72 PROCEEDINGS OF THE ACADEMY OF [Feb., 



there are several rows of fine, imbricating scales. Radial shields 

 large, long, pear-seed-shaped; naked part two-thirds to one-half as 

 long as disk radius and about thrice as long as wide. Genital slits 

 long. Genital scales not very conspicuous unless the specimen is 

 dried, arranged in a row and overlapping one another. 



Oral shields small, pentagonal, with rounded angles, outer sides 

 longest, inner side slightly concave; maclrepofic shield much larger 

 than the rest, almost circular. Adoral shields small, triangular, 

 with concave adradial side, meeting neither radially or interradially. 

 Oral plates long and very narrows There is a more or less con- 

 spicuous buccal pore between each pair of oral plates, as in Ophio- 

 thrix. Two oral papillse on either side of each jaw, conical, blunt, 

 very stout; the distal one arises from the adoral shield and is longer 

 than the apical one, which arises from the dental plate. Teeth very 

 stout, truncate. 



Arms exceedingly long, more than thirty times as long as disk 

 diameter; they are widest at about one-third their entire length 

 from base. Dorsal arm plates almost oval, bounded within by two 

 nearly straight lines, forming a very large and obtuse angle, and 

 without by a curve, which is nearly flat towards median line, but 

 very strong laterally; about twice as wide as long, successive plates 

 slightly in contact with each other. On basal arm joints, they are 

 very small and separated by spaces, which are covered by a naked 

 skin. Lateral' arm plates not very prominent, almost covered by 

 arm spines, not meeting above or below, nor in contact on sides, but 

 separated by naked spaces. First ventral arm plate very small, 

 quadrangular, wider than long; those beyond, quadrangular, wider 

 than long, except basal one or two, which are as long as, or longer 

 than, w4de; they increase in size, especially in width, outwards, 

 and become pentagonal beyond disk, with large and obtuse inner 

 angle, rounded outer angles and notched distal margin; successive 

 plates separated by narrow spaces where ventral ends of lateral arm 

 plates are wedged in. Ventral arm plates often divided into halves 

 along median line. Arm spines six to seven on basal arm joints, 

 but five or six in middle part of arm, peg-like, flattened, blunt, lower 

 ones longer, nearly equal to, or slightly longer than, corresponding 

 arm joint, much flattened and thorny at end, except the uppermost 

 one or two; next to lowest, spur-shaped and very thorny. Large 

 tentacle pores, without scales. Color in alcohol: brown; the scales 

 around the radial shields are lighter; outer parts of arms grayish- 

 brown to gray. 



