FISHERY BULLETIN: VOL. 74, NO. 4 



genus Stephayiauge, being aware of the existing 

 anatomical differences in the development of the 

 sphincter, the retractors, and the number of perfect 

 mesenteries, siphonoglyphs, and directive mesen- 

 teries. To these differences should be added the 

 occurrence of atrichous haplonemes, not only in 

 the column ectoderm, but also in, at least, some of 

 the inner tentacles. The arrangement of the 

 mesenteries into filament-equipped perfect and 

 into imperfect ones devoid of filaments as well as 

 retractors should also be taken into consideration. 

 The morphology of this species shows so many 

 differences from other species of the genus Ste- 

 phanauge that I consider it very doubtful to place 

 the species in this genus, or, taking into conside- 

 ration the occurrence of atrichs in the studied 

 specimens, in any other hormathiid genus. 



ACKNOWLEDGMENTS 



I thank Roland L. Wigley, National Marine 

 Fisheries Service, Woods Hole, who kindly placed 

 the material at my disposal and who also supplied 

 me with station data. 



I also thank Karl-Georg Nyholm, Institute of 

 Zoology, University of Uppsala, and Tor G. 

 Karling and Roy Olerod, Swedish Museum of 

 Natural History, Stockholm, for their kind com- 

 pliance in placing laboratory facilities and desired 

 material at my disposal. My thanks are also due to 

 Bo Molin, Uppsala, for the magnificent technical 

 assistance he provided by sectioning and staining 

 some of the studied material and for redrawing 

 the figures. 



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