REPORT ON THE OPHIUROIDEA. 73 



one or two rows of smaller ones, and in the interbracliial spaces are two larger plates, one 

 marginal and the other inside it. Eadial shields very nearly round, separated usually by 

 three plates in a line ; length to breadth 3:3; along their inner margin is a row of small 

 irregular-shaped scales. Genital plates formed of two or more pieces, wider without, 

 tapering inward ; along the outer portion of their free edge is a row of small shapeless 

 pieces, which become more numerous above, and there form a sort of arm comb. One 

 minute papilla-like arm spine situated near the junction with the upper arm plate. Pores 

 of mouth tentacles enclosed on one side by the two outer mouth papillae, with some other 

 minute pieces ; and on the other side by four or five similar parts, which correspond to 

 tentacle scales : the rest of the pores stand near the lateral corners of the under arm 

 plates, and have three small peg-like tentacle scales. Colour in alcohol, yellowish-brown 

 or grey. 



This species clearly exhibits the homology between side mouth shields and side arm 

 plates. 



Station 150.— February 2, 1874; lat. 52° 4' S., long. 71° 22' E. ; 150 fathoms; 

 rock. Station 151. — February 7, 1874; off Heard Island ; 75 fathoms; mud. Christ- 

 mas Harbour, Kerguelen Islands, 120 fathoms. Royal Sound, Kerguelen Islands, 28 

 fathoms. 



Ophioglypha inornata, Lym. (PI. III. figs. 10-12). 



OpMoglypha inornata, Lym., Biill. Mus. Comp. Zool., vol. v., part 7, p. 97, pi. ii. figs. 

 26, 27. 



Side mouth shields small. Mouth shield broader than long, with a peak inward. 

 Disk and arm plates thick, swollen, and closely soldered. Mouth papillae and scales of 

 mouth tentacles thick, squarish, irregular, and crowded. 



(Type specimen from Station 106.) Diameter of disk 10 mm. Length of arm 

 about 23 mm. Width of arm close to disk, without spines, 2 mm. Five or six 

 short, bead-like, closely soldered mouth papillae on each side, with one much longer 

 at apex of jaw. Mouth shields broader than long, small, rounded triangular, with 

 angle inward, and outer edge curved. Side mouth shields short, pointed oval, 

 occupying inner sides of the mouth shield and meeting broadly within. First under 

 arm plate rounded, with a long curve within and an obtuse angle without ; second 

 pentagonal, with an angle inward, outer side wide, and laterals re-enteringly curved ; 

 beyond these the plates become broader than long, with an angle within and a 

 curve without. Side arm plates thick, slightly swollen, meeting broadly below ; 

 separated above by upper arm plates, which are thick, rather small, of a rounded 

 diamond shape, and as long as broad. Disk rather thick, swollen, covered \vith thick, 



([zool. CHALL. EXP. PART XIV. — 1882.) 10 



