160 Bulletin Vanderbilt Marine Museum, Vol. VII 



acute point directed inward. The adjacent mouth papilla is large, 

 squarish or irregular shape, distally blunt; twice as wide as the 

 third mouth papilla, which is longer and more pointed than the 

 second one, which is subequal to the first mouth papillae, each of 

 these two being a little longer and more pointed than the teeth. 

 There are two teeth, each one being oval in contour, distally acute. 



The arms are five, long and very tapered, about 108 millimeters 

 long. The under arm plate is widely convex on the distal margin, 

 recurvate, the inner margin short, concealed by the overlapping 

 of the adjacent plate. There are two tentacle scales, on either side 

 of the under arm plate. The outey scale is widely oval and longer 

 than the inner one, which is applied to the anterior side margin 

 of the under arm plate and is more narrowly oval and sometimes 

 subacute on its free distal margin. The side arm plate extends 

 narrowly upon the ventral surface and also upon the dorsal, the 

 distal margin being moderately convex. This plate supports three, 

 long acicular spines which definitely increase in length from the 

 ventral to the dorsal. Each spine has the surface roughened with 

 fine serrations in approximate longitudinal series, these being 

 spinulose along the margin and tip. About every seventh or 

 eighth joint of the arm the dorsal spine is greatly elongated and 

 thickened, sometimes tapered distally, but more frequently com- 

 pressed and abruptly truncate with serrate or spinulose margin. 

 The dorsal arm plate is rhomboidal, in some cases approaching 

 hexagonal, because the widely convex distal margin tends to break 

 into a median and two lateral parts. The lateral margins are 

 oblique, closely bordered by the side arm plates and the proximal 

 margin is narrowed to one-half or less the width of the distal 

 margin. The surface of all the arm plates is microscopically gran- 

 ulose. 



The species has a striking color design. The original colors 

 have been described by Dr. H. L. Clark and others. The present 

 specimens, preserved for five years in alcohol, show the disk macu- 

 lated with dark brown and white in a pattern of irregular shaped 

 figures on both the abactinal and actinal surfaces and the spines 

 of the disk are transversely ringed or partially ringed by inter- 

 rupted dots of brown alternating with cream. The arms are trans- 

 versely ringed on all surfaces with alternating brown and cream, 

 the proximal half of each the dorsal, side and ventral arm plates 

 is brown, the distal portion being a cream banding. The three 



