64 Leuckart: Bericht üb. d. Leist. in d. Natureceschichte 



Scilla Ltitk., A. neapolitana Sars^ und Ophiopholis A. Ag. 

 (mit Ampli. cordifera Lym. = A. elongata Liitk.) abge- 

 trennt. 



Die Diagnosen der neuen Gen. lassen wir hier folgen : 

 Ophio cer amus Lym. Disk covered with radial shields and 

 stout scales, none of which are surrounded by a belt of small ones. 

 Over the base of each arm a small notch in the disk. Genital sca- 

 les concealed. Teeth, Tooth-papillae. Mouth papillae. Side mouth- 

 shields small and not meeting within. Arm-spines arranged along 

 the outer edge of the side arm - plates. ISTo supplementary pieces 

 to te Upper arm-plates. Two genital slits, beginning outside the 

 mouth- shields. 



OphioZ'Ona Lym. Disk covered with radial shields and stout 

 scales, each larger one, above, being surrouded by a belt of smaller 

 ones. Over the base of each arm a small notch in the disk. Ge- 

 nital scales thick and conspicuous. Teeth. No tooth-papillae Mouth- 

 papillae. Side mouth-shields wide and nearly or quite meeting 

 with in. Arm-spines arranged along the outer edge of side arm-pla- 

 tes. No supplementary pieces to the up^Der arm-plates. Two genital 

 slits, beginning at the side's of the mouth-shields. 



ph i ophr agmus Lym. Disk small and delicate, furnished 

 with uncovered radial shields and covered with naked scales ; the 

 scales along the edge of the disk are turned up, so as to make a 

 little fence. Teeth. No tooth-papillae. Six mouth-papillae to each 

 angle of the mouth. Arms slender, even, more or less flattened. 

 Arm-spines short and regulär, arranged along the sides of the side 

 arm-plates. 



Ophiocnida Lym. Disk small and dehcate, furnished wäth 

 uncovered radial shields; its coat of naked, overlapping scales, is 

 beset with small thorns. Teeth. No tooth-papillae. Six mouth-pa- 

 pillae to each angle of the mooth. Arms slender, even, more or less 

 flattened. Arm-spines short and regulär, arranged along the sides 

 of the side arm-plates. Two genital slits to each interbrachial space. 



Hemipkolis A. Ag. Disk, above , covered with rounded, 

 rather thick scales, and wäth large radial shields ; below nacked. 

 At the base of each arm disk slightly indented. Teeth. No tooth- 

 papillae. Two mouth-papillae to each angle of the mouth. Side 

 mouth-shields touching each other, so as to from a continuous ring 

 round the mouth. Three short tapering arm-spines. Two genital 

 slits, beginning outside of the mouth-shields. 



Li Betreff des Gen. Ophiocoma Ag. hebt Verf. hervor, dass 

 Oph. bidentata und Oph. Nilssonii M. et Ti'. kein Artenrecht zu be- 



