112 
by Messrs. J. Waterliouse, M.A., and G. Steward, under considerable diffi- 
culties, and the Department is indebted to the Council of the Society for 
permission to use the specimen for illustrative purposes. 
Locality and Horizon. — Bow-wow Creek, Mount Vincent, near East 
Maitland, Co. Northumberland {3Iessrs. J. Waterhouse, M.A., and G. 
Steward — Collection Maitland Scientific Society): — Muree Rock, Upper Marine Series. 
PiiiALOcmNUS ? NODOsus, sp. nov. 
PI. XIY, Figs 4i and 5. 
Sp. Char, — Calyx very depressed saucer-shaped ; basal concavity wide 
and open, wholly containing the iufra-basals, and a portion of the basal plates. 
Infra-basals relatively largo. Basals proportionately very large, thick, strong, 
and arched, each bearing centrally a blunt, prominent boss, on which the 
calyx rests when placed in its normal position ; posterior basal less convex 
than the others. Badial plates not preserved, but their impressions convey 
the idea of low, transversely elongated, thick plates, and the anal on the 
truncated surface of the posterior basal similar in character. Sculpture (of 
the cast) consisting of concentric lines parallel to the margins of each plate 
surrounding the central boss. Stem-facet apparently absent. 
Obs. — The number, form, and arrangement of the infra-basals and 
basals, and almost certainly that of the radials also, render this Crinoid con- 
generic with P. Koninchii, and P. princeps. The low height of the calyx, 
the wide, open l)asal concavity, and the central elevations of the basal plates 
are features wliich at once tend to separate P. nodus from the foregoing 
species. It rests on the apices of the basal nodes after the manner of a tripod 
on its three legs. 
The iDasi-radial sutures arc so much curved that a quadrangular 
aspect is given to the basals, but the articular margins arc all sufficiently 
angular to give a 2 ientagonal outline to the plates. 
The specimen is a decorticated cast, and consists of infra-basals and 
basals, with the wide, low, articular surfaces of thick radials, and the anal 
plate. A cast was submitted to the late Dr. P. II. Carpenter, who agreed 
with the Yvh’iter as to its affinity with P. Konincki and Id. princeps. 
