17S THE SCIIIZOPODA. 



smaller seas between the innumerable islands in the Indian Archipelago, the 

 Agassiz Expedition of 1904-1905 had the great majority of its Stations in the 

 open ocean and far from any coast. 



On the Mysidacea at hand some remarks may be added. The eight species 

 not captured in 1904-1905 are small, pelagic forms taken near, or at most only 

 some miles from the coast; four among them are new, and one of these differs 

 so much from earlier known forms that it was necessary to establish a new genus 

 for its reception. Of the fifteen species taken in 1904-1905 four are new; three 

 of these belong to well-known genera, while a new genus is established for the 

 fourth. But by far the most important gain was the capture of Chalaraspis 

 olaia (Will.-Suhm, MS.) G. O. Sars. This genus as defined by Sars with its 

 single species has been described by him from a couple of sketches drawn by 

 Willemoes-Suhm during the "Challenger" Expedition, as the single specimen 

 had been lost. The genus belongs to the interesting suborder Lophogastrida, 

 comprising in all only six genera; the Agassiz Expedition secured some speci- 

 mens of Chalaraspis, and among them an adult male, thus rendering it possible 

 to give a detailed account of this hitherto rather enigmatic type. 



The material of Euphausiacea is, as already stated, very rich, and besides 

 it is important in various respects. Among its forty species six could not be 

 referred to earlier established forms, but in a paper published in May, 1911, 

 I have given preliminary descriptions of these, and other, new species. Perhaps 

 one might expect that the number of undescribed species had been considerably 

 higher, but in the years 1905-1910 I had established a comparatively large 

 number of species of this order on animals from the Atlantic or the Indian 

 Archipelago; the major part of the species of the order have a very large or 

 frequently even vast distribution, and consequently more than three fourths 

 of the Euphausiacea from the East Pacific were known before from the Indian 

 Archipelago ("Siboga") or from the Atlantic, or from both Oceans. But the 

 collection made it possible to extend our knowledge of the distribution of the 

 major part of the species very much; furthermore, as the material, of nearly 

 all the new species, and besides of several earlier established but hitherto imper- 

 fectly known species, is rich and generally well preserved, it was possible to give 

 a full account of these forms. And without entering into other points eluci- 

 dated by the collection, for instance, the distribution of many of the species 

 within the area explored, geographical variation of some forms, etc., another 



' II. J. Hansen: The Ornera and Species of the Order Euphausiacea, with Account of remarkable 

 Variation. Hull. Mus. OcCan. Monaco, No. 210. 



