The material of Anthomedusae and Leptomedusae 

 brought home by the North Atlantic Deep-Sea Expedition 

 1910 is small, but it contains some very interesting species 

 and increases our knowledge of the geographical distri- 

 bution of certain species to a considerable degree. Some 

 of the Antho medusae, preferably the Tiarldae, have been 

 examined and identified by Cl. Hartlaub, Helgoland, 

 before they were sent to me in Copenhagen, and the 

 Tiaridae have been included in his paper: Tiaridae, Nor- 

 disches Plankton XII, I Teil, 3. Lief. 1914. 



The material contains 12 species. One species, Tia. 

 ranna affinis, is new to science and has been described 

 by Hartlaub in the paper mentioned above. The fol- 

 lowing species were found: 



Anthotnedusae. 



1. Sarsia princeps Haeckel. 



2. Oceania armata Kolliker. 



3. Tiaranna affinis Hartlaub nov. sp. 



4. rotunda (Quoy et Gaimard). 



5. Leuckartiara octona (Fleming). 



6. Neoturris pileata (Forskal). 



7. Pandaea conica (Quoy et Gaimard). 



Leptomedusae. 



8. Chromatonema rubrutn Fewkes. 



9. Laodicea undulata (Forbes and Goodsir). 



10. Obelia sargassi (Broch). 



11. Tiaropsis multicirrata (M. Sars). 



12. Halopsis ocellata A. Agassiz. 



West of the submarine ridge running from Iceland 

 over the Azores and further southwards, dividing the 

 Atlantic into an eastern and a western part, only four 

 species were found. The arctic species Sarsia princeps 



List of Stations 



where Anthomedusae or Leptomedusae have been found. 



Number of 

 Station 



Date 



Lat. 



N. 



Long. 

 W. 



Depth in 



meters 



Species found 



19 



May 2—3 



36° 05' 



4° 42' 





Tiaranna rotunda, Pandaea conica 





53 



June 8—9 



34° 59' 



33° or 



2615—2865 



Oceania armata 





69 



29 



41° 39' 



51° 04' 





Obelia sargassi 





70 



30 



42° 59' 



51° 15' 



1100 



Chromatonema rubrum 







July 5 



St. Johns 





Tiaropsis multicirrata 





80 



11 



47° 34' 



43° 11' 



2000 



Sarsia princeps, Chromatonema rubrum 





81 



12 



48° 02' 



39° 55' 





Chromatonema rubrum 





82 



13 



48° 24' 



36° 53' 





Chromatonema rubrum _ 





84 



15 



48° 04' 



32° 25' 





Chromatonema rubrum 





90 



21 



46° 58' 



19° 06' 





Tiaranna affinis 





92 



- 23—24 



48° 29' 



13° 55' 





Tiaranna affinis 





94 



26 



50° 13' 



11° 23' 



1565 



Halopsis ocellata 





97 



August 4 



56° 15' 



8° 28' 



139 



Halopsis ocellata 





98 



5 



56° 33' 



9° 30' 



1000—1360 



Leuckartiara octona, Halopsis ocellata 





99 



6 



57° 45' 



13° 40' 



149 



Leuckartiara octona, Laodicea undulata 





101 



6—7 



57° 41' 



11° 48' 



1853 



Leuckartiara octona, Neoturris pileata, Halopsis 



ocellata 



