62 OPHIOCERAMIS, 



LIST OF speci:mens. 



Catalogue 

 Number. 



Oripinal Number j^ 



Number, of Spec. ^ 



When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



Museum of Comparative Zoology. 

 331 I . . I 1 I KinjTsmills Islands. I I A. Garrett. I Alcoholic. 



OPHIOCEEAmS* LYiLiN. 



Ophiolepis Mull. & Trosch., pars. 



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 scales concealed. Teeth. Tooth-papilla?. 

 Mouth-papillffi. Side mouth-shields small, and not meeting withm. 

 Arm-spines arranged along the outer edge of the side arm-plates. No 

 supplementary pieces to the upper arm-plates. Two genital slits, begin- 

 ning outside the mouth-shields. 



Ophioceramis Januarii Lyman. 



Ophiolepis Januarii Lutken. Yidensk. Meddelelser. Jan., 1856. 

 Ophiolepis Januarii Lutken. Addit. ad Hist. Oph., p. 108. 



Special Marks. — Arms four and a half or five times the diameter of 

 the disk, which grows as large as ID"""'. Three (sometimes four) arm- 

 spines, the middle one longest; all of them stout, tapering, and flat- 

 tened. 



Description of a Specimen. — Diameter of disk, lO"""-; from outer side 

 of mouth-shield to outer corner of opposite mouth-slit, 7.5°""-; width of arm 

 without spines, 4.5™" ; length of arm, about 82°''"- ; distance from outer 

 side of mouth-shield to inner points of mouth-papilla?, to that between 

 outer comers of mouth-sUts, 2.8 : 3.6. Mouth-papilloe four on each side, 

 small, rounded, flattened, and close set ; outermost one sharp, and over- 



* '0(^ii, snake ; Kfpafxis, tile. 



