MONOGRAPH OF THE EXISTING CEINOIDS. 53 



Prof. Georg Pfeffer in 1900 published a list of the comatulids which had been 

 obtained at Ternate by Prof. W. Kiikenthal, and Prof. Percival do lAjriol described 

 Antedon doderleini {DicJirometra doderleini) from Japan. 



It was in 1900 also that Prof. Carl Chun brought out his interestmg semi- 

 popular account of the cruise of the German steamer Valdivia, in which he figures 

 a new species of Eudiocrinus (Pentametrocrinus) which was dredged off the coast 

 of Somaliland, thus extending the known range of the genus in the Indian Ocean 

 from the eastern portion of the Bay of Bengal, whence a specimen had been recorded, 

 without a specific name, by Wood-Mason and Alcock in 1891. 



The only paper of general interest in 1901 was Prof. Hubert Lyman Clark's 

 memoir on the echinoderms which had been collected by the Bureau of Fisheries 

 steamer Fish HawTc about the shores of Porto Rico. In this paper he mentions 

 the following species : 



Antedon hagenii Coccometra nigrolineata. 



Actinometra meridionalis Comactinia echinoplera. 



Actinormetra rubiginosa Comactinia echinoplera. 



In the year 1904 Mr. Frank Springer described Actinometra iowensis (Nemaster 

 iowensis) which had been obtained in three feet of water on the Florida reefs; and 

 for the first time described covering plates, comparable to those seen in many of 

 the endocycUc forms, in a comasterid. In the same year Professor Bell pubhshed 

 a hst of the comatuHds which had been collected by Mr. J. Stanley Gardiner in the 

 Maldive and Laccadive archipelagoes, noting the following: 



{Amphimetra producta. 

 Amphimctra molleri. 

 Decamelra taprohanes. 

 (Decametra mobiusi. 

 Amphinutra producta. 

 Amphimetra molleri. 



Antedon palmata Himerometra sol. 



Antedon indica Comaster gracilis. 



Antedon variipinna ? 



Actinometra typica Comanthina schlegelii. 



Actinometra fimbriata Capillaster multiradiata. 



Actinometra multiradiata Capillaster multiradiata. 



Actinometra sentosa Capillaster sentosa. 



Actinometra maculata Stephanometra indica. 



In a paper on the echinoderms of East Greenland, pubhshed in 1904, Dr. 

 Theodor Mortensen calls attention to the presence of covering plates along the 

 ambulacra of Antedon eschrichtii {Heliometra glacialis), and suggests that valid 

 systematic characters may be found in the structure of the outer pinnules of the 

 comatulid arms, wliich have hitherto been quite neglected from a systematic stand- 

 point. In the same year Mr. Herbert Chfton Chadwick publislied a Hst of the 

 comatulids which had been collected by Prof. W. A. Herdman at Ceylon during 

 his investigations of the pearl oj'ster fisheries about that island. The species 

 recorded by Chadwick are : 



Antedon serripinna Oligomctra serripinna, 



Antedon milberti Amphimetra milberti. 



