140s A. E. Verrilli—Marine Fauna of North America. 
each plate ; they are comparatively short near the base of the 
arms, but soon become much longer and more slender, and so 
continue to near the end. Just outside of these, on each side, 
along most of the arm, there are transverse clusters of four or 
forming prominent ridges, which bear long, slender, sharp 
spines, in simple, transverse series; between these ribs the 
skin is naked and there are numerous slender scattered papulzx. 
The transverse rows of dorsal spines continue to or beyond the 
u had : 
ellowish, well-developed. Length of adambulacral spines, at 
eae of arm, 5™; in mi 
lateral] spines, along middle of arm, 12 to 14™™; including the 
sac, 16™™ olor, pale orange-red, in alcohol, when first re- 
Commission. 
This species is related to B. coronata G. O. Sars, but it has 
much larger and stouter arms, and much larger adambulacral 
spines, and more numerous lateral and dorsal ones. Our spect- 
men was found clinging to the branches of Paragorgia arborea. 
