562 Leuckart: Bericht üb. d. wissenschaftlichen Leistungen 



Ophiocamax Lym. Disk besetwith thorny spines or stumps, 

 and covered by scales or irregulär plates and large radial shields. 

 Besides teeth there are tooth-papillae and mouth-papillae, numerous, 

 and all of the same spine-shape; they are arranged in tufts on the 

 mouth-frames and jaw-plate. The spiniform scales of the mouth- 

 tentacles are borne on the edge of a little supplementary plate in 

 a way similar" to Ophioglypha. Numerous thorny arrn-spines, arran- 

 ged along the sides of the side arm-plates, which are prominent 

 and meet nearly or quite above and below. In each interbrachial 

 Space two genital openings, which begin close outside the mouth- 

 tentacle. (Unterscheidet sich von den verwandten Geschlechtern be- 

 sonders durch die büschelweise zusammengruppirten Mund- und 

 Zahnpapillen und die von einer eignen Platte getragenen Mund- 

 tentakelschuppen.) 



Ophiolebes Lym. Disk and arms stout and covered by a thin 

 skin, which bears grains or stumps and hides more or less the uuder- 

 lying plates. Arm-spines short, blunt, thorny, covered by thick skin 

 and arranged on the sides of the side arm-plates, which project but 

 slightly. Long stout mouth-papillae and teeth, no tooth-papillae. 

 Yaw-covers large and wide, making a circle by their connecting 

 ends. Arm-plates rather small, but normal, nearly as in Ophia- 

 cantha. Two genital openings in each interbrachial space. (Ent- 

 hält ausser den vom Verf. neu beschriebenen zwei Arten auch 

 Ophiactis clavigera Ljungm.) 



Ophiosciasma Lym. Disk covered with thick soft spin finely 

 grannlated. Arms very slender, with lower and side plates imper- 

 fectly calcified, and no upper plates. Mouth-papillae and teeth re- 

 presented by a bunch of spines or thorns, at apex of yaw. Arm- 

 spines arranged on sides of side arm-plates. Two large genital 

 openings in each interbrachial spaco. (Ein eigenthümliches Genus, 

 das sich von dem sonst nicht unähnlichen Ophioscolex durch die 

 Granulationen seiner Scheibe und die langen knotigen Arme unter- 

 scheidet.) 



Ophiogeron Lym. Disk covered by a nacked skin. Mouth- 

 angles nacked, except a few sraall teeth on jaw-plate. Under arra- 

 platcs small and with a large tentacle-pore on either side. Side 

 arm-plates somcwhat flaring and carrying thorny arm-spines covered 

 with skin. No upper arm-plates. (Mit Ophiomyxa und Ophioscolex 

 vorwandt.) 



Astroceras Lym. Disk and arms covered with smooth, soft 

 skin. Disk small; its interbrachial outlines rc-enteringly curved; 

 radial shields narrow and rather high, running nearly to centre. 

 Arms somewhat knotted ])y a contraction between each pair of 

 jointa, Upper arm-platns divided in halves like high ribs, bearing 



