i iae a 
X. 
ON HEMITRYPA HIBERNICA, M‘COY, By GRENVILLE A. 
J. COLE, F.G.S., Professor of Geology in the Royal College of 
Science for Ireland. Puatz VIII. 
[Read January 18; Received for publication January 20; Published 
Marcu 25, 1893. ] 
In the Spring of 1892, Mr. R. Kirwan, B.a., brought me some 
specimens of Fenestellid polyzoa from the Carboniferous Limestone 
of Gardenfield, near Tuam, Co. Galway, which were covered over 
with what appeared to be an outer sheath (Pl. vim, fig. 5). Very 
short inspection sufficed to convince one that these were referable 
to Hemitrypa, Phillips; but, on examining the British literature 
relative to this genus, a certain chill was cast upon the investigation. 
Phillips (1, p. 27) described his type, Hemitrypa oculata, as 
‘a thin lamina of coral expanded in a cup-formed mass; external 
surface wholly covered with numerous round pores or cells, 
radiating from a centre, and associated in double rows, which 
near the centre undergo frequent division, so as to form two such 
_ rows. Internal surface marked with radiating ridges, corresponding 
to the external interstices between the rows ; between these ridges 
are many oval depressions, which penetrate only half through the 
substance of the coral, and nowhere reach the outer face. 
It grows to the size of two or three inches in diameter. The 
internal face was like that of some Fenestelle, but the peculiarities 
of the external surface seem to demand generic separation. ‘The 
specimens are extremely perfect. 
Locality.—In South Devon: Barton. 
The name is derived from jjuove, half, and rpvza, a perforation. 
The figure given by Phillips (1, pl. xiii., fig. 38) is only a sketch, 
and the type-specimen has not yet come to hand in the collections 
of the Museum of Practical Geology, London; but, by the kindness 
of Mr. H. 'T. Newton, I have there seen the fragment figured by 
Phillips as 88a. There is no doubt that the relations of the two 
