REPORT ON THE OPHIUROIDEA. 25 



interbrachial spaces is a radiating row of three large elongated plates, the outer and 

 longest being marginal. Eadial shields flat, longer than broad, oval, separated their 

 entire length by two large plates; length to breadth 2 '5 : 17 mm. Lower 

 interbrachial space filled by irregular transverse rows of uneven plates, the outer row 

 long and angular. Genital scales long, narrow, and broken in several pieces. Genital 

 opening not extending to margin of disk. Two short, blunt, tapering arm spines of 

 equal length, and about half as long as an arm joint. One large rounded tentacle scale 

 on the inner side of each tentacle pore. Colour in alcohol, white. 



Station 214.— February 10, 1875 ; near Philippines ; lat. 4° 33' N., long. 127° 6' E. ; 

 500 fathoms ; wlobisrerina ooze. 



Ophiozona (?) duhia, Lym., Bull. Mus. Comp. ZooL, vol., v. part 9, p. 224, pi. ii. figs. 

 19-21, 1878. 



Station 23. — March 15, 1873 ; close to Sombrero Islands ; 450 fathoms ; globigerina 

 ooze. 



Species of Oi^hiozona not herein described. 

 Ophiozona jyacifica, Lym., IlL Cat. Mus. Comp. ZooL, No. i. p. 67, 1865. 



O^Molepis imclfica, Ltk., Vid. MeddeL, March, 1856, p. 22; Addit. ad Hist., part 2, jx 104, 

 pi. ii. fig. 4 ; Vll., Trans. Conn. Acad., voL i. part 2, p. 257. 



Puntarenas ; Panama ; 1 fathom. 



Ophiozona tessellata, Lym., Bull. Mus. Comp. ZooL, vol. v., part 9, p. 223, pi. iii. figs. 

 43-45, 1878. 



West Indies ; 242 fathoms. 



Ophiocera^nis. 

 Ophioceramis, Lym., lU. Cat. Mus. Comp. ZooL, No. i., 1865. 



Disk covered with radial shields and stout plates, none of which are surrounded by a 

 belt of small ones. Over the base of each arm, a small notch in the disk. Genital scales 

 concealed. Teeth. Tooth papillae. Mouth papillse. Side mouth shields small, and not 

 meeting within. No supplementary pieces to the upper arm plates. Two genital openings, 

 beginnina; outside the mouth shields. 



WhUe the genital plate is not unlike that of Ophiozona, the genital scale is shorter, 

 being attached at some distance inward from the head of the plate ; and, instead of a 

 thick peristomial plate there is only a rudimentary crust covering the nerve ring. In 

 respect to the mouth angles, there is no similarity with the group of Ophiolepis, &c. 

 Not only are the mouth frames much larger with wide crested wings, but the first arm 

 bone has an unusual form and is very long and large. (See PL XXXVII. figs. 16-18.) 



(ZOOL. CHALL. EXP. PART XIV. 1882,^ 4 



