192 REPORT—1874. 
EXPLANATION OF THE PLATES. 
All the figures are reduced to one length. ‘The natural dimensions are given in the 
text.. The bones are lettered thus :—Pmz, Premaxilla; Mz, Maxilla; Na, Nasal; La, La- 
chrymal; PFr, Prefrontal; Fr, Frontal; P¢Fr, Postfrontal; Pa, Parietal; P¢O, Post- 
orbital; Sg, Squamosal; SO, Supraoccipital; Ep, Epiotic; Ju, Jugal; QJ, Quadrato- 
jugal; Q, Quadrate; Pal, Palatal; Vo, Vomer; P2, Pterygoid, 
Prats LY. 
Figs. 1, 2. Slightly altered from Von Meyer's ‘Saurier des Muschelkalkes,’ t. lxi. figs. 4, 5. 
8, 4. Reduced from Burmeister’s ‘Trematosaurus,’ tt. i., li. 
Puate V. 
Fig. 1. Slightly altered from Von Meyer’s ‘Saurier des Muschelkalkes,’ t. lxi. fig. 10. 
2. Chiefly from specimen in the British Museum. 
3. Adapted from Huxley’s Appendix to Howell’s ‘Memoir on the Warwickshire 
Coalfield” &c. (Mem. Geol. Survey), figs. 1, 2. 
4, Adapted from Prof. Owen’s figure, ‘Quart. Journ. Geol. Soc.’ vol. xi. t. ii. 
Puates VI. 
Fig. 1. From Waldheim’s “Notice” &c., Bull. Soc. Naturalistes de Moscou, tom. xx. t. v. 
2. Chiefly from Embleton & Atthey, ‘Ann. Nat. Hist.’ ser. 4, vol. xiv. t. iv. 
3, 4. Adapted from Hancock & Atthey, ‘Nat. Hist. Trans. Northumberland and Dur- 
ham,’ vol. iv. t. iv. 
Puate VII. 
Fig. 1. Partly from Hancock & Atthey, ‘Nat. Hist. Trans. Northumberland and Durham,’ 
vol. iii. t. ii. fig. 1. The conjectural restoration (in dotted lines) from the recent 
Menopoma. 
2. Adapted from Huxley, ‘Trans. Royal Irish Acad.’ vol. xxiv. t. xix. 
3. Reduced from Von Meyer's ‘ Reptilien’ &c., t. A. 
4. Compiled from various fragments figured by Von Meyer in the same work. 
Second Report of the Committee, consisting of Professor Harxness, 
Prof. Prestwicu, Prof. Hucusrs, Rev. H. W. Crosskey, Prof. W. 
Boyp Dawkins, Messrs. C. J. Woopwarp, Grorcze Maw, L. C. 
Misti, G. H. Morton, and J. E. Lee, appointed for the purpose of 
recording the position, height above the sea, lithological characters, 
size, and origin of the more important of the Erratic Blocks of 
England and Wales, reporting other matters of interest connected 
with the same, and taking measures for their preservation. Drawn 
up by the Rev. H. W. Crosskey, Secretary. 
Your Committee, in fulfilment of the duty entrusted to them, prepared and 
distributed a schedule of questions having reference both to isolated erratic 
boulders and groups of boulders, defining boulders as masses of rock trans- 
ported by natural agency from some locality more or less remote. The sche- 
dule was adapted from one issued by the Edinburgh Boulder Committee 
(quoted in the last Report); but it was thought desirable to extend its scope 
so as to include groups of boulders as well as isolated specimens, and to 
place no limit of measurement to the definition. 
As far as possible also the schedule has been made complete, and the ques- 
tions asked have been extended to details of considerable scientific importance. 
The following is a copy of the schedule issued :— 
