296 THE SCHIZOPODA. » 



imperfect, but some points may be mentioned. No species is a surface form to 

 any degree comparable with Siriella thompsonii M. Edw. or S. gracilis Dana 

 (comp. the statements on p. 193 and p. 194). The great majority of the species 

 were taken only in "300 fms. to surface," but the material in the Copenhagen 

 Museum proves that three such species, viz. Thysanopoda tricuspidata M. Edw., 

 T. aequalis H. J. H., and Euphausia pseudogibba Ortm. have not infrequently 

 been taken at the surface. The lists of Stations from the Agassiz Expedition 

 together with the Copenhagen material shows that Euphausia tenera H. J. H., 

 E. lameUigera H. J. H., the members of the A;ro /inii-group, viz. Euphausia 

 eximia H. J. H., E. diomedeae Ortm., E. mutica H. J. H., E. brevis H. J. H., (and 

 E. recurva H. J. H.), and Stylochciron carinatum G. 0. S., were frequently taken 

 at the surface. The Agassiz Stations show that full-grown specimens of Nema- 

 toscelis gracilis H. J. H. were never taken at the surface and generally in "300 

 fms. to surface," but that immature or generally even small specimens were 

 taken at the surface at a few Stations. With the above-named exceptions the 

 species of the genera Thysanopoda, Nematoscelis, Nematobrachion, and Sty- 

 locheiron have very rarely or never been taken at the surface. Specimens of 

 Bentheuphausia amblyops G. O. S. have been captured at seven Stations in 

 "300 fms. to surface," but all specimens with a single exception seem to be im- 

 mature, and judging from the Monaco material the adults live generally in 

 greater depths. Finally the adults of the two gigantic species Thysanopoda 

 cornuta Illig. and T. egregia probably live always in great depths, and adult 

 males of T. monacantha Ortm. are probably unknown; though Dr. Agassiz 

 secured specimens of the last-named species at eighteen Stations in "300 fms. 

 to surface" the males at hand seem to be immature. 



It may still be mentioned that specimens of two species, Euphausia dis- 

 tinguenda H. J. H. and Nematoscelis gracilis H. J. H., were found in the bottom 

 of the Tanner net from 300 fms. Of the first-named species both adult and 

 especially immature or small specimens were also taken at the surface, while of 

 N. gracilis only young specimens were taken a few times at the surface, numerous 

 adult specimens from many Stations generally in "300 fms. to surface." 



Pseudeuphausia latifrons G. O. S., which was taken at the Fiji Islands but 

 not in 1904-5, may be mentioned separately. According to our knowledge, 

 especially from the "Siboga," this species seems to hve rather near the coasts, 

 frequently in shallow water, and has, for instance, been captured at a number 

 of anchorages. 



