PLATE XXIX. 



(All the specimens figured on this plate are from the Silu- 

 rian limestone of the Ekwan River.) 



Megalomphala robusta (page 257). 



Figure 1. Side view of the speoinien referred to in the description of this species, as 

 shewing the " small, narrow, thin transverse ridges, with flat spaces 

 between them." 



Gyronema speciosum (page 258). 



Figure 2. Dorsal view of the more perfect of the two specimens collected. 



Gyeonema Dowungii (page 259). 

 Figure 3. Dorsal view of the type and only specimen collected. 



Gyronema brevispira (page 259). 



Figure 4. Dorsal view of a nearly i>erfect specimen of this species, very slightly 

 restored. 



Oethonychia obtusa (page 260). 



Figure 5. Side view of a specimen of this species. 

 II 5(1. Another view of the same. 



Platyceras compactum (page 260). 

 Figure 6. Dorsal view of the largest and most perfect specimen known to the writer. 



DiAPHOROSTOMA PERFORATUM (page 261). 



Figure 7. View of the upper half of the shell of the type and only known specimen of 

 this species, 

 II 7 a. View of the lower half of the same specimen. 



