68 THE VOYAGE OF H.M.S. CHALLENGER. 



a row of minute papilla}, which become somewhat longer as they appear above the arm 

 to form the comb. Two, and sometimes three, small, delicately tapering arm spines, 

 about half as long as a joint. Tentacle scales on first pair of pores, three on either side ; 

 on the second, three or four on the interbrachial side, and two on the brachial ; third 

 pair the same, but only one on the brachial ; beyond there are three long blunt scales on 

 the interbrachial side. Colour in alcohol, white. 



Although from only 129 fathoms, this species has the look of a deep-sea 

 inhabitant. 



Station 192.— September 26, 1874 ; lat. 5° 42' S., long. 132° 25' E. ; 129 fathoms ; 

 mud. 



Ophioglypha rugosa, Lym. (PI. III. figs. 13-15). 



Ophioglypha rugosa, Lym., Bull Mus. Comp. Zool., vol. v., part 7, p. 92, pL iv. figs. 90, 91, 

 1878. 



Disk covered with much swollen, lumpy plates. Genital scales wide, thick, and in a 

 single piece. Basal under arm plates longer than wide. Papillas of arm comb short, 

 flat, close set, and with rounded ends. 



(Type specimen from Station 169.) Diameter of disk 7 mm. Width of arm close to 

 disk 1*5 mm. Four short tooth-like mouth papilla? on each side, with one larger at apex of 

 jaw. Mouth shields pentagonal ; outer and lateral sides straight, with very blunt angle 

 within; outer corners rounded ; length to breadth 1*3:1. Side mouth shields narrow, 

 with a wavy outline, meeting within. First under arm plate triangular, with an angle 

 within and outer side curved ; second plate longer, with inner angle truncated ; beyond 

 this they are pentagonal, with outer side curved, lateral sides re-enteringly curved, and 

 an angle within. Side arm plates broad, meeting below, but separated above, near base 

 of arm, by the upper arm plates, which are long wedge-shaped, with outer edge curved, 

 and an angle within, except the first two, which have the inner angle truncated. Disk 

 angular, covered with large, much swollen plates, having deep furrows between them ; 

 in centre a group of six primary plates, separated by a row of irregular smaller plates ; 

 outside of these is another circle of ten equally large plates, of which the brachial ones 

 separate the inner ends of the radial shields. In each interbrachial space there is also 

 a large marginal plate. Eadial shields longer than broad, outer edge much wider than 

 inner, joined without, but widely separated within by a large rounded plate. Length 

 to breadth 2:1. On the under surface the plates are not so much swollen, and more 

 regular ; in each interbrachial space are about three concentric rows, of from three to 

 five plates each. Genital plates long and rather wide, with outer end wider than inner ; 



