1864.] SENATE— No. 22. 31 



The large collection from the Amazon and Rio Negro, Brazil, 

 made by the Rev. Mr. Fletcher and friends whom he interested 

 in our labors, while in Brazil. This collection was very rich in 

 interesting and hitherto unknown species. For the special 

 localities and number of specimens, I would refer to the list of 

 additions annexed. 



The collection from the Amour River, secured to the Museum 

 by the kind interest of H. A. Peirce, Esq. 



The collection from Kanagawa, Japan, made by Mr. 

 Gulich. Among other valuable specimens contained in this 

 collection, are those of the genus Ditrema Tern, et Schl., 

 affording me the opportunity of personal examination of this 

 genus, which, from the figure given in the " Fauna Japonica," 

 I thought might prove to be congeneric with Tceniotoca A. Ag. 

 The comparison of these specimens with the different genera of 

 the family of Holconoti, convinces me that Ditrema is a distinct 

 genus from all others in the family, though closely allied to 

 Tceniotoca and Hyperprosopon. I therefore take this means to 

 correct the mistake made in the "Museum Bulletin." 



The large collection from the east coast of Africa, made by 

 Mr. Cooke, is rich in species new to the Museum. 



The collections from China, made by Messrs. Hurd and 

 Chamberlin. 



The European collections received from Don Juan de 

 Elizalde, Capt. De Broca, Capt. A. Vouga and Dr. Kaup, 

 Messrs. Lyman and Stimpson, and the Free Public Museum of 

 Liverpool. 



The collection of authentic specimens from Professor Poey, 

 of Cuban species, and that from the Smithsonian Institute, of 

 a few species from California, described by Mr. Gill. 



The small but valuable collection from the coast of Chili, 

 made by Capt. Putnam. 



The collection received in exchange, from Mr. Salmin. 



The collection made by myself, at Lake Champlain. 



Perhaps the most valuable single specimen received during 

 the year is the Branchiostoma found by Mr. Bickmore in the 

 sand on Bird Shoal off Beaufort, N. C. With the exception of 

 a single specimen in the collection of the- Smithsonian Insti- 

 tution, from near the same locality, this is the only specimen of 

 the genus ever found on our coast. 



