AMERICAN HYDROIDS. 135 



SAKS, G. O Bidrag til Kundskaben om Norges H.vdroider. (Videnskabernes Selskabs Forhand- 



linger, 1873.) 



Describes Plumularia gracillima=Schizotrio}ia gracillima and tbe new genus 

 PolyplumuJaria. The author's investigations also increase the known distribu- 

 tion of several Plumularida-. 



SPENCER, W. BALDWIN A new family of Hydroidea, together with a description of tbe structure of a new 



species of Plumularia. (Transactions of the Royal Society, Victoria, 1890.) 



Important, as showing the intergradatiou between the Plumularidii- and 

 Hydrocorallinie. 



TKASK, JOHN B On some New Microscopic Organisms. (Proceedings of the California Academy of 



Science, March, 1857.) 



Contains original description of Plumularia franciscana. 



VARENNE, A. DE Re'cherches sur la reproduction des Polypes Hydraires. (Archives de Zoologie, Paris, 



1882.) 



Discusses tbe origin of sex-cells in Plumularia echinulata. The work is beau- 

 tifully illustrated. 



VERRILL, A. E. and SMITH, S. I. Report upon the invertebrate animals of Vineyard Sound and adjacent waters, etc. 



(Report of the U. S. Commissioner of Fish aud Fisheries, 1871-72.) 



Describes several American Plnmularid:?, Plumularia tene.lla being new. Also 

 discusses Plumularia arborea Desor under the name Aglaophenia arborea Verrill. 



VERRILL, A. E Notice of recent Additions to the Marine Fauna of the eastern coast of North America, 



No. 4. Brief Contributions to Zoology from the Museum of Yale College, No. XLI. 

 (American Journal of Science, April, 1879.) 



Contains original descriptions of Cladoearpus pourtalesii, Cladoearpus cornutm, 

 and Cladoearpus xpeciosus. 



VERRILL, A.E Preliminary check listof the Marine Invertebrata of the Atlantic Coast, etc. (Report 



of the U. S. Commissioner of Fish and Fisheries, 1879.) 



Includes all Plumularidse of our eastern coast so tar as then known. 



VERRILL, A.E Notice of recent Additions to the Marine Invertebrata of the Northeastern Coast of 



America, etc., Part 5 (Proceedings of the U. S. National Museum, VIII, 1885.) 

 Contains tbe original description of Cladoearpus fleiilis. 



WEISM ANN, AUGUST Die Entstehung der Sexualzellen bei den Hydromedusen. Jena, 1883. 



A magnificent monograph; illustrated by colored plates aud giving a com- 

 plete account of the origin of the sex-cells in several of the Plumularidu.'. 



