THE AXNxiL 



MAGAZINE OF NATURAL HISTORY. 



[SEVE>fTII SKRIKS.] 



No. 80. AUGUST 1904. 



XIIT. — On somp. FchiDothurids from Japan and the hidtan 

 Ocean. By Dr. Til. MoRTE>JSKN, Copenhagen. 



[Plates II.-V.] 



In the autumn of 1D02 Professor F. Jeffrey Bell sent me six 

 specimens of Japanese Echinothurids, asking me to examine 

 them. I found them to belong to three different genera 

 and species, two specimens of each. One of tiiem proved 

 to be an interesting new species of Arceosoina, tiie two others 

 to be identical with the two species described by Yosfiiwara, 

 Asthenosoma iji'mai and A. longispimim^ two species as yet 

 insufficiently known, so that I had to leave it undecided in my 

 revision of the P^chinothuridai in the '■ Ingolf Echinoidea * 

 to which genus they should be referred. The collection thus 

 proved to be of considerable interest. Knowing, however, 

 that Dr. de Meijere was about to treat some closely related 

 forms in the 'Siboga^ Echinoidea, I thought it better to 

 postpone examining the little collection till de Meijere^s 

 work had appeared, and Professor Bell willingly agreed to 

 my proposition. As that eminent work has now appeared, 

 no further delay is needed. 



Meantime I have likewise received for examination four 

 epecimens of Japanese Echinothurids from the Museum of 



* The Danish Tngolf ' Expedition, iv. 1, Echinoidea, i. (1903). 

 Ann. (& Mog, N. Hist. Ser. 7. Vol. xiv. 6 



