390 W. B. R. King— A Neiv Trilobite 



stomata in these Palaeozoic types and those of certain Cycads 

 described by Messrs. Thomas and Bancroft.' 



In conclusion I would like to express my gratitude to Professor 

 A. C. Seward for many valuable suggestions and criticisms, and to 

 Mr. Hamshaw Thomas, of Downing College, Cambridge, who gave 

 me numerous useful hints on the methods of preparing and mounting 

 the cuticles. I wish also to thank my brother, Mr. L. J. Wills, 

 for very kindly placing the material at my service and for his 

 encouragement during this research. 



EXPLANATION OF PLATES. 

 Plate XXX. 

 Fig. 1. Neuropteris heterophylla, Brongn. Leaflet, x about 4. 

 ,,2. ,, ,, Stomata S, water-stomata W. X 50. 



,, 3. ,, ,, Group of stomata. x 50. 



,, 4. ,, ,, Stomata. x about 167. 



,,5. ,, ,, Glandular patches G, stomata S. x 50. 



Plate XXXI. 

 Figs. 6, 7. Cyclopterissp. Type a. Two surfaces of same leaflet. Stomata S, 



water-stomata W. x 50. 

 Fig. 8. The cuticle of a dichotomously branched thalloid structure. X 17. 

 ,, 9. Alethopteris sp., showing rows of stomata. x about 24. 

 ,, 10. Alethopteris sp., stomata, guard-cells G.C. x about 167. 

 ,, 11. Cordaites sp., stomata S. x 50. 

 The Text-figures are all camera-lucida drawings of the actual specimens. 



II. — A New Trilobite from the Millstone Grit of North 

 Yorkshire. 



By W. B. R. King, B.A., F.G.S. 

 (PLATE XXXII.) 

 r|1HE highest beds of the Carboniferous rocks of Wensleydale are 

 _L found on the summit of Great Shunner Fell, which is situated 

 on tbe watershed between Wensleydale and Swaledale, and forms the 

 high ground to the west of the Buttertub Pass on the road between 

 Hawes and Muker. 



At a point 650 yards south-west of the Currack of Great Shunner 

 Fell, called Shunner Fell Well on the 6 in. to a mile ordnance map 

 (Yorkshire, Sheet L), a thin band of limestone and calcareous shale is 

 seen forming a conspicuous feature. A detailed section of the beds 

 exposed at this locality shows about 12 feet of calcareous beds. The 

 limestone in question is described in the Geological Survey memoir on 

 The Geology of the Country around Ifallerstang, etc., where the 

 following description of the Millstone Grit of that area is given 

 "The overlying bed is a very thick shale, which forms the greater 

 part of Shunner Fell. In it there are two thin bands of fossiliferous 

 limestone, which are to be seen near Shunner Fell Well on the west 

 side of the hill. In one of these Mr. Goodchild found a trilobite. A 

 tiny outlier of grit forms the extreme top of Great Shunner Fell." ' 



■^ H. H. Thomas and N. Bancroft, op. cit., pp. 155-204. 

 ^ The Geology of the Country around Mallerstanq, etc. (Mem. Geol. Surv.), 

 1891, p. 145. 



