type was obtained. It 
