OE MTTLE-KNOWN COMATULiE. 501 



There are some specimens of Eudiocrinus in the University 

 Museum at Berlin, which were kindly shown to me by Dr. Hil- 

 gendorf, who had collected them in Japan. I think that they are 

 probably identical with the type just described. They have 

 rather fewer cirrus-joints, and the junctions of the first eight 

 brachials are distinctly tubercular. The tubercle between the 

 first pair is in the middle line, and those between the following 

 joints lie alternately on cither side of the arm. The three ' Chal- 

 lenger ' examples, liowever, show no traces of these tubercles, 

 with the exception of the median one, which is far less marked 

 than in the Berlin s]iecimens. 



II. The Cohatulje op the HAMBUEa Museum. 



"When I visited my friend Dr. H. Ludwig (now professor at 

 Griessen) at Bremen in August 1880, 1 found that the Echino- 

 derm collection of the Hamburg Museum was in his hands for 

 the purpose of description. It included several fine Comatulcs, 

 to examine which I was then on my way to Hamburg ; and Dr. 

 Ludwig most kindly offered to ask permission from the direc- 

 torate of the museum to transfer them to me for examination 

 and description. This was readily granted by Dr. H. Bolau, the 

 chief director, and by Dr. Karl Kraepclin, who has especial charge 

 of the Echinodernis, and was good enough to forward to me four 

 dry specimens that had not been sent to Dr. Ludwig. To all 

 these gentlemen, therefore, my sincere thanks are due for their 

 courteous readiness to facilitate my work. 



Apart from the ordinary European Comatulcc, tlie museum 

 contains nine species of Antedon and seven of Actinometra. 

 Eight species of the former genus and one of the latter are new 

 to science, while Act. rolusia, Liitk., though long Icnown in col- 

 lections, is here described for the first time ; and the occurrence 

 of a well-preserved spirit-specimen of Act. Solaris, MiiU., has 

 enabled mo to add somewhat to our knowledge of this important 

 type. 



The mutual relations of the various species referred to in the 

 following pages are shown in the accompanying Ivcys. 



Genus ANTEDOJf, de Frem. 

 A. Ten arms. 



a. Arm-joints compressed and keeled .... 1. carinata. Lam. 



b. Arms not keeled. Lower pinnules smooth- 



jointed and tolerably equal 2. Icevipinna, 



