PLATE XXIX. 



PYCINASTER CRASSUS, n. sp. (Page 96.) 



From the Upper Chalk. 

 FIG. 



1. Actiiial aspect of a small specimen; natural size. (Coll. Brit. Mus., E. 2576.) 



2. Abactinal aspect of surface of arm of type specimen; natural si".e. (Coll. Brit. Mus., 35498.) 

 a. Supero-margiual plate ; magnified 3 diameters. 



3. Supero-margiual plate ; natural size. (Coll. Brit. Mus., E. 2631.) 

 a. Side view of same ossicle ; natural size. 



4. Isolated ventro-lateral plate; magnified 2 diameters. (Coll. Brit. Mus., E. 2632.) 

 a. Isolated plate from abactinal surface of disc ; magnified 2 diameters. 



5. Madreporite; natural size. (Coll. Brit. Mus., E. 2628.) 



PYCINASTER SENONENSIS, Valette, sp. (Page 95.) 

 From the Upper Chalk. 



6. Outer view of abactiual ossicle of disc ; natural size. (Dr. Blackrnore's Collection.) 

 a. Side view of same ossicle ; natural size. 



NYMPHASTER BUGOSUS, n. sp. (Page 94.) 



From the Lower Chalk. 



7. Actinal aspect ; natural size. (Coll. Brit. Mus., 57516.) 

 a. Infero-marginal plate ; magnified 6 diameters. 



STAURANDERASTER ARGUS, n. sp. (Page 99.) 

 From the Upper Chalk. 



8. Actinal aspect ; natural size. (Dr. Blackmore's Collection.) 

 a. One of the ventro-lateral plates ; magnified 2 diameters. 



9. Inner view of three ossicles isolated from a specimen in the British Museum; figured by Forbes ; 



magnified 2 diameters. E. 2566. [See also Plate XXV, fig. 6.] 

 a. Outer view of same ossicles ; magnified 2 diameters. 



ARTHRASTER CRISTATUS, n. sp. (Page 93.) 

 From the Upper Chalk. 



10. Side view of segment of arm, restored ; natural size. (Dr. Blackmore's Collection.) 



a. Outer view of a radiale ; magnified 4 diameters. 



b. Side view of same ossicle ; magnified 4 diameters. 



ARTHRASTER DIXONI, Forbes, sp. (Page 91.) 

 From the Upper Ckalk. 



11. Ossicle from abactiual surface of disc; natural size. (Coll. Brit. Mus., E. 5024.) 

 a. The same ossicle ; magnified 3 diameters. 



METOPASTER CORNUTUS, Sladen, sp. (Page 117.) 

 From the Upper Chalk. 



12. Ultimate supero-marginal plate of adult specimen; magnified 2 diameters. (Dr. Kowe's 



Collection.) 



OPHIOTITANOS MAGNUS, n. sp. (Page 106.) 



From the Lower Chalk. 

 13. Abactinal aspect ; magnified 2 diameters. (Coll. Sedgwick Mus., Cambridge.) 



