131 
The ornamenting tubercles were, I believe, in the perfect condition 
prolonged into sj)ines. In PI. XXII, Pig. 16, is figured the right pleura of 
a tail in which the tubercles are so extended. 
Now a Avord as to Prof, de Koninck’s PliUlipsia semimfera, Phill. 
That it is not GriJJithides semimferus, Phill , sp., as this Trilohite is now 
called, is more than j)rohable ; indeed, the description of the glabella given 
by De Koninck, wherein he refers to the middle and anterior glabella grooves 
(“les sillons moyens et anterieur”), sets at rest in the negative the question 
of this being a Griffithides even. In all probability De Koninck’s Trilohite 
and the present pygidium are identical, and for this reason I have placed after 
the generic name at the head of these paragraphs a note of interrogation. 
Locality and Horizon. — Gardner and Cameron’s Conditional Purchase, 
Back Creek, Parish of Doon, Co. Durham {Pres. E. Ticynam, Chief SnrceyorJ ; 
Kean’s Gully, Parish of Tudor, Co. Durham {Ibid) ; Rouchel Brook, Ilunter 
River, Co. Durham {Ibid) : — Carboniferous. 
ADDENDUM. 
Familn—FLA TYCRINID^F. 
Obs. — PI. XX, Pig. 8 represents a portion of a calyx, referable, I 
believe, to Platycrinus. The figure is defective in so far that the dowiiAvard 
curvature of the exposed basals is not shown, nor are the excavated margins 
for the arms in the two radial plates facing the observer, hut between these, 
and partly resting on both is an interadial. The plates are ornamented with 
radiating lines of very peculiar wart-like tubercles, concave at their apices. 
The specimen Avill he refigured and described more in detail. 
Locality and Horizon. — Greenhills, Paterson to Dungog Ptoad, Co. 
Durham (C. Cullen^ : — Mirari Limestone, Carboniferous. 
