364 Prof. Allman on the Construction and 
vested by a chitinous periderm. Polypites developed from the 
summits of the branches, “ vase-shaped, destitute of proboscis ” 
(metastome), and having the tentacles in a single verticil round 
the margin of the distal end of the vase-shaped body. “ Coral- 
lum (periderm) body, mouth, and lower half of each of the tenta- 
cles clothed in an opake brown membrane.” (Dr. T. 8S. Wright.) 
Gonosome.—Gonophores adelocodonic, developed from the 
coenosare. 
Some years ago (Ann. Nat. Hist. July 1859) I constituted a genus, 
under the name of Manicella, for a singular Hydroid which I had 
discovered in the Firth of Forth. Simultaneously with the publica- 
tion of Manicella, Dr. Strethill Wright published his genus Bimeria 
for a Hydroid which he had previously described and characterized 
as a new genus under this name at a meeting of the Royal Physical 
Society of Edinburgh, but of which no published account existed. 
On seeing Dr. Wright’s description of his Bimeria, I was at first 
disposed to regard the two genera as identical, and to believe that we 
had been, independently and unknown to one another, describing the 
same form. Further consideration, however, of Dr. Wright’s deserip- 
tion of Bimeria has shown me that, besides differing in some minor 
points, this description is in one very important point quite inappli- 
cable to Manicella ; for while Manicella possesses a well-developed 
metastome, it is stated by Dr. Wright that there is no metastome in 
Bimeria. 
I have had no opportunity of inspecting authentic specimens of 
Dr.Wright’s Hydroid. It is quite possible that the metastome of 
Bimeria may have been overlooked; this question can be decided 
only by further examination. Until, however, the absence of a 
metastome in Bimeria be confirmed, I should hesitate to give Mant- 
cella the position of an established genus; and I shall therefore for 
the present retain it as entirely provisional. — 
Bimeria vestita, Wright. 
4, Garvet, Strethill Wright. 
Trophosome.—Ccenosare invested by a periderm, and con- 
sisting of a branching hydrocaulus, which is rooted by a filiform 
hydrorhiza, and towards its base composed of aggregated tubes. 
* Polypites fusiform, developed on the summits of the branches, 
and having the tentacles in a single verticil round the base of a 
long conical metastome. 
Gonosome.—Gonophores adelocodonic, borne on the summits 
of short branches, which spring from the sides of the hydro- 
caulus. 
Garveia nutans, Wright, = Eudendrium (Corythamnium) bacei- 
ferum, Allm. 
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