KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. NIO 7. 25 



strict classification of the genera in the Euclymenini had been followed as far as 

 possible. 



The Clymene lophoseta Orlandi (19, p. 268) has been supposed by me (24, p. 

 177) possibly to belong to the genus Praxillella. Being now convinced that the fine 

 threads which, according to Orlandi (ef. his fig. 15 in Plate V), should be characteristic 

 of a large number of capillary setae, cannot be anything else but algal threads (ef. 29, 

 p. 429), I find everything supporting the idea that Cl. lophoseta is a Praxillella. Or- 

 landi mentions 17 setigerous and 3 achaetous posterior segments, whereby the species 

 seems to be well separated from other hitherto known Praxillella-s])ecies. 



Praxillella gracilis (M. Särs) var. borealis Nolte. 



(Pl. 1, figs. 20—21.) 

 1912. Praxillella gracilis var. borealis Nolte (30, p. 38). 



Nolte's diagnosis of this new variety consists chiefly of extracts from the diagnosis 

 given by me for the main species. After excluding the characters common to both, the 



Text-fig. 9. Praxillella gracilis var. borealis. — Part in Text-fig. 10. Praxillella gracilis var. borealis. — Part of 



front of the mouth. Ocelli. Drawn in outline. 40: 1. the anterior portion of the head. Ocelli. Dravvn in 



Firth of Clyde. outline. The point of the cephalic lobe not included. 



29: 1. Trieste. 



following would remain: »Die Kopfsäume in der Riickenlinie mit starkem Einschnitt. 

 (Der Analcirrus bedeutend verlängert? ) Die Parapodiensipfel der Haarborsten in der 

 Mitte des Körper bedeutend.» 



The last character is not discussed by Nolte and I am exceedingly doubtful if 

 there is any essential difference, or even any difference at all, in this respect between 

 the two forms. The statement as to the length of the anal cirrus is taken by Nolte, 

 as he quite correctly informs us, from my account of certain individuals from the Me- 

 diterranean (24, p. 191). Thus all that is left is the statement as to the cephalic borders, 

 i. e. on the whole really a very scanty diagnosis, to which Nolte adds, however, in 

 parenthesis, still supported by my Mediterranean material, 18 setigerous segments. In 

 this connection it may be noted that Mc Intosh (31, p. 324) combines the main species 

 and Nolte' s var. borealis, and also gives 19 setigerous segments for the species. 



On being asked on which material this latter statement was based, Prof. Mc In- 

 tosh kindly sent me two pieces of P. gracilis from the Gulf of St. Lawrence, Canada: 

 an anterior part up to and including the 15 th setigerous segment, and a posterior part, 

 comprising 5 setigerous segments. If these two parts really were to be put together, 

 this would make 20 setigerous segments. But there was no indication of this, rather 



K. Sv. Vet. Akad. Handl. Band 63. N:o 7. 4 



