PLATE IX. 

 (All the figures are of the natural size except fig. 1 b and fig. 4.) 



Fig. 1. — Geratiocaris Imdensis, H. Woodward. (See also Plate I.) la, two 

 segments and the caudal appendages (imperfect) of the natural size ; 1 b, the 

 terminal portion of the spine e, d, c. enlarged twice. Ludlow Museum. 

 (Page 34.) 



Fig. 2. — G. canaliculata, T. R. J. & H. W. Upper portion of a telson, 

 crushed and broken. Mr. Cooking's collection, Ludlow. (Page 31.) 



Fig. 3. — The same. Fragments of an ultimate segment and a telson. Mus. 

 Pract. Geol. (Page 31.) 



Fig. 4. — G. tyrannus {?), Salter. An abdominal segment (imperfect), enlarged 

 4 diam., to show its ornament. On the back of the slab with Physocaris vesica, 

 PI. VII, fig. 8, in Mr. T. J. Salwey's collection, Ludlow. (Page 24.) 



