Crinoidea. 



439 



continent. Both, however, are closely related to East Indian genera, Co- 

 matulella to Comatula and Ptilometra to Pterometra and Asterometra, which 

 they represent in the region. 



Certain East Indian genera have, in Australian waters, produced ad- 

 ditional species, and these species are remarkable for a more or less 

 marked degree of aberrance, or of an exaggeration of their characters in 

 various ways. Thus the genus Comatula possesses three purely Australian 

 species, one with twenty arms, one with ten large and ten small arms, 

 and one, ten armed, with interradial cirri only ; the genus Comanthina 

 possesses a species with an extraordinary carination of the pinnule seg- 

 ments and a heavy dorsal perisomic plating; the genus Zygometra possesses 

 three species, all with very numerous arms and long and stout cirri; the 

 genus Diclirometra possesses two species ; and the genus Oligometra three, 

 all of the latter departing widely from the generic mean in various ways. 



Of the species twenty-four are purely East Indian forms which range 

 southward along the tropical Australian coasts for varying distances, some 

 reaching as far as Sydney (or Port Jackson) on the east, and Fremantle 

 on the west. These species are the following. 



List of the East Indian Crinoids occurring on the coasts 



of Australia. 



[The first column gives the southern limit of the range on the west coast, 

 the second column, to the right, the southern limit of the range on the 



east coast.] 



Comasteridae. 



Capillasterinae. 

 Comatella stelligera ? 



Comatella maciilata ? 



Capillaster multiradiata Dirk Hartog I. 



Port Jackson 

 Bowen 

 Flinders I. 



Comatula Solaris 

 Comatula pectinata 



Comactiniinae. 



Holothuria Bank Port Curtis 



Baudin I. 



Comasterinae. 

 Port Hedland 



Comaster typica 

 Comantheria alternans ? 



Comantheria briareus ? Perth 

 Comanthina schlegelii ? 



Comanthus bennetti ? 



Comanthus annulata ? Perth 



Comanthus parvicirra Fremantle 



Port Jackson 



Percy I. 

 Port Molle 

 Port Denison 

 Percy I. 

 Port Denison 

 Bowen 

 Moreton Bay 



