544 Dr. H. Woodward — Trilobites in the Culm of Devonshire. 



raised margin, and a rouuded central depression, the surface of 

 which is striated. 



The head of P. minor appears to us to be very distinct from any 

 of the species of Carboniferous Trilobites hitherto figured, but the 

 pygidium may be compared with P. Eicliwaldi; the axis, however, 

 in P. minor tapers more rapidly to a point. 



Formation. — Lower Culm. 



Locality. — Waddon-Barton, Devonshire. 



Drawn from a specimen preserved in the British Museum (Natural 

 History). 



Phillipsia Cliffoedi, H. Woodw., 1884. Plate XVI. Fig. 10. 



Phillipsia Gliffordi, H. Woodw. Pal. Soc. Mon. Carb. Trilob. part ii. 1884, p. 70, 

 pi. X. figs. 8 5, 9, 10, 11, 12. 



The head of this species resembles that of P. Leei, but the cheek- 

 spine is much shorter, and, the lateral furrows on the glabella are 

 more marked. The head is much distorted by cleavage, and its 

 accurate description is attended with some difficulty, the head being 

 imperfect. Thoracic segments unknown, probably nine in number. 



Pygidium. — The tail-shield is nearly twice as broad as it is long, 

 the axis is one-third of its breadth at the proximal border, but rapidly 

 diminishes to one-seventh at its bluntly-rounded extremity; here the 

 shield is bordered by a wide margin covered with fine concentric 

 strias (being an impression of the underside) ; the border is one- 

 seventh the length of the pygidium, but diminishes in width laterally. 

 The axis of the tail is composed of thirteen coalesced rings or 

 somites, and has ten lateral pleuree on each side ; these bifurcate 

 near their extremities as they approach the margin. There are no 

 puncta, spines or tubercles observable on this species. 



The pygidium of Pli. Gliffordi agrees most in general facies with 

 that of Ph. Colei, but in the former the pleuree are bifid at their 

 extremities, not simple as in the latter species. It may also be 

 compared with Ph. Carringtoniana,^ but the Culm form is broader 

 and shorter in proportion. 



I have much pleasure in dedicating this species to Lord Clifford, 

 of Ugbrook Park, Devonshire, upon whose estate the Culm is well 

 exposed. These Trilobites were discovered by Mr. Lee on one of 

 his lordship's farms at Waddon-Barton, and it was by his permission 

 that Mr. Lee secured a quantity of the shale to break up, resulting 

 in the discovery of the specimens here figured. 



Formation. — Lower Culm-shale. 



Locality. — Waddon-Barton, near Chudleigh, Devonshire. 



From Mr. J. E. Lee's cabinet. Villa Syracusa, Torquay. 



Phillipsia articulosa, H. Woodw., 1884. Plate XVI. Fig. 11. 



Fhillipsia articulosa, H. Woodw., Pal. Soc. Mon. Carb. Trilob. part ii. 1884, p. 71, 

 plate X. figs. 6 c, d, and 13. 



This species is based upon three pygidia of Trilobites having a 

 larger number of coalesced segments than any of the Culm specimens 

 ^ Incorrectly spelt Carringtonensis (see ante p. 48G). 



