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new species, differing from the type and only other species of that 
genus hitherto known, I. angustipinna (P. H. Carp.), by its longer 
oral pinnules and by the much more widened joints of the genital 
pinnules. Neither is there any indication of the type species being 
viviparous. I shali name this new species Isometra vivipara n. sp. 
The full description of both these new Crinoids will be given 
in a Report on the Crinoids of the Swedish Antartic Expedition, 
presumably to be published in the course of this year in the 
» Wissenschaftliche Ergebnisse d. Schwedischen Siidpolar-Expedition". 
The account of the development of both species will be included 
"in the memoir, alluded to above, on the development of some 
Crinoids, to be published by the Carnegie Institution, Washington. 
18517; 
