DESCRIPTrON OF A NEW SPECIES OP COMATULA. 115 



Figs. 4-8. Transverse sections through the tails at positions marked with cor- 

 I'esponding numbers on fig. 2. Green represents the spinal cord and 

 nerves ; red, blood vessels ; black, the marrow-mass of vertebra ; grey, 

 skeletal parts and muscles. 



rig. 9. Highly magnified view of the cartilaginous cylinder and its contents in the 

 regenerated main tail. From the sarnie section as fig. 8. 



Fig. 10. Highly magnified view of a portion of the axial areolar tissue space, con- 

 taining nerves and pigment cells, of the accessory tail. From the same 

 section as fig. 7. 



Description of a new species of Comatula. 



ANTEDON MACEODISCUS, n. sp. 



By 

 Jiuta Hara. 



Along the coast line near Misaki, there are found two very com- 

 mon species of Comatula, of which one may be identified with Actino- 

 metra japonica, MiilL, while the- other seems to me to represent a new 

 species, belonging to the Milberti group of Antedon. For the latter I 

 propose the following name : — 



ANTEDON MACEODISCUS, n. sp. 



Specific formula : — A 



h 



Description of individuals. — Centro-dorsal a thick, slightly concave 

 disc bearing about forty-six cirri on its side, arranged in about three 

 rows. These have thirty-three tolerably uniform joints ; all wider than 

 long, especially so with those at the base. The middle and outer joints 

 slightly laterally compressed. Edges smooth. 



First radials scarcely visible, the second quadrate, convex, with a 

 median tubercle at the junction with the axillaries. The axillaries, 

 widely triangular (or broadly pentagonal with very short sides, adjacent 

 to the base), twice longer than the second radials. 



Ten arms, each with about one hundred fifty or more joints ; a 

 tubercle at the junction of the first and the second, and of the second 

 and the third. The third and next following brachials smooth, rounded 

 and oblong ; lower joints with alternating tubercular elevations at their 



