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NEW SPECIES OF MYSIDACID CRUSTACEANS 



By WALTER M. TATTERSALL 

 Professor of Zoology, University College, Cardiff, Wales 



I am indebted to the courtesy of the United States National Museum 

 for the opportunity of examining the collections of Euphausiacea and 

 Mysidacea made by the Johnson-Smithsonian Deep-Sea Expedition 

 to the Puerto Rican Deep of 1933. 



The Euphausiacea did not include any new species or unexpected 

 forms and are not further dealt with in this paper. They belonged to 

 well-known West Atlantic tropical species. 



Among the Mysidacea I detected specimens of five new species, 

 descriptions and figures of which are ofifered below. In addition to 

 the new species, mention should be made of the following rare forms 

 also contained in the collection : 



Lophogaster longirostris Faxon. Serial numbers 117 and 542. 



Two specimens. 

 Lophogaster spinosus Ortmann. Serial number 495. 



Four specimens. 

 Petalophthalmus oculatus Illig. Serial number 573. 



Three specimens. 



Lophogaster longirostris has been recorded only once previously, by 

 Faxon (1896), from the Gulf of Mexico. L. spinosus is a rare deep- 

 water Atlantic species noted on three occasions only, by Ortmann 

 (1906), Zimmer (1914), and Tattersall (1926), all from the deep 

 water of the Atlantic Ocean. Petalophthalmus oculatus is a very re- 

 markable species so far recorded only from the Indian Ocean, Illig 

 (1930). 



Smithsonian Miscellaneous Collections, Vol. 91, No. 26 



