478 
MR. H. N. MOSELEY ON THE STRUCTURE OE THE STYLASTERID7E. 
gonangium in all stages of development. Spadix cup-shaped, developing, as in 
Errina, into a fringed network at the margin. A solitary ovum developed in relation 
with each spadix. Planula very long and worm-like. 
Genus Distich opor a, Lamarck (Plate 35, figs. 6 and 1G). — Corallum branching 
flabelliform with branches usually flattened in the plane of the flabellum ; composed 
of very compact coenenchym. Pores confined to narrow lines or rows running along 
the exact centres or edges of the sides of the branches, generally absent on their faces, 
except as occasional abnormalities or rudimentary branchlets budding in a direction 
out of the plane of the flabellum. The lines of pores composed of three rows, a central 
row of larger gastropores with circular or oval mouths ; and a row on each side of this 
of smaller dactylopores, sometimes very minute, often slit-like in aperture, the length 
of the slit being directed at right angles to the line of the row. Pores very deep, 
prolonged in curved lines side by side in the plane of the flabellum, inwards and down- 
wards towards the bases of the branches ; form inn thus throughout the flabellum a 
thin continuous tract of fragile tubulate tissue, in which the successively-developed 
curved pore-tubes stand out fanwise, separating from one another the compact masses 
of coenenchym forming the opposite faces of tire branches. The branches may there- 
fore be readily split into two halves along this tubular tract. Older gastropores 
with immensely long filiform styles. Styles much shorter in the younger gastropores. 
Dactylopores devoid of styles. Ampullse sometimes on one, sometimes on both faces 
of the flabellum, prominent and often forming confluent masses. Soft structures 
unknown.* 
Species of Stylasterid/e at present known. 
A list of all the species of Stylasteridse, at present described, here follows. The list 
is not to be considered as constituting a revision of the species. Access has been had 
to only a limited number of specimens, and as in the case of many of the species good 
figures, or indeed any figures at all, are wanting, and the descriptions founded on a 
false theory as to the nature of the organisms described are necessarily imperfect, a 
revision has not been found possible. Indeed, such can only be carried out when the 
soft structures of more species shall have been examined. The list, such as it is, 
represents an attempt to draw attention to all the species of which an account has 
been published. Few references are given, those only in each case being selected 
which are the latest and will supply all further references required when consulted, or 
those which indicate figures of the species described. The localities are appended in 
most instances in order to show the distribution of the members of the family. 
* See Postscript, p. 502. 
