of South Devon and South Cornwall. 469 
three) of oblong orifices, with raised margin, the nature of which 
I have had no opportunity of determining. 
I was at one time inclined to regard the first of the varieties 
of Tubulipora hispida described by Johnston (p. 269) as identical 
with the Discoporella flosculus ; but I am now convinced that he 
had in view the early state of Heteroporella hispida, which is at 
first a simple subconical disk, somewhat “ dimpled” at the centre, 
with radiating rows of cells, which are but little elevated, and 
are “ closely compacted near the circumference.” The large adult 
specimens seem to be formed by successive buddings from the 
margin, the cluster of disks thus produced gradually coalescing 
so as to constitute a composite structure, with many papillary 
prominences studding the surface. 
In D. flosculus the polyzoary is always simple, circular in 
shape, and of small size. 
[Coast of Labrador, on weed.]} 
4, Heteropore.ta, Busk. 
H. hispida, Fleming. 
Discopora hispida, Fleming, Brit. Anim. 530. 
Tubulipora hispida, Johnston, Brit. Zooph. 268, pl. 47. figs. 9, 10, 11. 
Discopora hispida, Couch, Cornish Fauna, 109, pl. 19. fig. 1. 
?Heteroporella radiata, Busk, Crag Polyzoa, 127, pl. 19. fig. 2. 
Very abundant on stones, shells, &c., from moderate depths 
to deep water (60 fathoms). 
The Discopora hispida of Fleming, a very common British 
species, must be assigned to the Heteroporella of Busk, a genus 
lately constituted for the reception of two Crag forms, which 
agree with the Heteropora of De Blainville in having “ openings 
of two distinct kinds” on the surface, but differ from it in being 
adnate and incrusting, instead of erect. One of these fossil 
species, the H. radiata, appears to be identical with the present 
_form. The mouths of its cell-tubes, indeed, are described as 
“simple and even with the surface,’ whereas in H. hispida they 
are raised and spinous in the perfect state. But even in recent 
specimens the erect portions are often wanting, and the surface 
is uniformly porous. 
Dr. Johnston has described two varieties of his Tubulipora his- 
pida, which are only, I believe, the young and adult states of the 
Discopora hispida of Fleming. His figures (pl. 47. figs. 9, 10, 
11) are indifferent representations of this form. 
The Discopora hispida of Couch’s ‘Cornish Fauna’ is also 
Fleming’s species. 
I am indebted to Mr. Holdsworth for drawing my attention 
to the fact that it belongs to the genus Heteroporella. 
H., hispida often attains a very considerable size. A specimen 
Ann. & May. N. Hist. Ser. 3. Vol. ix. 33 
