244 F. R. Cou-per Reed — A Neio Carboniferous TriloUte. 



The fewer glabellar furrows of PMll. laticaudata (Woodw.), the 

 ornamentation of the axis of the pygidium, and the non-bifurcation 

 of its pleurse, compel us to regard this species as distinct, though it 

 agrees in the shape of the pygidium and number of axial segments. 



Phill. scahra (Woodw.) shows several points of resemblance, i.e., 

 the non-elongation of the genal angles into spines, the striated 

 border of the free cheeks, and the large eyes ,* but the shape and 

 furrows of the glabella and the pygidium are quite different. 



Phill. quadrilimba (Phillips) and FJiill. carinata (Salter) are com- 

 pletely unlike Phill. cracoensis so far as they are known. 



In Phill. Leei (Woodw.) the pleurae of the pygidium are grooved, 

 the neck-ring of the head is widest in the centre, the margin of the 

 head is ornamented with parallel lines ; but the eyes, the fixed 

 cheeks, the glabellar furrows, and number of rings in the axis of the 

 pygidium are different. Phill. Cliffordi (Woodw.), of which the 

 head-shield resembles that of Phill. Leei, has bifurcated pleurge in 

 the pygidium, but there are thirteen rings on the axis, and these are 

 unornamented. Phill. minor (Woodw.) has also bifurcated pleurse 

 on the pygidium, but fourteen unornamented segments on the axis 

 and an entirely different head-shield. Phill. articulosa (Woodw.) 

 shows no important points of resemblance, nor does Phill. Van der 

 Grachti (Woodw.). ^ Phill. Polleni (Woodw.), ^though agreeing with 

 Phill. cracoensis in the shape of the pygidium, the faint pleuree, and 

 course of the facial suture, is in other respects unlike it, but 

 Dr. Woodward considers it allied to Phill. Colei. 



The pygidia on which the species Griffithides ? carringtonensis 

 (Ether. MS.) was founded resemble our new species in possessing 

 twelve axial rings and grooved pleurse, but differ in having a distinct 

 flattened margin and absence of ornamentation. 



Amongst foreign species there is none with which I am acquainted 

 possessing any close affinity with this new one from Cracoe. 



The points of resemblance of this species to the genus Proetus, 

 which has been recorded from the Carboniferous System, though only 

 doubtfully in the British Isles,^ are of special interest. Dr. Woodward 

 (loc. cit.) has clearly pointed out the affinities of Griffithides, Phillipsia, 

 and Proetus, and this species seems still more completely to bridge 

 over the gap between the two last genera, so that it is even possible 

 to hesitate to which genus we ought to assign it. The features which 

 indicate its very close alliance with Proetus are : (1) the course of 

 the facial suture cutting the front margin nearly at a right angle, 

 instead of curving inwards so as to cut it at an acute angle, as in the 

 typical Phillipsia ; (2) the presence of the small lateral lobes on the 

 neck segment, which are distinctly recognizable, though obsolescent ; 

 (3) the few pleural furrows on the pygidium (when not decorticated) ; 

 and (4) the presence of a distinct fulcrum on the anterior pygidial 

 pleurae. By these characters it is differentiated from all the species 

 of Phillipsia, but the numerous other points of similarity to various 



1 Geol. Mag., Dec. IV, Vol. I (1894), p. 485. 



» Ibid., p. 487. 



3 Woodward: Men. Brit. Carb. Trilob., 1883, p. 55. 



