PHALAI^GELLA. 
157 
Diagnosis. 
Idmoriiiclae Tvith. adnate or suberect, unilaniinar zoarium, the 
margin of TAbicb is lobed or entire. 
Zooecia with highly raised peristomes, ‘‘ disposed more or less 
ii’regularly in more or less regular divergent series.” 
Type Species. 
Tubipora flaheUaris, Fabricius, 1780 : Fauna Groenlandica, p. 430. 
PhalayiijeUa flabellaris^ Gri’ay : Fist Brit. Anim. in Brit. Mus. 
pt. i. 1848, p. 139. 
Bemaeks. 
The resuscitation of this genus of Gray’s is an unfortunate 
necessity, but a necessity it seems to be. The genus is here 
accepted for the group for which Busk, Hincks, and other neontolo- 
gists use the name Tuhiilipora. But that name is ineligible for the 
following reason. The genus Tuhiilipora was founded by Lamarck ^ 
in 1816 for seven species of Biyozoa. He did not select any one 
as a type. Accordingly, in 1821, Lamouroux, who accepted the 
genus, not unnaturally selected the species that came first in order 
in Lamarck’s series. He only referred to the one species, and thus 
settled T. transversa, Lam., as the type of Tuhulipora. But that 
species is now regarded as a young stage of ‘ Idmonea ’ serpens, of 
which it is a synonym. If Tuhiilipora is to be retained it must 
therefore be used for the group of species which includes ‘ Idmonea ’ 
serpens. This course has been adopted by several authorities on 
Bryozoa, as e.g. Busk ^ in 1875. Hincks,® on the contraiy, includes 
the species serpens in Idmonea, although he retains Tuhulipora, 
from which he thus excludes its type species. A third course has 
been suggested by Dr. Harmer, who remarks that “it is not clear 
that any generic difference between Tuhulipora and Idmonea can be 
maintained.” ^ There is certainly much to be said in support of 
that view. But Gray,® in 1848, proposed a course which is 
^ Lamarck : Hist. nat. Anim. sans Vert. vol. ii. p. 161. 
2 Busk: Cat. Mar. Polyz. pt. iii., Cycl. pp. 24-27. 
^ Hincks : Brit. Mar. Polyz. 1880, pp. 453, 443. 
^ S. F. Harmer. “On the Development of Tuhulipora'^ : Quart. Journ. 
Micros. Soc., new ser., vol. xli. 1898, p. 89. 
5 Gray: Cat. Rad. 1848, p. 139. 
