Land and fresh water mollusks / by William H. Dall. Hydroids / C.C. Nutting.
- William Healey Dall
- Date:
- [1910]
Licence: In copyright
Credit: Land and fresh water mollusks / by William H. Dall. Hydroids / C.C. Nutting. Source: Wellcome Collection.
199/308 page 175
![BY C. C. NUTTING CONTENTS Introduction 175 Geographic distribution 176 Systematic discussion 181 INTRODUCTION. The collection of Hydroida secured by the Harriman Ex- pedition is of exceptional interest, and proves to be one of the most important and most extensive collections of these beautiful forms of marine life thus far made in Alaskan waters. Our pre- vious knowledge of the Hydroid fauna of this region rested almost exclusively on the collection made by Dr. W. H. Dali and his associates during the years 1871-1874 and reported on by Dr. S. F. Clark.1 The number of species listed in Clark’s report is 41, in which was included Coppinia arcta, now known to be merely the gonosome of Lafcea. Of these 40 species, 15 are well known British forms, and only one was then known from the Atlantic coast of the United States. The remaining 24 species were new. 1 Report on the Hydroids collected on the coast of Alaska and the Aleutian Islands by W. H. Dali, U. S. Coast Survey, and party, from 1871 to 1874, inclusive. Proc. Acad. Nat. Sciences, Philadelphia, 1876. [157] (i7S)](https://iiif.wellcomecollection.org/image/b28132890_0199.jp2/full/800%2C/0/default.jpg)
