272 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



The whole frontal wall of the zooecia is a cryptocyst and they have a well 

 chitinized, bilaminar. simple operctilum 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 Cellaria Authors, Cianotremella Canu, 1911, Melicerita 

 Milne-Edwards, 1838. Knffinoma Jullien. 1882, and Erina Canu, 1908. 



D "50 



C '50 



FIG. 70. Genus Cellaria Lamouroux, 1812. 



A-D. Cellaria sinuosa Hassall, ]841. A. Zoarinm, natural size. B. Usual form of zooecia, 

 X 50. C. Zooecia, X 50, with an aviculariuiu. D. Two zooecia, X 50. with ovicells. (A-D 

 after Hincks, 1880.) 



There are certainly generic divisions still to be made in the very important 

 genus Cellaria 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 (internod.es) . The 

 ovicell is endotoichal and is closed by a peculiar, chitinous operculum moved by 

 especial muscles. The operculum is formed of a chitinized inner part, closing the 

 aperture, covered by the exterior ectocyst. 13-15 tentacles. 



Genotype. Cellaria fistulosa Linnaeus, 1768. 



1 The genus Cellaria 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 Levinseu (1909) have found good cause for bibliographic reasons, to change Cellular in 

 to Cellaria, and Cellaria to CeUularia. We are absolutely indifferent to these disputes for they do not 

 iniTciis.- mil- irrlmiriil k HUH In 1 i;i\ Tin* wui'il f'rllnria is a century old. and as it has always had a distinct 

 meaning, why should we change it? 



