460 MR. H. 1ST. MOSELEY ON THE STRUCTURE OF THE STYLASTERDUE. 
The ampullar sacs are embedded in a mesliwork of offsets of the larger canals, and 
each of the gonophores is attached to one or more stout canal branches. 
Stout offsets of the deeper canal mesliwork traverse the interior of the pseudoseptal 
laminae, and especially near the summits of the pseudosepta large tortuous branches 
pass radially outwards between the dactylozooid sacs, and, branching at their outer 
extremities, join the surface network at the margins of the cyclo-systems (Plate 44, fig. 2). 
J ust over the outer extremities of each of the pseudosepta, at the margin of the top of 
each cyclo-system, and in the angles between the outer margins of the dactylopores, 
are situate ovoid nematophores. A single nematophore is placed in each above- 
described position. The nematophores are ovoid sacs, closely packed with about three 
tiers of nematocysts of the larger form, placed with their longer axes parallel to those 
of the containing sacs (Plate 44, fig. 2, N). 
The encloderm of the soft parts in the present form were observed to have, in the 
fresh condition, a dusky green colour. The pigment is soluble in alcohol, and yields a 
green solution, which produces a well-marked absorption-band in the spectrum when 
examined spectroscopically. The position of this band was, however, unfortunately 
not determined. 
Zooids. 
Dactylozooids . — The dactylozooids have bases of closely similar form to those of 
the dactylozooids in Stylaster densiccudis and Allopora profunda, and are attached 
in the same manner within their sacs with the exception that they have no styles. 
The free portions of the zooids differ, however, from those in the species just 
mentioned, in that they are in the contracted condition, longer, more slender, and 
more gently tapered towards the extremities. Moreover, instead of being retracted 
within them sacs in a vertical position, i.e., one parallel to the length of the sac, they 
are in the present form placed out of harm’s way by being doubled down within the 
mouth of the sac of the gastrozooid (Plate 41, fig. 1, D Z, D Z). 
Gastrozooids.— -The sac of each gastrozooid is narrowed at the horseshoe-shaped 
opening, already described as leading, in the corallum, from the upper chamber of the 
gastropore, to the lower chamber in which the gastrozooid lies. The sac is reflected over 
the surface of the tongue-like process, and passing into the lower chamber, becomes 
attached to the zooicl near the margin of its base. The tongue-like process projects in 
front of the mouth of the zooid, and must prevent the protrusion of the zooid, except 
in a crooked direction. 
The gastrozooid itself is basin-shaped below, with a cylindrical mass above, the 
bottom of which gradually expands to join the margin of the basin. The cylindrical 
upper portion has a flat top perforated by the mouth, which is in the form of a crucial 
slit, and is abutted on by regularly disposed elongate gastric cells of the endoderm. 
Numerous large canals are given off from the periphery of the lower basin -shaped 
portion of the zooid, but none from the under surface of the basin. The disposition 
of these canals has already been described. The gastrozooids are devoid of tentacles. 
