THE ANNALS 



MAGAZINE OF NATURAL HISTOKY. 



[FIFTH SERIES.] 

 No. 12. DECEMBER 1878. 



XLVIII. — New Hydroida from Ochotsk^ Kamtschatka, and 

 other Parts of the North Pacific Ocean. By C. Mere- 

 SCHKOWSKY. 



[Plates XVI. & XVII.] 



There exists a very fine collection of Hydroids from the 

 northern parts of the Pacific Ocean — from Kamtschatka, the 

 sea of Ochotsk, the Aleutian Islands, and our former posses- 

 sions in North America. This collection, which belongs to 

 the Academy of Sciences of St. Petersburg, has been brought 

 together at different times and by different persons, but espe- 

 cially by Middendorff and Wosnessensky. It is in the form 

 of a herbarium, all the specimens being dried ; but in other 

 respects its condition is very good, although, certainly, deli- 

 cate species, such as the Carapanulariidse and all the Athecata, 

 can no longer be investigated. 



Dr. A. Brandt, conservator of the Zoological IVluseum of 

 the Academy, has had the kindness, for which I have to 

 thank him, to lend me this collection for examination ; and in 

 this article it is my intention to describe some new species 

 which I have met with in it, and which are not without 

 interest*. I shall commence with the genus which I not 

 long since named Polyserias. 



* Short diagnoses of all these species have already been published in 

 Russian in the Transactions of the Society of Naturalists of St. Peters- 

 burg, vol. ix. 



Ann, & Mag. N Hist. Ser. 5. Vol. ii. 29 



