OPIIIOPSILA ARANEA. 



151 



the end ; lengtlis to that of under arm-plate (thirteenth joint), .5, A, A, 

 A, .5, .8 : .5. Outside tentaele-scale minute, flattened, spiniform ; len<2^th of 

 inside scale to that of under aiiii-i)late, 1 : .5. Color, in alcohol : iieaily 

 miiibrm pale hrownish-gray, with numerous speeks of Idack pigment on 

 the hack and interl)rachial spaces of the disk, and on the upper arm- 

 plates; mouth-parts nearly white, with a hlaek speck on each mouth-shield. 



Variations. — The coloration in alcoholic specimens is nearly uni- 

 form, and the other characters vary little. A specimen with a disk of 

 S"""', had arms 100'"™ long. This may be considered an average pro- 

 portion. Almost always the tips of the arms are broken off. The 

 largest specimens have a disk of over ll""". 



0. liilsei has been found at St. Thomas by Mr. Iliise, but is appar- 

 ently not very connnon there ; and the same remark is true of the 

 Tortugas Islands, of Key West, and of some other parts of Florida ; but 

 at Cape Florida it has been taken in the greatest abundance. 



LIST OF SPECIMENS. 



Catalogue 

 Number. 



Orifrinal Number 

 Number. I of Spec. 



Locality. 



When 

 Collectea. 



Whence obtained. 



Nature of 

 Specimen. 



995 

 1177 



3Taseum of Comparative Zoology. 



Capo Florida. 



Florida ? 



Key West, Fla. 



Florida. 



Cape Florida. 



Florida. 



Apr. 1858. 

 Jan. 1858. 



Smithsonian Institution. 



124-1 C''*P® Florida. 

 1 Florida. 



G. Wurdcinan. 

 Prof. Ajiassiz. 

 J. E. Mills. 

 Prof. Agassiz. 

 G. Wurdeman. 

 Prof. Agassiz. 



G. AVurdeman. 



Alcoholic. 



Alcoholic 



Ophiopsila aranea Forbes. 



OpldopsUa aranea Forbes. Trans. Linn. Soc, XIX. p. 149. 

 Ophianoplus mannoreus? Bars. Nyt. Mag. for Naturvid., X. p. 23. 

 Ophiopsila marmorea Lutken. Addit. ad Hist. Oph., p. 136. 



LIST OF SPECIMENS. 



Catalogue 

 Number. 



Original Number 

 Number, of Spec. 



Locality. 



When 



Collected. 



Whence obtained. 



Nature of 

 Specimen. 



Museum of Comparative Zoology. 



424 



Alirer. 



Jardin des Plantes. | Alcoholic. 



