122 =Mr. F. M‘Coy on some new genera and species of — 
to the centre, and stating that there are no transverse plates ; I 
was rather surprised therefore to find the characters I have given 
above, in authentic specimens from the Eifel of the C. sulcata 
(Gold.) ; they also exist in the C. zrregularis (Minst.), C. senilis 
(Koninck), and the following. I denythe existence in those species 
of radiating lamelle near the centre, and find the transverse dia- 
phragms conspicuous. The real affinities of the genus seem to 
be between Michelinea and Amplexus, differing from the former 
in the tubes being individually distinct (as in Stylastrea) and 
easily separable by fracture, and being without communicating 
pores ; from the latter it only differs in its compound mode of 
growth. As thus restricted the genus is no doubt a good one: 
the other dissimilar species placed in this genus by Dr. Goldfuss 
and others will easily fall into Cyathophyllum and other existing 
genera. 
Columnaria laxa (M‘Coy). 
_ Sp. Char. Corallum forming large masses of contiguous, slightly 
flexuous tubes, rarely in contact ; generally round and finely 
wrinkled transversely, occasionally the tubes in some part of 
their length touch the adjoining ones, and then become poly- 
gonal and longitudinally sulcated ; transverse diaphragms un- 
dulated, and obliquely inclined in various directions ; diameter 
of tubes from 3 to 4 lines. 
The tubes being rarely in contact, and often cylindrical and 
flexuous, distinguishes this species from its congeners. The — 
transverse diaphragms and absence of radiating lamelle will 
serve to separate prismatic portions from the other basaltiform 
corals found with it. 
Not uncommon in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge.) ; 
Michelinea glomerata (M‘Coy). 
Sp. Char. Cells polygonal, irregularly aggregated, so as to open 
on every side of the large amorphous masses formed by its ir- 
regular mode of:growth ; cells averaging 2 lines in diameter ; 
internal vesicular plates very irregular, much curved and highly 
inclined. 
This is perhaps most allied to the Russian M. concinna(Lonsd.), 
but as that species is remarkable for the breadth, flatness and 
horizontality of its internal plates, so this is equally remarkable 
for their irregularity, convexity, small size, and nearly vertical 
position, forming in the sections a multitude of small rounded 
vesicles, without any approach to horizontality. The small size 
of the cells and mode of growth seem somewhat analogous in 
2, 
