NOTICE. 



The following account of the Cklarida? of the Hawaiian Echini collected 

 in the spring of 1902 by the United States Fish Commission Steamer " Alba- 

 tross," Commander Chauncey Thomas, U. S. N., commanding, is the first part 

 of the description of a large collection of Sea-urchins intrusted to us for 

 examination by the Hon. George M. Bowers, United States Fish Commis- 

 sioner. A few other Echini collected by the '• xllbatross" in different parts 

 of the Pacific have been incorporated in our Report, and special reference 

 has been made to some Deep Sea Panamic Cidarida3 collected by the 

 "Albatross" in 1891, for the sake of having a connected account of the 

 pedicellarice of the Pacific Cidaridaj. This part of the Report has been pre- 

 pared by Mr. Clark, and he has, as far as practicable, analyzed the statements 

 of Mortensen, Ddderlein, and de Meijere regarding their systematic value. 

 Ml". Agassiz has in his Panamic Deep Sea Echini given his views of the new 

 classification of Echinoids proposed by Mortensen and de Meijere. As regards 

 the position taken by Doderlein regarding Mortensen's system, in his Echini 

 of the " Valdivia," which has recently been published, it is difficult to follow 

 him. His statements are often most guarded ; next they may bo enthusiastic 

 in favor of a classification based upon pedicellaria\ and again are radically 

 opposed to such a course. The numerous illustrations of pedicellarife given 

 by Doderlein are unfortunately somewhat indistinct, and it is often very 

 difficult to distinguish their characteristic features. 



The succeeding parts of this monograph on the Hawaiian Echini will be 

 published as rapidly as tlie preparation of the plates will allow. In the 

 meantime a preliminary list of the species included in tlie collection will 

 shortly be printed. For the positions indicated in the Stations, see U. S. 

 Hydrograpliic Chart, No. 1368. 



ALEXANDER AGASSIZ. 



HUBEIIT LYMAN CLARK. 



Museum of Comparative Zoology. 



Cambridge, Mass., February, 1907. 



