REPORT ON THE POLYZOA. 
99 
1. Tubucellaria, d’Orbigny. 
Sertularia (pars), Gmelin. 
Cellaria (pars), Solander, Lamx., Lamk., Blainv., Reuss, &c. 
Cellularia (pars), Pallas. 
Tubucellaria, d’Orb., Macgilliv. 
Tubicellaria, Heller, Risso, Costa. 
\ Onchopora (sp.), Busk. 
Character. — Zoarium composed of cylindrical, usually quadriserial internodes, articu- 
lated by flexible tubular peduncles, and arising either dichomotously from the extremity, 
or irregularly from the sides of the segment from which they spring. Zocecia pyriform, 
prolonged, and attenuated downwards, ventricose above and produced into a tubular 
peristome ; bordered by a very thin septal ridge. A simple circular median pore (often 
absent) in front immediately below the tubular peristome. Surface reticulato-scrobiculate, 
or simply and sparingly punctate. 
The genus Tubucellaria was instituted by M. d’Orbigny in 1851-2, for certain forms 
characterised pretty nearly as above, which had previously been included by himself and 
others under the vague names of Cellularia or Cellaria, and for some of which in 1855, 
not being aware of M. d’Orbigny ’s definition, I proposed the genus Onchopora, which, 
however, is now restricted to growths of a totally distinct kind. The only modification 
I have made in d’Orbigny ’s definition is to make it include more or less regular dicho- 
tomous groups ; and the existence, at any rate in one division of the genus, of a median 
frontal pore and a peculiar reticulato-scrobiculate sculpture of the surface. 
The genus thus defined would appear to include at least four known and well-marked 
forms, all of which are characterised by the peculiar sculpture of the surface above 
noticed, and usually by the presence of a simple circular median pore. 
These species are : — 
(1) Tubucellaria opuntioides, Pallas. 
(2) Tubucellaria cereoides, Ellis and Solander. 
(3) Tubucellaria hirsuta, Lamouroux. 
(4) Tubucellaria fusiformis, d’Orbigny. 
And to these it is probable that there may be added a fifth, in which the surface is simply 
and sparsely punctured and there is no trace of a median pore. To this form I would 
provisionally attach the name : 
(5) Tubucellaria cceca, Busk. 
Of these species, however, only two occur in the Challenger Collection. 
