20 



OPIIIURA BREVISPINA. 



of the arm ; length near base of arm, inside scale, A, outside scale, .2. 

 Color, in alcohol ; disk, above, greenish gray (gamboge and neutral 

 tint), clouded with lighter; upper side of arms very irregularly barred 

 Mdth several shades of greenish gray, and with dirty white ; edges of 

 upper arm-plates interrupted by very fine longitudinal streaks of 

 darker, giving the appearance of teeth ; edges of disk, below, same 

 as above, its central portion, together with mouth apparatus, under 

 surface of arms, and arm-spines, dirty white. 



Variatioiii^. — This is a pretty uniform species. Its color is usually 

 made up of several shades of sap-green, or of greenish gray, variegated 

 with dirty white or yellow, the under parts being much lighter and 

 less marked. Sometimes the green is replaced by lake-red. In speci- 

 mens not yet fully grown, the upper arm-spine is often shorter than 

 the others. 



Ophlura hrevispina differs from other oqual-spined Ophiura^ as follows : 

 from 0. hremcauda, in longer and Hatter spines and naked side mouth- 

 shields ; from 0. olivacea, in more octagonal under arm-plates ; from 

 0. guttata, in having unbroken upper arm-plates; from 0. Januaim and 

 0. variegata, in shorter and differently-shaped arm-spines. 



LIST OF SPECIMENS. 



Catalogue 

 Number. 



Original 

 Number. 



Number 

 of Spec. 



Locality. 



■When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



89 



90 



91 

 92 

 93 



94 



95 

 9G 



ior.5 



1059 



989 



1086 



1108 



Museum of Comparative Zoology. 



Cape Florida. 



Tortiigas, Fla. 



Cape Florida. 

 Florida. 

 Florida. 

 Cape Florida. 



West Indies. 



Cape Florida. 



Apr. 1858. 

 Mar. 1, 1858. 

 Feb. 185G. 



Apr. 1858. 



Smithsonian Institution. 



Florida. 



Cape Florida. 



Cape Florida. 



St. Thomas & Bahamas. 



St. Thomas, AV. 1. 



1851. 



G. Wnrd email and J. 



E. Mills. 

 G. Wiirdenian and J. 



E. Mills. 

 T. Lyman. 

 Prof. Ajrasslz. 

 G. Wurdeman. 

 G. Wtirdeman and J. 



E. IMIlls. 

 University Museum, 



Copenhafjen. 

 G. Wurdeman. 



G. Wurdeman. 



A. II. Riise. 

 A. II. Riise. 



Alcoholic. 



Dried. 



Alcoholic. 



