MESSES. P. MAETIN DUNCAN AND H. M. JENKINS ON PAluEOCOEYNE. 697 
to form a metastome, the periderm being granular and marked with ridges. Hydrorhiza 
more or less cellular within, broad and dactylose. 
Gonosome. — Gonoblastidia at the junction of the hydrocaulus and the body of the 
polypite (?). 
VI. Description of the species . — 
1. Palceocoryne Scoticum , nobis. 
2. Palceocoryne radiatum, nobis. 
1. Palceocoryne Scoticum. Plate LXVI. figs. 1 & 6. The trophosome is short. The 
hydrorhiza and the body of the polypite are nearly equal in size. The tentacles 
are about seven in number ; they are, when fully developed, several times longer than 
the hydrocaulus and are slender, tapering and irregular in their length, size, and 
distance ; their periderm is spined, and is marked with pits, grooves, dentations, and 
serrations; and it is generally ornamented above and below with ridges, which 
are continued on to the oral surface or downwards on to the sides of the polypite. 
The hydrocaulus is slender, terete or slightly polygonal, and its periderm is orna- 
mented with alternately larger and smaller flutings, pits, and small spines. 
The hydrorhiza has one or more cellular processes, and an ornamented polypary, 
and it grasps the margin of foreign bodies. 
The oral surface is either flat or slightly concave and granular ; or is convex and 
marked with radiating ridges terminating at the oral orifice and limiting the meta- 
stome. The oral opening is often invisible. 
Height of fossil without tentacles yu inch. Length of tentacles (extreme) ^ inch. 
Fixed on Fenestellce in the lower shales of the Carboniferous formation of Ayrshire 
and Lanarkshire. 
2. Palceocoryne radiatum. Plate LXVI. figs. 2, 5-8, 11. Trophosome. — The polypite 
body is small. The tentacles are from seven to eleven in number ; they are mode- 
rately long, equidistant, subequal, rounded, tapering, closely striated, faintly spined, 
and rarely marked with lateral dentations. The hydrocaulus is short, cylindrical, 
faintly bulging, ornamented with subequal rounded flutings, the periderm being 
abundantly pitted, but not spined. 
The oral surface is concave, and the projecting metastome is small. 
The gonosome. — Processes covered with periderm are developed from the base of 
the polypite near its junction with the hydrocaulus. Gonoblastidia'? 
Localities. — Auchenskeigh and Roughwood, Ayrshire, in the lower Carboniferous 
shales. 
The tentacles of Palceocoryne radiatum are shorter, stouter, and more finely striated 
than those of the other species. 
VII. Remarks. — The tenuity and length of the fully developed tentacles, and the 
manner in which some of them are curved and waved, indicate that, although their peri- 
derm was dense, there was some power of movement in them ; otherwise the slightest 
