OPIIIONEREIS XANTUSII. 



145 



Disk. Arms, 



0. reticulata 10.') 7(1 



0. Xantusii, 7.7 4(» 



0. porrecta, 1 2.0 113 



0. annulata, ll.o 84 



Lower Arm-plate. Miildle Arm-spine. 



. . . .7 l.G 



. . . .') 1.2 



. . . 1.0 1.7 



. . . .7 2.2 



LIST OF SPECIMENS, 



Catalogue 

 Number. 



Oripinnl I Number 

 Number. I uf Spec. 



Locality. 



When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



28 

 2'J 



30 



1038 

 1096 

 1097 

 1200 

 1191 



57 



Museum of Comparative Zoology. 



Panama. 



West Coast of Central 



America. 

 Panama. 



Smithsonian Institution. 



Panama. 

 Panama. 

 Panama. 

 Panama. 

 Cape St. Lucas, Cal. 



Alex. Ajjassiz. Alcoholic. 



University Museum, 



Copenlia^ren. 

 Dr. J. LcConte. Dried. 



Rev. T. Powell. Alcoholic 



Dr. J. LeConte. Dried 



J. Xautus. Akoiiolic, 



Opliionereis Xantusii Ltmax. 



Ophionereis Xantusii Lyman. Proceed. Boston Soc. Nat. Hist., VII. p. 258. 18G0. 



Special Marks. — Brownish straw-color, arms banded with dark 

 purple. Arms about five times as long as the diameter of the disk. 



Description of a Sjjecimen. — Diameter of disk, 7.7"" ; from outer 

 side of mouth-shield to outer corner of opposite mouth-slit, 3"° ; width 

 of arm without spines, 1.2™'°- ; length of arm, 40""° ; distance from outer 

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

 outer corners of mouth-slits, 1.2 : 1.5. Mouth-papilliiB, ten or eleven to 

 each angle of mouth, small, rounded, somewhat flattened. Teeth four, 

 thin, flat, squarish ; lowest one thicker, and with a rounded cutting 

 edge. Mouth-shields much rounded heart-shaped, with narrow end 

 inward ; length to breadth, 1 : .9. Side mouth-shields short triangular, 

 widely separated within. Under arm-plates squarish, a little longer 

 than broad ; outer side slightly curved ; lateral sides a little re-enter- 

 ingly curved ; inner laterals and inner side of about the same length, 

 and lying nearly in the same line ; length to breadth (seventeenth 



19 



