No. 7. — Reports on the Results of Dredging, under the Supervision 

 0/ Alexander Agassiz, in the Caribbean Sea, in 1878, 1879, and 

 along the Atlantic Coast of the United States, during the Summer 

 0/I88O, by the U. S. Coast Survey Steamer ''Blake," Commauder 

 J. R Bartlett, U. S. K, Commanding. 



(Published by permission of Caiujle P. Patterson, Supt. U. S. Coast and 

 Geodetic Sui-vey. ) 



XI. 



Report on the Acalephce, by J. Walter Fewkes. 



HYDROIDA. 



The collection of hydroids obtained by Mr. Agassiz during the expe- 

 ditions of the "Blake " in the Caribbean Sea, in 1878, 1879, and off the 

 eastern coast of the United States, in the summer of 1880, contains the 

 genera and species mentioned in the following pages. Two genera of 

 gymnoblastic hydroids, Eudendrium and Tuhidaria, were collected. 

 The latter is T. indlvisa (?) ; the species of the former could not be de- 

 termined. The majority of the I'emaining forms belong to the family 

 of Plumidaridce. 



The following genera and species have already been described. 



Taken in the Caribbean Sea, 1878, 1879: — 



iglaophenia apocarpa, All., Milli<j;an's Key, 124 fms. 

 gracilis, All., Martini(jiie, 96 fnis. 

 ramosa, All., St. Vincent, 95 fms. 

 ramulosa, Kirch., Barbados, 94 fms. 

 Montserrat, 88 fms. 

 Barbados, 76 fms. 

 Antenella gracilis, All., Barbados, .56 fuis. 



Martiiii([iie, 96 fms. 

 Gryptolaria abies, All. , Barbados, 94 fms. 

 Grenada, l.'J4 fms. 

 Grenada, 170 fms. 

 Montserrat, 88 fms. 

 Sta. Cruz, 508 fms. 



VOL. VTIT. — NO. 7. 



