372 
BULLETIN 10G, UNITED STATES NATIONAL MUSEUM. 
Gemellipora polita MacGillivray, 1904. 
Gemellipora aurieulata Maplestone, 1901. 
Under the name of Gemellipora , Smitt has described two sorts of apertures. 
The first species described belongs to the genus Pasythea Lamouroux, 1812. The 
orifice of Gemellipora glabra is the one which has been considered as typical. In 
1904, Waters gave a list of species of this genus; but it will be necessary to redis- 
tribute them into the genera Schizomavella and Trypostega. 
GEMELLIPORELLA, new genus. 
The ovicell is hyperstomial and deeply embedded in the distal zooecium. The 
operculum does not close the ovicell and operates in a locella. The form of the 
aperture is like a keyhole. The frontal’ is garnished with lateral areolar pores 
and with a granular pleurocyst. 
Genotype. — Gemelliporella vorax , new species. Range : Miocene, Pliocene, 
The genus Gemellipora Smitt, 1872, comprised species with both a tremocyst 
and a pleurocyst; we group the latter in this new genus. The type species will be 
described in a forthcoming volume. 
Genus NIMBA Jullien, 1903. 
1903. Nimba Jullien, Bryozoaires provenant des campagnes de VHirondelle, Monaco, p. 93. 
The frontal is smooth or granular. The orifice is semilunar, with a rimule 
on the poster which is almost entirely formed of two large cardelles, ‘which the 
rimule separates; the anter is smooth; the peristome forms a sort of aureola around 
the orifice, and the globular ovicell occupies the anterior region of the aureola. The 
opening of the ovicell is always closed bj^ the operculum, which must lower itself 
to give passage to the larvae. (Translation after Jullien.) 
Genotype. — Nimba praetexta Jullien, 1903. Recent (Azores). 
Genus CHARACODOMA Maplestone, 1900. 
1900. Characodorna Maplestone, Further descriptions of the Tertiary Polyzoa of Victoria, 
pt. 4, Proceedings Royal Society of Victoria, vol. 13 (n. s.), pt. 1, p. 7, pi. 2, fig. 17. 
“ Zoarium in elongated quadrate internodes. Zooecia uniserial on each face 
of the zoarium. Apertura ovate with a sharp denticle on each side pointing down- 
ward over the lower or distal triangular portion.” (Maplestone.) 
Genotype. — Gliaracocloma halli Maplestone. 1900. Miocene of Australia. 
Group 2. HIPPOPORAE Canu and Bassler, 1917. 
(LEPRALIIDAE Jullien, 1903.) 
Anatomical bibliography. — 1865. Smitt, Om Hafs-Bryozoernas utvekling och fett kroppar Ofver- 
sight, Kongl. Vetenskaps-Akademiens Forhandlingar, vol. 22, pp. 7, 28, pi. 1, figs. 11, 12 ; pi. 2, 
fig. 1, pi. 5, figs. 20-22. — 1877. Barrios, Recherches sur l’embryologie des Bryozoaires, Travaux 
de l’lnstitut de Zoologie de Lille, fasc. 1, pi. 7, figs. 9, 13, 17, and 20. — 1900. Calvet, Contribu- 
tion a l’histoire naturelle des Bryozoaires ectoproctes marins, Montpellier, pi. 6. — 1903. IIarmer, 
