MESSES. P. MAETIN DUNCAN AND H. M. JENKINS ON PALiEOCOEYNE. 699 
Description of the Plate. 
PLATE LXVI. 
Illustrating the Structure of Paleeocoryne. 
Fig. 1. Portion of the trophosome of Palceocoryne Scoticum, showing the fluted periderm 
of the hydrocaulus, the cellular and dactylose processes of the hydrorhiza, and 
the base of three of the tentacles Magnified 15 diameters. 
Fig. 2. Portion of the trophosome of Palceocoryne radiatum, showing the same organs 
as fig. 1. Magnified 15 diameters. 
Figs. 3 & 4. Partial sections of similar portions of the trophosome of two individuals, 
showing the cellular nature of the hydrorhiza, the tubular nature of the 
hydrocaulus, and its connexion with the cavity of the polypite and the tubu- 
lated tentacles. Magnified 15 diameters. 
Fig. 5. Hydrocaulus and polypite of Palceocoryne radiatum, showing the number and 
arrangement of the tentacles. Magnified 15 diameters. 
Fig. 6. Hydrocaulus of Palceocoryne Scoticum, showing the relation of the hydrozoon to 
a portion of a polyzoarium of Fenestella. Magnified 1 5 diameters. 
Fig. 7. Polypite, metastome, and tentacles of a specimen of Palceocoryne radiatum, 
showing their external structure and relations. Magnified 10 diameters. 
Fig. 8. Side view of a trophosome of Palceocoryne radiatum, showing the hydrorhiza, 
hydrocaulus, polypite, and portions of the tentacles. Magnified 15 dia- 
meters. 
Fig. 9. Upper surface of the polypite of a species of Palceocoryne , showing the external 
ornamentation and the arrangement of the tentacles. Magnified 30 dia- 
meters. 
Fig. 10. A similar specimen ground down to show the internal structure of the polypite. 
Magnified 30 diameters. 
Fig. 11. Portion of the hydrosome of Palceocoryne radiatum, showing the upper surface 
of the polypite, portions of some of the tentacles, part of the hydrocaulus, 
and an appendage to the latter supposed to form part of the gonosome. 
Magnified 25 diameters. 
