IV BULLETIN 201, UNITED STATES NATIONAL MUSEUM 



Class Crustacea — Continued 



Subclass Malacostraca — Continued 

 Division Peracarida — Continued 



Order Mysidacea — Continued Page 



Suborder Mysida 35 



Family Petalophthalmidae Czerniavsky 35 



Genus Petalophthalmus Willemoes-Suhm 35 



Petalophthalmus armiger Willemoes-Suhm 



(A) i 35 



Petalophthalmus oculatus Illig (A) 40 



Genus Hansenomysis Stebbing 43 



Hansenomysis fyllae (Hansen) (A) 43 



Genus Scolophthalmus Faxon 43 



Scolophthalmus lucifugus Faxon (A) 43 



Genus Ceratomysis Faxon 43 



Ceratomysis spinosa Faxon (A) 43 



Family Mysidae Dana 45 



Subfamily Boreomysinae 45 



Genus Boreomysis G. 0. Sars 45 



Boreomysis inermis (Willemoes-Suhm) (A) 46 



Boreomysis nobilis G. O. Sars (A) 47 



Boreomysis tridens G. O. Sars (A) 48 



Boreomysis arctica (Kr0yer) (A) 49 



Boreomysis sibogae Hansen 51 



Boreomysis calif ornica Ortmann (A) 52 



Boreomysis fragilis Hansen (A) 55 



Boreomysis obtusata G. O. Sars 55 



Boreomysis microps G. 0. Sars (A) 55 



Boreomysis rostrata Illig ? (A) 56 



Subfamily Siriellinae 60 



Genus Siriella Dana 60 



Siriella thompsonii (H. Milne-Edwards) 



(A) (P)» 60 



Siriella gracilis Dana (A) (P) 62 



Siriella vulgaris Hansen (P) 62 



Siriella vulgaris var. rostrata Tattersall (P)_ 63 



Siriella affinis Hansen (P) 64 



Siriella inornata Hansen (P) 65 



Siriella media Hansen (P) 65 



Siriella chierchiae Coifmann (A) 66 



Siriella pacifica Holmes (A) 70 



Siriella roosevelti Tattersall (A) 72 



Siriella panamensis Tattersall (A) 76 



Siriella aequiremis Hansen (A) (P) 78 



Siriella anomala Hansen (P) 79 



Siriella distinguenda Hansen (P) 79 



Siriella dubia Hansen (P) 79 



Genus Hemisiriella Hansen 80 



Hemisiriella parva Hansen (P) 80 



Hemisiriella abbreviata Hansen 80 



Subfamily Gastrosaccinae 80 



Genus Archaeomysis Czerniavsky 81 



Archaeomysis grebnitzkii Czerniavsky (A)_ 81 



Archaeomysis maculata (Holmes) (A) 86 



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



