28 Rev. T. Hincks’s Catalogue of Zoophytes 
the Deadman; from 40 fathoms, ten or twelve miles south of 
Polperro, &e. 
The specimens from these deep-water habitats exhibit very 
fully the distinctive characters of the species. 
5. M. Pouilletii, Audouin. 
Abundant ; frequently overspreading the interior of deserted 
shells, &c. 
6. M. imbellis, Hincks. 
Occasionally from deep water: off the Deadman, from 60 fa- 
thoms; on shell from the Brixham trawl-boats. 
Weighty as Mr. Busk’s judgment on such a point undoubtedly 
is, I find myself unable to agree with him in regarding M. im- 
bellis as ‘(an unarmed variety of M. Flemingit.” Its cells are 
much larger than those of the latter species, and more widely 
separated ; and the numerous specimens which I have examined . 
from very various localities have been uniformly destitute of the 
calcareous expansion, as well as of the spines and avicularia, 
which distinguish M. Flemingit. 
7. M. Lacroiait, Savigny. 
Encrusting stones and shells between tide-marks, not un- 
common ; also dredged in moderate depths. 
In sheltered situations, the cells are completely set round with 
delicate spines, which bend mwards. Johnston’s plate 57. 
fig. 11 represents this condition. 
8. M. hexagona, Busk, ‘ Microscopical Journal’ for 1856, 
page 308. pl. 12. fig. 4. 
“Coast of Devon (Miss Cutler) ; Fowey Harbour (Peach).” 
9. M. monostachys, Busk. 
Spreading over the surface of a stone, between tide-marks, 
Torquay. 
The Torquay specimen, which I refer to this species, differs 
in some respects from Mr. Busk’s description. The cells are 
arranged in linear series, of varying width, and are prolonged 
and attenuated downwards; the aperture is oval, and the margin 
armed with numerous spines; about seven or eight are ranged on 
each side, the uppermost pair being larger than the rest and 
standing erect; below the aperture, there is a prominent acumi- 
nate spine, slightly curved. In the M. monostachys as described 
by Busk, the latter only is present,—the margin being other- 
wise unarmed. The shape of the cell is the same in the two 
forms; and the presence or absence of the delicate marginal 
