280 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



rf. Side plates reduced to a spioule, or to a group of spicules. 

 Neocomatella alata. Heterometra oengalensis. 



Neocomatella pulchcJIu. Heterometra compta. 



Capillaster muWradiata. Heterometra pulchra. 



Comatula rotalaria. Heterometra reynaudii. 



Comatula Solaris. Heterometra quinduplicava. 



Comatula pectinatu. Homalometra denticulata. 



Comactinia merldionaUs. Amphimetra discoidea. 



(Jomaster multibrachiata. Amphimetra parilis. 



Craspedometra acuticirra. Oxymetra aranea. 



Heterometra erenulata. Tropiometra macrodiscus. 



Heterometra sarignii. Tropiometra afra. 



Heterometra pliililerti. Tropiometra picta. 



e*. Covering plates reduced to straight or curved rods, but side plates composed 



of a delicate reticulation. 



Eumorpliometra concinna. Pentametrocrinus japonicus. 



Thaumatocriniis torcalis. I'cntametrocrintis variant. 



Penlametrocrinus tuberciilatu*. 

 d*. Both side and covering plates spu-uliform. 



NeocomateUa pulcJtclla. Eitdiocrinus venustulus. 



Neocomatella alata. Himerometra bartschi. 



Capillaster i/niltinnlinln. Heterometra guinduplicava: 



Nemaster ruWginosa. Amphimetra parilis. 



Leptonemaster vcnustvx. Lamprometra gyges. 



Kygometra comata. Cyllometra anopurpurea. 



Eudiocrinus indivisuis. Decametra mylitta. 



Eitdiocrinus junceux. Oligometrides adeonce. 



Eudiocrhius pinnattifi. Eitmetra- clia.m'berlatni. 



6 a . Only a single series of plates present. 



c 1 . The perisome of the pinnules is completely occupied by a continuous series of large 



Imbricating plates. 



Heliometra glacialis. Anthometra adriant. 



Promachocrnnis kergnelensis. Leptometra celtwn. 



c'. The ambulacral lappets contain plak'S, rods, or spicules, which are entirely inde- 

 pendent of those on either side. 

 (?'. Each lappet contains a definite plate. 



e 1 . The plates are strongly convex outwardly, and usually large. 

 Nemaster nrandis. Nemaster rubiginosa. 



Nemaster ioH'ensis. ComatiHa. iridomctriforiuix. 



?. The plates are plane, or nearly so. 



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

 lappets. 



A telerrin a xnlcatn/i . 



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



pinnulars. 

 <7\ The plates are fan-shaped. 



Sarametra iriserialis. 



g". The plates ha^e approximately parallel sides. 

 h\ The plates are very broad, ovaT In outline. 



