164 Bvlletin Vanderbilt Marine Museum, Vol. VII 



small flat half circular to half oval scales. There is a central large 

 circular scale, the circumference of which is uniformly margined 

 with small, squarish to rectangular scales. Around this central 

 scale are five similar large scales, overlapping to form a rosette, 

 and beyond these are many other similar smaller scales, increas- 

 ing the rosette pattern. In each interbrachial area there is, in 

 the median line, a series of three large scales, forming a sort of 

 band from the central rosette to the lateral margin; on either 

 side of this band there is a bordering band, composed of similar, 

 but definitely smaller scales, which also margin the radial area. 



The actinal surface has the interbrachial area paved with scales 

 similar to those of the abactinal surface. All of these scales are 

 on the exposed or convex margins with a band of small squarish 

 or rectangular scales. The genital slit is long, bordering the in- 

 serted arm for a distance equal to four or five under arm plates, 

 extending from the jaw-angle almost to the circumferal margin 

 and margined on either side by narrow linear plates, similar in 

 width to the small squarish scales that margin the larger ones. 



The central mouth shield is rather large, filling the entire 

 apex of the interbrachial angle ; the outer margin is widely convex 

 and is bordered by a linear series of scales like those of the other 

 squamae; the inner margins of the shield are two oblique lines 

 converging to form an acute apex. The side mouth shields are 

 large, subrectangular, extending along the oblique inner margin 

 of the central shield and almost meeting at the apex, being sepa- 

 rated by a small squarish plate, or two smaller plates. The jaw 

 angle contains five coarse mouth papillae on either side ; the outer- 

 most of these is long triangular, the next two being squarish, 

 while the fourth and fifth papillae are smaller, squarish. The 

 central teeth are coarser than the papillae, wider than long with 

 the cutting edge rounded, or in some instances subacute. 



The ventral arm plate is distinctly axe-blade shape, with the 

 distal margin widely convex, its width being a little more than a 

 third of the total width of the arm ; the lateral margins of the ven- 

 tral arm plate are concavely excavate for their greater part beside 

 the tentacle scale, and beyond this area proximally the lateral mar- 

 gin becomes a short oblique line directed inward. The inner margin 

 is almost as short as one of these oblique lateral lines and is almost 

 straight or very slightly concave. The ventral plate is a little 

 longer than its greatest width. 



