80 



OPHIOCOMA ^ETHIOPS. 



Variations. — In other specimens the disk was to the arms as 29 : 145, 

 32 : 1G2, 10.5 : 56. Tentacle-scales vary much in number on specimens 

 of same size, and even on same individual ; occasionally there are regu- 

 larly t^yo scales to each pore as far out as the thirty-third joint, but this 

 is unusual. Tooth-papilla3 commonly arranged in five regular horizontal 

 rows, of three each. Granulation of disk does not always cover whole 

 of interbrachial spaces below, but a broad band may be left running 

 along the genital slits, and outside the mouth-shield. Color varies to a 

 certain extent. It may be even dirty white, blotched with dark brown, 

 on the upper side of the disk, with lower side of arms very light Ijrown, 

 the lower arm-plates being more or less mottled ; extremities of arms 

 may be banded with darker and lighter. A young one having a disk 

 of 10.5""°" was similar to the larger specimens, but had the arms banded 

 for their whole length, the arm-plates speckled with lighter, the mouth- 

 papilla3 regular and bead-hke, and the tooth-papillae in horizontal rows 

 of only two each. 



This species is distinguished from 0. echinafa and 0. R'dsei by wider 

 and flatter arms, and by differently shaped arm-spines and mouth- 

 shields. 



LIST OF SPECIMENS. 



Catalogue 

 Number. 



Original Number 

 N umber, of Spec. 



Locality. 



When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



1007 

 1008 

 1011 

 1185 

 1170 

 1190 



4 

 4 

 1 

 4 



12+ 

 5 



Museum of Comparative Zoology. 



Acapulco, Mexico. 



Panama. 



Panama. 



Cape St. Lucas, Cal. 



Sinithsonian Institution. 



Panama. 



Panama. 



Panama. 



"West Coast Nicaragua. 



Cape St. Lucas, Cal. 



Cape St. Lucas, Cal. 



Alex. A<i;assiz. 

 Alex. Aijassiz. 

 Alex. Agassiz. 



J. Xantus. 



Dr. Sternbergh. 

 Rev. T. PoweU. 

 Dr. Suckley. 

 Capt. Dow. 

 J. Xantus. 

 J. Xantus. 



Alcoholic 



Alcoholic. 



Dried. 

 Alcoholic. 



