KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 59. N:0 4. 33 



genus as, for my own part, I doubt whether it is right to establish a new genus on 

 the basis of this character. The development of the spines is very variable, as one 

 can see from the fignres that I have given. Sometimes they already appear on the 

 most proximal segments, sometimes first in the distal part of the cirrus, sometimes 

 they are very insignificant or even absent (as in sp. 8 inner row). 1 



The question as to how far the small forms O. intermedia and marginata are 

 to be considered as real species or mere juvenile forms of the above mentioned spe- 

 cies, I shall leave undecided. 



One may, however, observe the peculiar statement that P a is absent in O. 

 intermedia. In such a little species as O. intermedia one may suspect that the absence 

 of P a is due to youth and not a mature character as it is for instance in Decametra. 



1 In Clark' s above-mentioned new work Oligomctrides is distinguished from Oligometra by the former 

 liaving P t as the largest pinnula (compare my conrirmatory rigures). 



K. Sv. Vet. Akad. Handl. Band 59. N:o i. 



