Bulletin du Musée Océanographique de Monaco 



N° 42. — 20 Juillet 1905 



Further Notes on the Schizopoda. 



By Dr. H. J. HANSEN (Kj0benhavn) 



In N° 3o of this Bulletin the présent author published a 

 « Preliminary Report on the Schizopoda collected by H. S. H. 

 Prince Albert of Monaco during the cruise of the Princesse- 

 Alice in the year 1904 ». While looking over the proof I recei- 

 ved additional material still larger than that already determined; 

 it had been collected the same year and the major part of it in 

 the same stations. In April I began to détermine this new col- 

 lection without any intention to write a second note. But while 

 attempting to refer half-grown or still younger spécimens of 

 Euphausia to their adult forms I discovered grave things as to 

 Euphausia pellucida, Dana, G. O. S., which has been consi- 

 dered by Sars « to be by far the commonest of ail the Chal- 

 lenger species » ; in his splendid main work, the Challenger 

 Report, he refers ail spécimens possessing two pairs of latéral 

 denticles on the carapace to this species. Ail authors have follo- 

 wed Sars as to this matter; only Ortmann has established — 

 on two spécimens taken near the Galopagos Islands — an allied 

 species, E. diomedeœ, which, according to his own statement, 



«perhaps might be better regarded as a variety of E. pellu- 



ciday). Having discovered that the Monaco material from 1904 

 contains numerous spécimens of two species with two pairs of 

 latéral denticles, and that none of thèse species is identical with 

 E. pellucida, Dana, as represented by Sars in the work men- 

 tioned, I felt that a new investigation of this question was 

 absolutely necessary and that besides several other topics ought 



