240 : | Reports and Proceedings. 
EKurypterus acuminatus, Salter ; Old Red Sandstone, Ludlow. 
E. Brewsteri, H. Woodw. (sp. nov.) ; Old Red Sandstone, Forfarshire. 
KE. pygmeeus, Salter ; Upper Ludlow Rock, Kington, and Old Red Sandstone, 
Forfarshire. 
K. lanceolatus, Salter ; Upper Ludlow Rock, Lanarkshire. 
KE. linearis, Salter; Upper Ludlow Rock, &c., Kington. 
E. abbreviatus, Salter; Upper Ludlow Rock, Kineton. 
E, chartarius, Salter; Upper Ludlow Rock, Lanarkshire. 
2. PrERYGoTUS, Agassiz. 
Pterygotus Anglicus, 4g.; Old Red Sandstone, Forfarshire, &e. 
Pt. minor, HZ. Woodw. (sp. nov.); Old Red Sandstone, Forfarshire. 
Pt. Ludensis, Salter; Old Red Sandstone, Ludlow. 
Pt. problematicus, Salter; Old Red Sandstone and Upper Ludlow Rock, 
Ludlow, &ce. 
Pt. stylops, Salter; Upper Ludlow Rock, Herefordshire. 
Pt. Banksii, Salter; Upper Ludlow Rock, Herefordshire. 
Pt. gigas, Salter; Upper Ludlow Rock, Herefordshire. 
Pt. perornatus, Salter; Upper Ludlow Rock, Lanarkshire. 
Pt. bilobus, Salter; Upper Ludlow Rock, Lanarkshire. 
Pt. arcuatus, Salter, Lower Ludlow Rock, Leintwardine. 
3. Simoni, Page. 
Slimonia acuminata, Salter, sp.; Upper Ludlow Rock, Lanarkshire. 
SL (Pterygotus) punctata, Salter, sp.; Upper and Lower Ludlow Rocks, 
Westmoreland and Shropshire. : 
SL scorpioides, Salter, MS.; Upper Ludlow Rock, Lanarkshire. 
4, StyLonvurvs, Page. 
Stylonurus Powriei, Page; Old Red Sandstone, Forfarshire. 
St. Scoticus, H. Woodw. (sp. noy.); Old Red Sandstone, Forfarshire. 
St. ensiformis, H. Woodw. (sp. nov.) ; Old Red Sandstone, Forfarshire. 
St. (Hurypterus) Symondsii, Salter, sp.; Old Red Sandstone, Herefordshire. 
St. (Eurypterus) megalops, Salter, sp.; Old Red Sandstone and Upper Lud- 
low Rock, Ludlow. 
St. Logani, HZ. Woodw. (sp. noy.);, Upper Ludlow Rock, Lanarkshire. 
5. Hnmraspis, H. Woodw. (genus nov.). 
Hemiaspis limuloides, Salter, MS. 
ae Me MS Lower Ludlow Rock, Leintwardine. 
H. sperata, Salter, MS. 
Descriptions of some of the new forms will be found in the present 
Number of this Magazine; and the whole will be embodied in a 
Monograph for the Paleontographical Society. 
On THE CONCLUSION TO BE DEDUCED FROM THE PHYSICAL STRUCTURE OF SOME 
Merronitrs. By H.C. Sorsy, F.R.S., F.G.8. 
(eats microscopical study of thin sections of meteorites had led 
the author to conclude that their earliest condition of which we 
have evidence was that of igneous fusion, as indicated by the crystals 
of olivine containing ‘ glass-cavities,’ like those characteristic of the 
minerals in terrestrial volcanic rocks. (See Quart. Jour. Geol. Soc., 
vol. xiv. p. 453; and Proceed. Roy. Soc., vol. xiii. p. 333.) There 
