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BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Ihe whole frontal wall of the zooecia is a cryptocyst and they have a well 
ehitinized, bilaminar, simple operculum with a straight or concave proximal margin. 
Within the proximal and sometimes also within the distal margin of the aperture 
is placed a pair of (or sometimes a single broad) supporting teeth. The subo- 
percular area of the avicularia has an unusually strongly developed, sometimes 
almost complete cryptocyst. The ovicells are endotoichal. (After Levinsen, 1909.) 
The genera known are Gellaria Authors, Gianotremella Canu, 1911, Melicerita 
Milne-Edwards, 1838, Euginoma Jullien, 18S2, and Eri.na Canu, 1908. 
C x50 
Fig. 76. — Genus Gellaria Lamouroux, 1812. 
A-D. Gellaria sinuosa Hassall, 3841. A. Zoarium, natural size. B. Usual form of zooecia, 
X 50. C. Zooecia, X 50, with an avicularium. D. Two zooecia, X 50, with ovicells. (A-D 
after Hindis, 1880.) 
There are certainly generic divisions still to be made in the very important 
genus Gellaria when we better understand the function of the oral armature and 
the working of the hydrostatic system. 
Genus CELLARIA Authors . 1 
The zoarium is articulated, with cylindrical segments (internodes). The 
ovicell is endotoichal and is closed by a peculiar, chitinous operculum moved by 
especial muscles. The operculum is formed of a ehitinized inner part, closing the 
aperture, covered by the exterior ectocyst. 13-15 tentacles. 
Genotype.— Gellaria fstulosa Linnaeus, 1768. 
1 The genus Gellaria was named by Lamouroux in 1812, but we cite it as “ Authors ” to show that we 
agree with the great majority of the authors of the nineteenth century in regard to this genus. Recently 
Norman (1903) and Levinsen (1909) have found good cause for bibliographic reasons, to change Cellular ia 
to Gellaria and Gellaria to Gellularia. We are absolutely indifferent to these disputes for they do not 
increase our technical knowledge. The word Cellaria is a century old, and as it has always had a distinct 
meaning, why should we change it? 
