EEPOET ON THE HOLOTHHEIOIDEA. 
151 
central hole, or with only one end perforated. Mouth stellate, closed Ijy five 
groups of eight to ten papillai in each. Calcareous ring of ten simple, flexible, 
spongy pieces, each bifurcated posteriorly ; the pieces are not united with each 
other. 
Habitat. — Sydney (Selenka), Port Denison and Port Stephens (Bell). 
The relative size of the tentacles and their position are not fully clear, wherefore 
further investigations are required to prove whether this species reaUy 
belongs to the genus in question or is to he referred to Orcula, in which 
case the diagnosis of the latter genus must be changed. 
Phyllophorus ehrenbey'gii {Urodemas), Selenka, 1868; Semper, 1868. 
Fifteen larger tentacles in the outer crown, and five smaller in the inner. Deposits — 
numerous spinous, not perforated rods, arranged three and three ; one always 
thicker and longer than the other two. Calcareous ring, as it seems, of ten 
simple pieces, the radial considerably larger and carrying two posterior prolonga- 
tions, which are simple and not divided into joints. 
Habitat. — Bed Sea (Selenka). 
Phyllophorus frauenfeldi, Ludwig, 1875. Phyllophorus, n. sp.. Semper, 1868. 
Fifteen larger tentacles in the outer crown, and five smaller in the inner. Deposits 
like those in the preceding species, consisting of rods with four simple or 
bifurcate spines round the middle and four simple ones at each end. Calcareous 
ring of ten simple pieces, the radial slightly larger and bearing posteriorly two 
slender prolongations divided into joints. 
Habitat. — Bed Sea (Ludwig, Semper). 
Semper also figures a rosette-shaped body found in the perisome, but there is nothing 
mentioned about such in the description of Ludwig ; he only refers to the figures 
given by Semper. For my own part I cannot refrain from supposing that 
Phyllophorus chrenbergii and Phyllophorus fraumfddi are very nearly related, 
and that they may prove to be identical. 
2. Deposits — plates either of a more common sha'pe, or hutton-lihe, or rosette- 
Phyllophorus dobsoni, Bell, 1883. 
Twelve tentacles in the exterior crown and six in the interior. Pedicels irregidarly 
distributed, hut scarce or absent in the central portion of the ventral surface. 
Deposits— numerous thick, discoidal bodies, with serrate margin, with a few 
(about four) small perforations and a number of minute conical knobs. 
