280 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



g'. Side plates reduced to a spicule, or to a group of spicules. 

 Neocomatella alata. Heterometra hengalensis. 



yeocomaieUa pulchella. Eeterometra compta. 



Capillaster muUirad'wtn. Heterometra pulchra. 



Comatula rotalaria. Eeterometra reynaudii. 



Comatula solarif. Heterometra quinduplicava . 



Comatula pectinata. Homalometra denticulata. 



Comactinia meridionalis. Amphimetra discoidea. 



Comaster multibrachiata . Amphimetra parilis. 



Craspedometra acuticirra. Oxymetra nranea. 



Heteroiitctra crenulata. Tropionietra macrodiscus. 



Heterometra savignii. Tropiometra afra. 



Heterometra philiberti. Tropiometra picta. 



e'. Covering plates reduced to straiglit or curved rods, Init side plates couiposeiJ 

 of a delicate reticulation. 

 EumorpJiometra concinna. Pentametrocrinus japonicus. 



Thaumatocrinus Vorealis. Pentametrocrinns varians. 



Pentametrocrinus tiiherculatus. 

 d'. Botli side and covering plates spiculiform. 



Neocomatella pulchella. Eudiocrinus venustulus. 



Neoconiatella alata. Himerometra hartschi. 



Capillaster itiultiradiatir. Heterometra quinduplicava. 



Nemaster ruiiginosa. Amphimetra parilis. 



Leptonemaster venustux. Lamprometra gyges. 



Zygometra comata. Cyllometra aliopurpurea. 



Eudiocrinus indivisus. Decametra mylitta. 



Eudiocrinus junceus. Oligometrides adeonw. 



Eudiocrinus pinnatus. Eumetra chamlerlaitii. 



b'. Only a single series of plates present. 



c'. The perisome of tbe pinnules is completely occupied by n continuous series of large 

 imbricating plates. 

 Beliometra glaciaUs. Anthometra adriani. 



Promachocrinus kerguelensis. Leptometra celtica. 



(-•'. The ambulacra! lappets contain plales. rods, or spicules, which are entirely inde- 

 pendent of those on either side, 

 d'. Each lappet contains a definite plate. 



e'. The plates are strongly convex outwardly, and usually large. 

 Nemaster grandis. Nemaster ruhiginosa. 



Nemaster iouensis. ComatiUa iridometriformis. 



e°. The plates are plane, or nearly so. 



f. The plates are small, triangular, and confined to the apices of the 

 la ppets. 



Atclecrinvs sulcatus. 



f. The plates are large, and are continued downward almost or quite to the 

 pinnulars. 

 ff. The plates are fan-shaped. 



Sarametra triserialis. 



ff'. The plates have approximately parallel sides. 

 7^'. The plates are ver.v broad, oval in outline. 



