560 Lcuckart: Bericht üb. d. wissenschaftlichen Leistungen 



bilclung der Arme, besonders deren Seitenschildern, die 

 immer mehr nach unten herabrücken, in der Bildung der 

 Haken und der geringen Entwicklung der Mundschilder. 

 Zur nähern Charakteristik der neuen Genus lassen wir die 

 vom Verf. entworfenen Diagnosen folgen. 



Ophiomastus Lyra, Disk arched and extremely high, covcred 

 with a few large thik plates, among which the piimaries are con- 

 spicuous for superior size. Arms short, with large thik side arm- 

 plates. First under arm-plate similar to and nearly as large as those 

 beyond. Mouth-papillae arranged in a narrow close-set line; teeth 

 rather slender; no tooth-papillae. Sraall smooth arm-spines arranged 

 along oiiter edge of side arm-plates. Two narrow genital openings 

 in each interbrachial space. 



Opliioplinthus Lym. Disk smooth and covered by a thin skin 

 bearing irregulär delicate scales and radial shields. Genital scales 

 wide and divided in several pieces. Small, blunt, close-set mouth- 

 papillae; no tooth-papillae; short angular teeth; very minute, peg- 

 like arm-spines on outer edges of side arm-plates. Second pair of 

 mouth-tentacles and first two pairs of arm-tentacles rising from 

 round pores near the inner end of the under arm-plates; those 

 beyond are smaller and stand close to the under arm-spine. Arms 

 narrow, cylindrical and gradually tapering. Two genital openings, 

 running only a part of the way toward the margin. Mouth-frames 

 Seen from above, after removing the top of the disk, long and rising 

 in a ridge, so that in the interbrachiale space is a wide angle, and 

 in the brachial space a deep trough. Arm-bones long and cylindri- 

 cal, with only a faint upper furrow. Genital scales long, slender 

 and cylindrical. (Repräsentirt trotz einzelner Annäherungen au 

 Ophioglypha und Ophiomusium eine besondere Form.) 



Ophiopyrgus Lym. Disk high and dome-shaped, covered 

 with thik swollen plates, and surmounted by a central primary plate, 

 which rises like a cone. Arms slender, smooth and tubulär, with 

 side arm-plates very large, and upper and under arm-plates small. 

 Basal tentacle-pores very large; those beyond sraall and situated 

 near sides of arm. An arm-comb. Arm-spines minute and standiug 

 on outer edge of side arm-plate. Two long genital openings in each 

 interbrachial space. (Ein höchst seltsamer Schlangenstern, der durch 

 die Bildung seiner Scheibe auf den ersten Blick einem stiellosen 

 Crinoiden gleicht.) 



OphiernusLym. Central portion of disk inside radial shields 

 covered by a thik skin; round the margin a broad band of scaling, 

 interrupted only by radial shields, and covering also the lower inter- 

 braohial space, the whole more or less hidden by the skin. Radial 

 shields nacked. Teeth and small numerous close-set mouth-papillae. 



