A REVIEW OF THE MYSIDACEA 3 



SYSTEMATIC DISTRIBUTION 



The National Museum collection includes 120 species distributed 

 among the families and subfamilies of the order as follows : 



Family Lophogastridae 15 species 



Eucopiidae 3 



Petalophthalmidae 4 



Mysidae : 



Subfamily Boreomysinae 7 



Sirielliuae 14 



Gastrosaccinae 12 



Mysinae : 



Tribe Erythropini 27 



Leptomysini 8 



Mysini 27 



Heteromysini 3 



The list of American species of Mysidacea includes 118 species, of 

 which 113 are named and 5 cannot be identified or described because 

 of the defective nature of the specimens or because of the paucity of the 

 material available for study. The species are distributed among the 

 families of the group as follows : 



Family Lophogastridae 10 species 



Eucopiidae 2 



Petalophthalmidae 5 



Mysidae : 



Subfamily Boreomysinae 7 



Sirielliuae 5 



Gastrosaccinae 6 



Mysinae: 



Tribe Erythropini 29 



Leptomysini 12 



Mysini 33 



Heteromysini 4 



GEOGRAPHICAL DISTRIBUTION 



The mysidacean fauna of American waters is thoroughly repre- 

 sentative of the order as a whole, only the two subfamilies Rhopal- 

 ophthalminae and Mysidellinae, of the family Mysidae, being unrep- 

 resented. Speaking quite broadly the families Lophogastridae, Eu- 

 copiidae, and Petalophthalmidae, the subfamily Boreomysinae, and 

 the tribe Erythropini, of the subfamily Mysinae, comprise the deep- 

 water forms, while the shallow-water fauna includes the subfamilies 

 Siriellinae and Gastrosaccinae and the tribes Leptomysini, Mysini, 

 and Heteromysini, of the subfamily Mysinae. The American fauna 

 is made up of approximately half deep-water and half shallow-water 

 or littoral species. 



