1870. ] DE RANCE—GLACIAL PHENOMENA. 641 
moidal plates; 7”, ridge or mucus-tube in the centre of ditto; 4, hour-glass- 
shaped plates or fin-supports; /, large ditto at the base of the dorsal and anal 
fins; m, ventral or thoracic plates; », compound columns in connexion with 
ditto; 0, great abdominal rods; p, mandibles; g, premaxilla; gq’, maxilla; 
r, clavicle; s, operculum; 7, preoperculum; wu, orbit; v, fragments of dark 
granular matter, apparently dermal. 
Pruate XLII. 
Fig. 1. General view of the restored skeleton of Dorypterus Hoffmannt. 
Fig. 2. Much enlarged view of three of the transverse rods and plates. 
Fig. 3. Much enlarged view of two of the plates and rods on the shoulder. 
Fig. 4. Portion of two rays of the dorsal fin, showing the joints. 
Pruatre XLITI. 
Fig. 1. Specimen of Dorypterus Hoffmanni, exhibiting the head, ventral plates, 
and ventral fin in good order. 
Fig. 2. Another specimen, exhibiting the tail, pectoral fins, base of dorsal fin, gill- 
covers, ventral plates, the skin, and the various plates and rods. 
Fig. 3. Specimen of Dorypterus Hoffmanni, exhibiting the dorsal fin, pectoral 
fins, and lateral plates with the lozenge-shaped areas and ridges or 
mucus-tubes, 
Fig. 4. Specimen of Dorypterus Hoffmanni, exhibiting the dermal plates with 
the lozenge-shaped areas and ridges or mucus-tubes, particularly the 
plates on the shoulder with the upper line of ridges or mucus-tubes. 
6. On the GuactaL PurnomEena of WestERN Lancasuire and CuE- 
sHirE. By C. KE. Dr Rance, Esq., F.G.S8., of the Geological Survey 
of England and Wales*. 
Tue first notice of any importance of the drifts of Western Lan- 
cashire was made in 1832, by Sir Roderick Murchison, who de- 
scribed the occurrence of sands and gravels with marine shells in 
the neighbourhood of Preston y. 
In 1837, the Rev. W. Thornber described the sands and gravels 
of Blackpool as containing more than 20 species of marine shells +. 
These sands have since proved to be of the same age as those of 
Preston, and to belong to the middle drift. 
In 1841, Mr. Binney published his classification of the drifts 
around Manchester, which he divided as follows :— 
RECENT.........0000++ a. Valley-gtravels and River-terraces. 
6. Forest Sand, of Kersal Moor, &c. 
\" Till, or Bouider-clay. 
d. Sand, generally local. 
This order he adopts in his “Notes on the Lancashire and 
Cheshire drifts”§, read in 1842; and he adapts the same classifica- 
tion, to a certain extent, to the cliff section at Blackpool in his 
“« Notes on the Drift Deposits near Blackpool” ||, read in 1852. 
* Communicated with the permission of the Director-General. 
+ Report of the Brit. Assoc. 1832. 
{ History of Blackpool. 
§ Trans. Man. Lit. & Phil. Soc. yol. vii. (new series), p. 204. 
|| bid, vol. x. p. 128. 
