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



acquire the shape of a transverse oval, with a httle peak without and within. Side arm 

 plates even, giving a tubular figure to the arm, meeting below, but separated above by 

 the upper arm plates, which are as long as broad, and in shape long hexagonal, with the 

 three outer angles almost blended in a curve. Disk smooth, covered with small, delicate, 

 irregular, ill-defined, closely-soldered scales ; radial shields long, pear-seed shape, over- 

 lapped along their edges by the surrounding scales, diverging inward and separated their 

 entire length by a wedge of smaller and larger scales ; in centre of disk one large round 

 primary plate, and another in each brachial space, lying close to inner ends of radial 

 shields. Disk, below, covered with very fine irregularly-shaped scales. Genital openings 

 edged with fine, closely-set papillae, growing larger as they pass upwards along the 

 outer edge of genital scale, which is long, narrow within, broad without, and divided in 

 several pieces. Three short and blunt arm spines, situated low on the side arm plates, 

 close to the tentacle pores, and one long tapering spine, just below the junction of the 

 upper arm plate. Tentacle scales short and rounded ; to each mouth tentacle seven on the 

 interbrachial side, and three longer and tapering on the brachial edge ; beyond there are 

 at first five on the interbrachial and four on the brachial edge, after which they diminish 

 rapidly in number and size. The long arm spine readily drops oif. Colour in alcohol, grey. 



Ophioghj2ilia lepida and its kindred species form an intermediate type between the 

 shallower, like Ophioghjpha alhkla, and the deep-sea, of which Ophioglypha hullata is 

 the extreme. 



Station 46.— May 6, 1873 ; lat. 40° 17' N., long. 66° 48' W. ; 1350 fathoms ; mud. 

 Ofi" Bermuda ; 750 fathoms. Station 76.— July 3, 1873 ; lat. 38° 11' N„ long. 27° 9' W. ; 

 900 fathoms ; globigerina ooze. Station 45.— May 3, 1873 ; lat. 38° 34' N., long. 72° 10' 

 W. ; 1240 fathoms; mud. Station 343.— March 27, 1876 ; lat. 8° 3' S., long. 14° 27' 

 W. ; 420 fathoms ; coral. 



Ophioglyp)ha Ijungmani, Lym. (PI. IV. figs. 8-10). 



Ophioghjpha Ijungmani, Lym., Bull Mus. Comp. ZooL, vol. v., part 7, p. 71, pi. iii. fig. 77. 



Three arm spines ; one long and high up, two short and low down. Radial shields sepa- 

 rated ; disk scales small and curved. Disk thin, with rather delicate scales. Arms slender. 



(Type specimen from Station 122.) Diameter of disk 8'5 mm. Length of arm about 

 45 mm. ; width of arm without spines close to disk 2 mm. Four or five short flat mouth 

 papillae on each side, and one or two longer pointed papillae at apex of jaw. Mouth shield 

 rounded, triangular, or inclining to rounded-pentagonal, with an angle inward, longer than 

 broad, outer edge curved. Side mouth shields very narrow, wider without, tapering within, 

 where they nearly or cjuite meet. First under arm plate broad triangular, with lateral 

 corners truncated and outer edge curved ; second, third, and fourth plates widely penta- 

 gonal, with an angle inward ; beyond these they are small, broader than long, with an 

 obtuse angle inward and a curved outer edge. Side arm plates slightly projecting at 

 their outer edge, meeting l^roadly below laeyond the disk ; separated above l^y the upper 



