EXPEDITION TO POINT BARROW, ALASKA. 165 



temperature is concerned. Considering, as Haeckel does, that "Campanclla" is a species otJUginu, 

 his remarks on its limitations in distribution do not hold, for the distribution as known when 

 " Das System der Medusen" was written. The only locality where "Campanella n has been taken is 

 Nahant, Mass., \vliieh certainly is washed by cold waters and belongs to the colder zone. It is ;t 

 significant fact that "CampancUa " has never been taken in the bays south of Cape Cod, where the 

 water is much warmer. The medusae of Massachusetts Bay are those characteristic of colder 

 waters, while those of Narragansett Bay, which is south of Cape Cod, belong to the warmer /one 

 of the North Atlantic. "Campanella" is fonnd in the colder waters, and systematic lishiug for a 

 number of years in the latter locality has never brought it to light. 

 Locality. Capo Smythe, Alaska. 



Aglantha camtschatica HAKCK. 



The figures add a little to our knowledge of this species. Alexander Agassiz, in his descrip- 

 tion (North American Acalephre) of the same from Galiano Island, Gulf of Georgia, says there are 

 from 40 to 48 tentacles. Mr. Murdoch's notes record " 96 tentacles." The " three-lobed mauubrium," 

 mentioned in the same notes, must have been observed in an abnormal specimen (normally there 

 are never less than four lobes). 



TIME OF YEAU WHEN JELLY-FISHES MENTIONED IN THE LIST ABOVE WEKE TAKEN. 



B. roseola, March 7, July 18. 

 M. ovum, August 2. 



P. rliododactyla, July 18 (in all stages of growth). 

 A. laliata, August and September. 



C. Postelsii, August to September 15, January 7, February 6. 

 Ch. melanastcr, August 11 to October 13. 



A. citrea, February 27 to May 31. 



Ag. Camtschatica, July 18. 



Gemmnria, August 2. 



Mclicertum, May 24. 



8. rosuria, March 9, April 26. 



St. Mcrtensii, August and September. 



Turris- like Medusa, March 13. 



HYDROZOA. 

 H YDEOID A ( Tropliowmes). 



The Hydroid Medusae observed by the expedition have been described above by Mr. Fewkes. 

 The following species of Ilyilrokls are represented in the collection by their trophosomes. 



1. SERTULARIA VARIABILIS S. F. Clark. 



Tear. 



1870 



Xaroc. 



S. ]'. Chirk. 



S<-iljlic r.esults of the Exploration of Alaska, i. p. 17. pi. viii. 

 :(M8. pi. ix, ligs. 40, 5U. 



One large cluster and some fragments were dredged on a pebbly bottom in 5 fathoms near the 

 head of Norton Sound. 



Clark has described the species from various points on the coast of Alaska, both from among 

 the Aleutian Islands and from Bering Sea. 



