LOCALITIES IN " SILURIA." 93 



In the National Collection are also a jaw-foot and several united body-segments of 

 Pterygotm} obtained by Mr. Charles Ketley, of Smethwick. Other remains of the same 

 genus are, Mr. Woodward informs me, to be seen in the cabinets of Mr. E. Hollier and 

 Mr. Henry Johnson, of Dudley. 



Some of these specimens may be referable to Pterygotus problematicus, giving to this 

 species a very wide range in time, as we find its remains in the Upper Llandovery Sand- 

 stone, the Wenlock series, the Ludlow rock, and possibly in the Passage-beds. 



3. — Aymestry Rock. 



The next oldest rock bearing evidence of the existence of Pterygotus, that I am aware 

 of, is indicated by the discovery of a "jaw-foot " of Pterggotus by myself in the Aymestry 

 rock of Gorstley, near Newent, many years ago. This specimen was forwarded to Sir 

 Roderick Murchison, and is now in the Museum at the College, Great Malvern. This 

 rock is quarried to some extent at Gorstley, and is somewhat remarkable for containing 

 nests of beautiful spicules of the sulphuret of nickel. I have seen the internal casts of 

 Bhynchonella Wihoni filled with these spicules. 



4. — Lower Ludlow Rocks. 



The next stratified rocks in which we find remains of Pterygotus, and also of 

 Eurypterus, are the Lower Ludlow beds of Church Hill, Leintwardine. They are shaly 

 beds, which occupy the uppermost strata of this formation, and have furnished the 

 beautiful series of fossil Star-fishes and Crustaceans found by Mr. Lightbody, Mr. Marston, 

 and other geologists. In these strata also was discovered the Scaphaspis ludensis, by Mr. 

 John Edward Lee, of Caerleon. This Fish is at present the oldest known form of verte- 

 brate life. We have visited this quarry in company with Mr. Lightbody and Mr. Marston 

 more than once. The section is now nearly destroyed, as the quarry is almost filled 

 up. The remains of Pterggoti have been found all through the beds ; and in 1865 a new 

 species of Eurypterus from them was described by Mr. Henry Woodward. 



We were conducted by Mr. Marston to a quarry in a lane called " The Old Road," 

 near to Leintwardine, where the shale is found between masses of the Pentamerus Knightii 

 limestone, and where also Pterggoti have been found. This Pentamerus Knightii lime- 

 stone is more or less associated at Leintwardine with the uppermost layers of the Lower 

 Ludlow Rock, and is not altogether on the same horizon as the so-called " Aymestry" or 



1 The ornamentation upon these and other portions resembles that figured and described by Mr. Salter 

 as Pterygotus (now Eurypterus) punctatus. — H. W. 



