OrillOCNIDA. 



133 



disk ; from 0. marghmta, in the irro<i;iilar arrangement of the disk-scales, 

 the different nroportions of the arm-phites, &c. 



LIST OF SPECIMENS, 



OPHIOCNIDA* Lyman. 



Disk small and delicate, furnished with uncovered radial shields ; its 

 coat of naked, overlapping scales, is beset with small thorns. Teeth. 

 No tooth-pnpilltB. Six mouth-papilla) to each angle of the mouth. 

 Arms slender, even, more or less flattened. Ann-spines short and 

 regular, arranged along the sides of the side arm-plates. Two genital 

 slits to each interbrachial space. 



SPECIES HEREIN DESCRIBED. 



0. hispida. 0. scabrluscula. 0. neapolitana. 



Ophiocnida hispida Lyman. 



OpMohpis hhpirln LeCoxte. Proceed. Phil. Acad., V. p. 318. 18.51. 

 Amphiitra (Ophiolepix) hispida Lutkkx. Addit. ad Hist. Oph., p. 119. 



Special Marks. — Disk gray (in alcohol); arms straw-color, figured 

 with black. Arms to disk as about ten to one. Under arm-plates 

 squarish, but little broader than long. 



* "o^ty. snake ; Kvi8rj, nettle. 



