PLATE XXVII. 



LiNCKiA sp., n. sp. (Page 100.) 

 From the Lower Chalk. 



Fig. 



1. Actinal aspect; natural size. (Coll. Brit. Mus., E. 5055.) 

 a. Actinal aspect of portion of arm ; magnified -i diameters. 



Ophiuba Frnuu, u. sp., ex Forbes, MS. (Page lOo.) 

 From the Flint Gravel. 



2. Actinal aspect, natui'al size. (Coll. Norwich Mus.) 



a. Cast of actinal aspect in region of mouth ; magnified 4 diameters. 



b. Abactinal aspect; natural size. 



Opuiura sebrata, Roemer. (Page 102.) 

 From the Upper Chalk. 



3. Abactinal aspect; natural size. (Coll. Brit. Mus., E. 5043.) 



a. Abactinal aspect of segment of disc and two arms ; magnified 4 diameters. 

 h. Abactinal view of two isolated vertebral ossicles of another specimen ; mag- 

 nified 9 diameters. (Coll. Brit. Mus., E. 504G.) 



c. Side view of the same ossicles ; magnified '.) diameters. 



</. Anterior view of the same ossicles ; magnified 9 diameters. 

 e. Posterior view of the same ossicles ; magnified 9 diameters. 



OphiuPvA parvisentum, n. sp. (Page 103.) 

 From the Upper Chalk. 



4. Abactinal aspect of type specimen; natural size. (Coll. Brit. Mus., E. 5052.) 

 a. Abactinal aspect of portion of one arm ; magnified 6 diameters. 



