CELLULARINE AND OTHER POLYZOA. 311 
appears " Gemdlaria loriculata, Savigny," a combination "which was used 
neither by Savigny nor by Audouiu ; and Q. bursaria (Sertularia bursaria, L., 
1758, p. 814). These two species are respectively the genotypes of 
Eucratea, Lamx. 1812, and Epistomia, I'leming, 1828. Gemicellaria, ■which 
was an alteration of the genus proposed by Savigny, " sous le nom de 
Gemellaria " (really " Gemellaires "), thus becomes synonymous with two 
genera of earlier introduction. 
Halophila, Gray, 1843, p. 292. — Genotype (the only species), Halophila johnstonce, 
Gray, n. sp. (thus written, although frequently modified later, even by Gray 
himself, to johnstonice). If this species is referred to Bugiila, as I think is 
proper, Halophila becomes a synonym of that genus. 
Heterocella, Canu, 1907, Ann. Paleont. ii. p. 70 (sep. p. 14). — Genotype, selected by 
the author, Heterocella fragilis (Vincularia frac/ilis, Defrance, 1829, Diet. Soi. 
Nat. Iviii. p. 214). See also de Blainville, 1834, p. 454. 
Heteroflustra, Levinsen, 1909, pp. 124, 125. — A very unsatisfactory genus, proposed 
for those species of Flustra, auctt., which have not been placed in other genera, 
and " must provisionally be characterized mainly in a negative way." This 
appears to mean that all species not belonging to Flustra (s. sir.), Sarsijlustra, 
Kenella, Betiflustra, and Spiralaria (genera recognized by Levinsen, p. 88), 
together with other genera such as Carbasea, Chartella, etc. (not considered 
by him), are to be placed in this provisional genus, which has no validity 
until it is more definitely characterized. 
Hiantopora, MacGillivray, 1887, Tr. Proc. K, Soc. Vict, xxiii. p. 208. — Genotype 
(the onlj- species), Hiantojyora ferox (^Lepralia ferox, MacGillivray, 1869, 
Ibid. is. p. 132). 
ffimanto'zoum *, n. gen. — Genotype, Himantozoum mirabilc (Biu/ula mirabilis, Busk, 
1881, Q. J. M. S. xxi. p. 12 ; 1884, p. 39). 
I propose this genus for Sect, a of Bugula, as given by Busk, 1884, p. 37, 
with the following diagnosis :• — 
Zoarium stalked, the stalk composed of rootlets and prolonged into an 
attaching tuft of rootlets. Zocecia biserial to multiserial, the biserial branches 
composed of as3'mmetrical zooeeia, between which are intercalated, in the 
pluriserial branches, one or more rows of median zooeeia, which are sym- 
metrical and some of which produce eggs. The ovioells are vestigial, and the 
■egg, which is of large size, develops iu the body-cavity of the fertile zooecium. 
Opesia occupying all or most of the front, an operculum being distinguishable, 
^ooscia overlapping their predecessors oa the basal surface, their proximal 
ends strongly forked. Avicularia unstalked, attached to the proximal ends of 
the zooeeia, those of the lateral and median rows more or less unlike. 
The differentiation of median, symmetrical, fertile zooeeia, as well as the 
characters of the avicularia, are striking features of this genus. In addition 
to the genotype, the following species may be included : — Bugula leontodon, 
liusk (1884, p. 39), B. sinuosa, Busk (1884, p. 39), B. margaritifera, Busk 
* 'ifxas, a strap, in allusion to the strap-shaped branches. 
23* 
