Segments and joints 



of Eurypterus, Hughmilleria, etc. 



1-8 These are all natural size drawings and 1-4, 7 appear to be 

 sternites, the transverse suture being clearly marked in all. 

 Figure 2 is a second sternite and bears the mark of the oper- 

 cular appendage. Figure 6 is a series of abdominal tergites ; 

 8 the half of a sternite (second?) with very unusual surface 

 markings. 

 9 Two joints of a slender grooved appendage (Stylonurus) with 

 denticulated ridges. 



10 Gnathobase of a swimming foot. 



11 The filamentous terminal joints of one (or two) large endog- 



nathites, probably of Stylonurus. 



Phyllocarida - 



Page 309 / 



See plate 6 



12 Telson and cercopod. x2 



13 The same parts of a very distinct species with heavy and long 



central spine with short lineate cercopods. 

 14-21 A series of fragments which afford no definite clew to the 

 original form of the bodies, but the enlargements accom- 

 panying each show the very peculiar character of the sur- 

 face engraving. There is no reason for assuming any asso- 

 ciation between these bodies and the tail spines already 

 referred to, but it is fairly certain that they can with entire 

 safety be regarded as Phyllocarid remains. They have been 

 found only in the gray shale beds lying at the top of the grit 

 and black shale series. 



