6 AUSTRALASIAN ANTARCTIC EXPEDITION. 
Family NovocrinipDa®. 
Notocrinus virilis Mortensen. 
OrpvEeR INADUNATA. 
Family PLIcATOCRINIDAE. 
Ptilocrinus antarcticus Bather. 
The genera Promachocrinus, Solanometra, Anthometra and Notocrinus are confined 
to this region. Hwmorphometra is represented by another species (hirsuta) at Marion 
Island. Jsometra is represented by another species off the coast of South America 
as far north as Montevideo. Ptilocrinus is repfesented by a second, much larger, species 
(brucei) in deep water (2,485 fathoms) in the Antarctic regions, and by a third (pinnatus) 
in deep water (1,588 fathoms) off British Columbia. Florometra includes numerous 
species which range northward from Cape Horn along the western coast of South and 
North America to Alaska and the Aleutian Islands, and thence southward to southern 
Japan. The genus Thaumatometra is very widely distributed in deep water, although 
it does not occur in the Arctic or in the eastern Pacific; but there is some doubt whether 
the species described as Thaumatometra nutrix really belongs to this genus. 
The genus Ptilocrinus is the only genus of stalked crinoids known from the 
Antarctic in shallow water. 
In sharp contrast to the richness of the Antarctic, the Arctic fauna is very poor 
in crinoids, including only two species. These with their ranges, are :— 
Heliometra glacialis (Leach): Arctic seas and southward to the eastern shore of 
Hudson Bay, Georges Bank, off Cape Cod, Massachusetts, Iceland, the Faeroe Islands, 
northern Norway (West and East Finmark), and eastward along the Russian coast to the 
New Siberian (Liakhof) Islands; also (var. maxima) from Cape Patience (Terpenia), 
Sakhalin Island, and the Gulf of Tartary southward along the Asiatic coast to the Korean 
Straits. 
Poliometra proliva (Sladen): Arctic regions; westward to Grinnell Land, 
southward to the vicinity of Godhaab, west Greenland, Cape Brewster, east Greenland, 
the vicinity of Jan Mayen, the cold deeps west, north and east of Iceland, the Faeroe 
Channel and Finmark, and eastward to Kara Bay and just east of Wilezek Land. 
Heliometra glacialis belongs to the Heliometrinae and is closely related to the 
various species of this sub-family occurring in the Antarctic regions and in the east 
and north Pacific. Poliometra prolixa belongs to the Zenometrinae, and is related, 
though not very closely, to Psathyrometra antarctica which is found on the borders 
of the Antarctic continent at a depth of 1,480 fathoms. 
