MONOGRAPH OF JAPANESE OPHIUROIDEA. 



347 



TuRNEEETSCHER, DÖDERLEIN and Kœhler. Typical specimens of the 

 schœnleinii-type have very short and exceedingly stout arm spines 

 and only one tentacle scale to each pore, except in a few basal 

 arm joints witliin the disk. But there are also many specimens 

 of the ermaceus-ty-pe with only one tentacle scale, instead of two, 

 to each pore in most of the arm joints. Now, there are two 

 classes of specimens which are intermediate between the erinaceitS' 

 and schœnleinii-iypQ. In the first, the arm spines are very short 

 and stout, and there is mostly only one tentacle scale to each 

 pore, though often two are present in some of the free arm 

 joints. In the second, the arm spines are not very short and 

 stout, and there is only one tentacle scale, except in a few basal 

 arm joints within the disk. There are also some specimens which 

 are intermediate between the scolopendrina- and schœnleinii-ijpe, 

 in which the arm spines are very short and stout, and not 

 uniformly blackish, as in the schœnleinii- and erinaceus'typc:, but 

 annulated or spotted with white as in the scolopendrina-ij^Q, while 

 of the tentacle scale there is mostly only one, though two may 

 be present in some of the arm joints. The numbers of the 

 specimens of each type and of the intermediate ones, together 

 with the localities, are shown in the following table : 



