OE LITTLE-K^"0"^N COMATULJE. 495 



absent iu the two remainiug species, which I have never found 

 to be the case iu Antedon, though I have examined over one 

 hundred species of this genus. 



Genus Eudiocrinus. 



I. First two brachials united by syzygy. First 



pinnule on the second brachial , . . . . 1. iudimsus, Semper. 



II. First two brachials united by a hgamentous 



articulation. 



1 . First pinnule on second brachial 2. varians, n. sp. 



2. First pinnule on fourth brachial. 



(i) Disk plated. First brachials nearly 



oblong 3. Semperi, n. sp. 



(ii) Disk naked. First brachials trape- 

 zoidal 4. japonicus, n. sp. 



1. EuDiocBiNUS rN-DiTisus, Semper, sp. 



Ophiocrinus indivisus, Semper, Wiegm. Archiv, Jahrg. xxxiv. p. 68. 



Description of an Individual. — Centrodorsal small, convex, and 

 bearing about twenty cirri in two marginal rows, the dorsal pole 

 being free from them. Cirri 9 mm. long, of about twenty joints ; 

 the third square, or a trifle longer than wide ; the fifth is the 

 longest, and the following ones nearly all longer than wide, and 

 overlapping on the dorsal side ; penultimate with an opposing 

 spine. 



Eadials partially visible, and about one third the length of the 

 compound joint formed by the syzygial union of the first two 

 brachials, the second of which bears a pinnule on the left side. 

 Third brachial short, oblong, and bears no pinnule. The next 

 four or five joints nearly oblong, slightly shorter on one side 

 than on the other, which is not so long as the breadth and bears 

 a pinnule. The tenth and following joints have more markedly 

 unequal sides, the longer of which is longer than the breadth. 

 About 120 arm-joints, the middle ones nearly square, and the ter- 

 minal joints elongated. 



Second syzygy on the fifth brachial, the next on the ninth, and 

 the next on the thirteenth (once on the twelfth) brachial ; after 

 this an interval of two joints between successive syzygia. 



Eirst pinnule (on second brachial) quite small, consisting of 

 about a dozen short joints, the basal ones of which are rather 

 ' broad. Second pinnule (on fourth brachial) somewhat longer 

 and stouter ; the third and fourth very much so, with longer and 

 more massive joints. The next three or four pinnules on either 

 side gradually decrease in size ; and the following ones increase 

 LINK". JOrEN. — ZOOIOGT, VOL. XYT. 37 



