52 



OPIIIOGLYPHA AFFINIS. 



having a diameter of 1.2""'" ; below, scales more regular, thinner, and, 

 on the average, smaller. Radial shields like the other disk-scales, about 

 as broad as long, irregularly angular or rounded, joined without, sepa- 

 rated within by a single scale ; length, .6""°-. The papilla comb at the 

 base of the arm consists of eight rather stout, flattened papillie, with 

 rounded ends ; the uppermost are the largest, and attain a length of 

 2mm. rpi^g papilliB aloug the edges of the genital slits are fine, sharp, 

 and scattered. Arm-spines (includhig tentacle-scales) near base of arm, 

 seven, extremely short and blunt, standing close together ; those in the 

 middle a little the longest, though hardly more than .1™°'' in length. 

 The tentacle-scales on the inner side of the pores become, in this spe- 

 cies, identical with the lower arm-spines ; on the outer side of each pore 

 there are, near the base of the arm, several small, stout tentacle-scales. 

 Color, in alcohol, l)rownish gray. 



Variations. — Dr. Liitken gives the proportion of the arms to the 

 disk as 10 to 6. 



O. Stuwitzii has been found at Greenland and at Newfoundland. It 

 is distinguished from O. nodosa by differently shaped under arm-plates, 

 and an irreg-ular arrano-ement of disk-scales. 



LIST OF SPECIMENS. 



Ophioglypha affinis Lyman. 



OpJiiura ajfinis Lutken. Arldit. ad Hist. Oph., p. 4.5. 1858. 

 ? Ophiura Normam Hodge. Trans. Tyn. N. II. Club, Vol. V. Pt. IV. p. 296. 



LIST OF SPECIMENS. 



Catalofrue Original ! Number 

 Number. Number, of Spec. 



Locality. 



When 



Collected. 



Whence obtained. 



Nature of 

 Specimen. 



Museum of Comparative Zoology. 



43 



Oresund. 



University Museum, 

 Copenhagen. 



Alcoholic. 



