PLATE XVII. 



Metopaster Mantellt, Forbes, sp. (Page 38.) 



From the Upper CI alii. 



Fig. 



1. Actiual aspect ; natural size. (Coll. Brit. Miis., ^04-02.) 

 a. Infero-marginal plate ; magnified 4 diameters. 



MiTRASTER coMPACTus, Furhps, sp. (Page ^7.) 

 From the Upper Challi. 



2. Actinal aspect ; copied from Forbes in Dixon's ' Geology of Sussex,' pi. xxii, 



fig. 3. 



CoMPTONiA CoMPTONi, Forbes, sp. (Page 69.) 

 From the Upper Greensaiui. 



3. Actinal aspect ; natural size. (Coll. Brit. Mus., 3-i31 1 .) 

 a. Infero-marginal plate ; magnified 3 diameters. 



h. Lateral view of interbrachial arc ; natural size. 



CoMPTONiA elegans, Graij. (Page "].) 

 From the Upper Greensand. 



4. Abactinal view ; natural size. (Coll. Brit. ]\Ius., E. 2567.) 

 a. Actinal view of same specimen; natural size. 



