ACTINOMETRA .lAPONICA. 2Ö3 



deep and much compressed, with small and blunt dorsal 

 spines, that on the penultimate joint not being specially 

 large. Axillaries long with sharp distal angles. 



27 -farms; the rays dividing three times. Primary and 

 secondary arms each of three joints , the axillary a syzygy. 

 First joints beyond each axillary only partly united later- 

 ally. First and second brachials both bluntly wedgeshap- 

 ed, the first being the shorter and the more oblong. The 

 next three joints short and nearly oblong; the following 

 ones both longer and wider, wedgeshaped, and overlap- 

 ping. After about the 1 5th joint the width decreases and 

 the joints become more oblong, though still overlapping. 



First syzygium on 3rd brachial; the next between the 

 10th and 14th joint; then an interval of 2— 4 joints be- 

 tween successive syzygia. 



All the lower pinnules are long, expecially the first 

 ones on the second distichals which reach about 20 mm. 

 in length. The following ones diminish gradually in length, 

 that on the 6th brachial being a good deal shorter than 

 its predecessor (on 4th br.) though still large. After this 

 the pinnules are stouter and tolerably uniform in length , 

 eventually becoming longer and more slender. 



The large lower pinnules have sharp keels on the 6 or 

 7 basal joints. After the fifth or sixth brachial this car- 

 ination is confined to the first four joints, dying away 

 altogether after about the 20th arm-joint. The lowest 

 pinnules , as far as the fifth brachials , have terminal combs. 

 Mouth interradial. Disc naked, 25 mm. in diameter. 



Spread probably between 15 and 2Ü centimetres. 



Colour light brown, the perisome being darker. 



Locality^ Japan. Coll. von Siebold. 



Remarks, This is a very well defined species, the axill- 

 aries being longer and having sharper distal angles than 

 those of any Actinomefra I have seen. The great length 

 of the lower pinnules is also remarkable. 



On this specimen, which is one of the types examin- 

 ed for Muller by Troschel I found over a dozen 3[yzo- 



Notes froin tlie Leyden IMiiseiim, Vol. III. 



