OR LITTLE-KNOWN COMATULJE. 507 



they are ou the outer or inner arms of the riiys. The first pin- 

 nule, which is borne by the second distichal, is moderately long 

 and stout at the base, but tapers rather rapidly. The pinnules 

 on the second joints of the outer arms are both longer and stouter 

 than the distichal pinnule, sometimes very much so ; while that 

 on the fourth brachial is equal to or slightly larger than it. TJie 

 pinnules on the third and fifth joints are both smaller than their 

 fellows on the outside of the arm, and the size decreases to the 

 fourth pair, after which it gradually increases again. Ou the 

 inner arms of the rays the fourth brachial usually bears the 

 largest pinnule, those ou the second and sixth joints being about 

 equal. The distal ends of the cylindrical joints of the large lower 

 pinnules are raised into slight spines. 



Disk naked and considerably incised, 10 mm. in diameter. 



Colour purple, with whitish bands ; sacculi closely set along the 

 pinnule-ambulacra. 



Spread probably about 10 centim. 



One mutilated specimen from Canton. 



Eemarlcs. — The characters of the lower pinnules distinguish 

 this species very readily from other Antedons with primary arms 

 of three joints, the axillary with a sjzjgy, and secondary arms of 

 two joints, the axillary without a syzygy. This section of the 

 genus includes A. Savignyii of the Eed Sea, and about fifteen 

 other species, four of which are in the Hamburg Museum. 



6. Aktedok ceen'ulata, u. sp. 



Description of an Individual. — Centrodorsal a thick convex 

 disk 5 mm. in diameter, with a single or partially double row of 

 about 20 marginal cirri. These have 30 -j- joints, of which the 

 sixth is longer than broad and the following ones tolerably equal ; 

 the eleventh joint and its successors bear strong, forward pro- 

 jecting dorsal spines, which diminish again after about the 25th 

 joint. 



Eirst radials partly visible, with crenulated distal edges ; the 

 second trapezoidal, closely united laterally, and rising ratlier 

 sharply towards the middle of their junction with the pentagonal 

 axiUaries, which are about twice their length. Eays very close to 

 one another and divide twice, or sometimes three times. The 

 first division of three joints, the axillary with a syzygy ; and the 

 second of two joints, the axillary without a syzygy. The first 

 two joints beyond each axillary form a slight tubercular elevation 

 at the middle line of their junction. First brachials rhomboidal 



