22 BULLETIN 76, UNITED STATES NATIONAL MUSEUM. 



coordinate with the Notomyota. However, the orders of Asteroidea are even less 

 satisfactory than the famihes, and they will ever furnish an excellent bone of con- 

 tention, if the Notomyota is accepted, the Phunorozonia will become a superorder. 

 This will necessitate tlie creation of a new order for the Forcellanasteridse, and a 

 renrnin<:ement of Perrier's Paxillosa and Valvata. Perhaps some investigators will 

 find the following scheme acceptable: 



Phanerozonia. Marginal plates prominent; papuhe confined to abactinal area 

 circumscribed by the marginal plates. 



1. Order Cribellosa, new. Tube feet pointed, without sucking disk and with 

 single ampulhe ; cribriform organs; no intestine. 



Family Porcellanasteridie. 



2. Order Paxillosa Perrier, emended. Tube feet pointed, with double am- 

 pullse; abactinal plates paxilliform; superainbulacral plates; intestine present or 

 absent. 



Family Goniopectinidse. 

 Family Astropectinidie. 

 Famiij- Luidiidse. 



3. Order Notomyota Ludwig. Tube feet with sucking disks; a pair or dorsal 

 muscle bands present in rays; marginal plates alternate and spiny; pectinate 

 pedicellarise ; abactinal skeleton, reduced paxillte, or flat plates. 



Family Benthopectinidie. 



4. Order Valvata Perrier. Tube feet with sucking disks, and without other 

 characters of Notomyota; abactinal plates varying from paxilhform to flat tessel- 

 late; pedicellariiv bivalved, excavate, foraminate. 



Family Archasteridae. 

 Family ChaHasteridse. 

 Family Odontasteridse. 

 Family Goniasteridse. 

 Family Oreasteridae. 

 Family Linclciidce. 

 Family Asteropidae. 



Family PORCELLANASTERID^ Sladen, 1889. 



Phanerozonia with relatively thin and lamclliforra (not block shaped) marginal 

 plates, which are naked or covered with rather thick membrane. Abactinal area 

 with simple perforated embryonic plates, some of which bear a spmelet, or with 

 paxilhform plates. A central conical prominence on abaci mal surface. Actinal 

 interradial areas more or less extensive, paved with squamifonn intermediate plates, 

 covered with delicate membrane, and sometimes bearing isolated spinelets or fim- 

 briated channels. Cribriform organs present. Adambulacral plates large, with a 

 simple marginal armature, uniserially disposed. Superambulacral plates present in 

 one genus; no anus; no intestine; no intestinal cceca. Tube feet pointed; ampuU® 

 sintrli'. 



