170 
THE VOYAGE OF H.M.S. CHALLENGER. 
(1) Myriozoum honolulense, n. sp. (PL XXV. fig. 2). 
Character. — Zoarium about 0 //- 7 5 high, simply branched in all directions, rising 
from an encrusting base. Zooecia rhomboidal, flab, with faint wavy septal ridges. 
Orifice orbicular, sinuated, perfectly even with the surface, lower lip slightly raised or 
tuberculated. Surface punctured. Small circular, scattered, immersed avicularia. 
Habitat . — Off Honoruru, Sandwich Islands, 20 to 40 fathoms. 
From the single small specimen this would seem to be a dimorphic form, that is to 
say, the base sometimes expands into a single hemescharine layer. 
(2) Myriozoum immersum, n. sp. (PI. XXV. fig. 4). 
Character . — Zoarium with divergent, furcate ramifications, branches about 0"T25 in 
diameter. Zocecia completely immersed, so that their outline is quite obscured ; surface 
finely wrinkled longitudinally ; orifice (primary) very deeply immersed at the bottom of 
a deep pit, on the sides of which are usually one or more very minute immersed 
avicularia with a pointed triangular mandible ; the primary orifice itself is probably of 
an inverted horse-shoe shape. A very few scattered papillary eminences formed by the 
projection of the upper border of the oral pit in a cucullate form, each of which has 
a small avicularium on the under side (fig. 4a). 
Habitat. — Station 320, lat. 37° 17' S., long. 53° 52' W., 600 fathoms, green sand. 
In this case it is very difficult to make out the true form of the primary orifice, owing 
to the depth at which it is placed, even in the youngest zooecia. In general, however, 
the secondary ? orifice has the form above mentioned, with one or more irregular internal 
projections. In the zooecia which project in the form of conical papillae the primary 
mouth would seem to be Myriozoan in character ; the sinuation of the lower border is, 
however, very slight. The systematic position of the species is very doubtful. 
(3) Myriozoum simplex, n. sp. (PL XXV. fig. 1). 
Character. — Zoarium composed of slender cylindrical, dichotomous branches. Zooecia 
at the growing extremities subventricose, distinct, in the older parts completely 
immersed and indistinct. Peristome in the younger cells raised, tubular, canaliculate or 
deeply emarginate in front ; in the older cells forming merely a rounded eminence, with 
an apparently circular emarginate orifice. Surface rough, sparsely punctured ; in the older 
portions smooth and shining. Ooecia 1 deeply immersed. Avicularia 0. 
Habitat . — Station 320, lat. 37° 17' S., long 53° 52' W., 600 fathoms, green sand. 
