CHRISTIANIA VIDKNSK.-SELSK. FORHANDL. 1888. No. 7. 11 



Fam. 3. 



I 1 ] u p li a u s i i d æ. 



liemarks: The numerous surface-gatherings, made during the 

 "Challenger" Expedition, in man}', different parts of the Ocean, and 

 now placed in my hands for examination. have yielded a rather 

 extensive material of forms, belonging to this interesting family of 

 Schizopoda. both adults and larvæ, and although the specimens. owing 

 to their being usually mingled with many other surface-animals, 

 in the same small bottle. are not always in the best state of pre- 

 servation. I have succeeded in determining man}- interesting new 

 forms, and also have been enabled to verify, and more completely 

 to settle. the distinctive characters of the species, formerly established 

 by Dana. but generally very unsatisfactorily described. and drawn, 

 by that author. Beside the genera, already established. viz : Euphau- 

 sia, Thysanopoda and Thysanoessa, 3 new genera are now proposed, 

 and the closer examination of the "Ohallenger" Euphausiidæ, also has 

 led me to establisii a fourth new genus. Borcophausia. for the re- 

 ception of the northern species formerly referred by me to the 

 genus Euphausia of Dana. I subjoin below. diagnoses of all the 

 forms collected during the "Challenger" Expedition. Full descrip- 

 tions. and drawings, will be given in my Report, together with ana- 

 tomical details. and representations of the very interesting. and 

 remarkable, postembryonal, development, characteristic of this group 

 of Schizo]i' da. 



( ten. I. Euphausia I 'ana ls.v_\ 



United States Expl. Exped. Vol. XIII. Crnstacea. 



Gencric cliaractcrs. Antennular peduncle. subcyliudrical. and of 

 the same strueture in both sexes. Flagella of both pairs of an- 

 tennæ, greatly elongated. Last joint of the 2nd pair of maxillæ. 

 large, and broad. nuter plate, small. Two anterior pairs of legs 

 (the modified maxillipeds) only slightly differing from the succee- 

 iJinsr; last joint of the 2nd pair. somewhat dilated. and compressed. 



