CONTENTS 



Page 



Introduction 1 



Systematic distribution 3 



Geographical distribution 3 



History of American Mysidacea 8 



Systematic discussion 11 



Class Crustacea 11 



Subclass Malacostraca 11 



Division Peracarida 11 



Order Mysidacea 12 



Suborder Lophogastrida 12 



Family Lophogastridae G. O. Sars 12 



Genus Chalaraspidum Willemoes-Suhm 13 



Chalaraspidum alatum (Willemoes-Suhm) 



(A)' 14 



Genus Lophogasler M. Sars 15 



Key to the species of Lophogaster 16 



Lophogaster typicus M. Sars 17 



Lophogaster hawaiensis Fage 17 



Lophogaster americanus Tattersall (A) 17 



Lophogaster japonicus Tattersall 19 



Lophogaster intermedins Hansen ? 20 



Lophogaster sp. ? 20 



Lophogaster spinosus Ortmann (A) 21 



Lophogaster longirostris Faxon (A) 21 



Genus Paralophogaster Hansen 22 



Paralophogaster glaber Hansen (P) 1 22 



Paralophogaster atlanticus Tattersall (A)__ 24 



Genus Gnathophausia Willemoes-Suhm 25 



Gnathophausia ingens (Dohrn) (A) (P) 25 



Gnathophausia gigas Willemoes-Suhm (A) _ 26 

 Gnathophausia gracilis Willemoes-Suhm 



(A) (P) . 28 



Gnathophausia longispina G. O. Sars (P)-. 28 

 Gnathophausia zoea Willemoes-Suhm (A) 



(P) 29 



Gnathophausia zoea var. scapularis Ort- 

 mann (A) 31 



Gnathophausia elegans G. O. Sars (P) 31 



Family Eucopiidae Dana 32 



Genus Eucopia Dana 32 



Eucopia sculpticauda Faxon (A) 32 



Eucopia australis Dana (A) 33 



Eucopia major Hansen (A) 33 



Eucopia unguiculata (Willemoes-Suhm) 

 (A) (P) 34 



'"A" designates American species; "P," Albatross Philippine species. 



in 



