REPOET ON THE POLYZOA. 
83 
ingly delicate, with a very slender median and two lateral ridges, and a row of very 
distant pores on each side and a few of smaller size on the sides and below the orifice. 
Ooecium galeriform, completely immersed in front of the superjacent zooecium, and 
covered with the general epithecal membrane, with which the entire growth is enveloped 
as in a loose veil. 
Calymmophora lucida, n. sp. (PI. XXXII. fig. 3). 
Character . — The only species. 
Habitat. — Station 163a, off Twofold Bay, 150 fathoms, green mud. 
One great peculiarity in this form is that the external chitinous membrane, or 
epitheca as it may be termed, which is in fact the remains of the original germinal 
membrane of which the incipient budding zooecia are solely formed, is completely 
detached, except at a few points, from the proper calcified wall, and forms a universal 
beautifully transparent veil over the entire growth, passing as it were uninterruptedly 
from one zooecium to another, and enclosing the ooecia. Another special characteristic 
is the completely terminal position of the mouth, the oral valve constituting a curved lid, 
which when open is thrown forwards. 
The growth is everywhere as transparent as glass, so that the whole internal economy 
is visible. The polypide is of comparatively small size compared with the capacity of 
its habitation, and presents nothing unusual, except that there is no ventricular diverti- 
culum, nor any distinct oesophagus nor pharynx. The retractor muscles do not appear 
to be either striated or nucleated, and there is no appearance of a so-called funiculus, 
nor in fact of any structures within the cavity beyond the retractor muscular fibres. 
The extreme delicacy and transparency of the textures make it advantageous to 
employ some colouring agent in the examination. 
Family XIV. Salicorn ariad^e. 
Salicornariadce (pars), Bk., Brit. Mus. Cat. 
Salicornariidce (pars), Bk., Crag Polyz. 
Salicornaridea (pars), Reuss. 
CellariecB (pars), Srnitt. 
Cellaridce, Escharellinidce, &c., d’Orb. 
Cellariidai, Hincks, &c. 
Character . — Zoarium erect, radicate or fixed ; simple, branched, or lobed ; seg- 
mented or continuous ; cylindrical, with the cells disposed round an imaginary axis, 
or compressed and bilaminar. Surface areolated. Zooecia completely immersed, each 
corresponding to an a.rea ; front depressed, usually concave. Orifice crescentic, semi- 
