-TJ— -L. 



THE OPHIUIUD^. 



163 



42. Ophionereis nuda n. sp 



Plate XIV. Figs. 7 9- 



1 



r 



Diameter of disk, 8 mm. ; width of arm close to disk, witliout spines, 

 l.Y mm. ; length of arms, about ten times the diameter of the disk. Five 

 mouth papilla) on each side, rather long, more or less conical, the outer one 

 a little apart, being the most pointed. At the apex there maj be a very 

 small papilla. Mouth shield a little broader than long, with a rounded 

 peak within, restricted at the outer end ; outer edge straight, inner sides 

 curved, corners rounded. Side mouth shields very narrow, scarcely meeting 

 within, a little broader at their outer end. 



First ventral plate small, with outer edge curved, inner edge and sides 

 almost straight. Those beyond a little longer than wide ; all broadly in con- 

 tact, with inner angle truncated, outer edge curved or straight on the first 

 two joints, from the third, concave. Outer corners rounded; inner laterals 

 very short, outer long, both re-enteringly curved. Side arm-plates with 

 spine-ridge not very prominent; there is a naked space separating the side 

 plates of each two adjoining joints. Dorsal plates with inner edge about 

 twice as wide as the outer; the supplementary plates very conspicuous. 



The disk is naked above and below; only along the abradial side of radial 

 shields there is a little space covered with small scales, which extends farther 

 inwards from the inner end about as far as their length. Besides these, 

 there are no scales at all on the disk. The radial shields are very small, 

 elongated-triangular, widely separated. The genital scales are rather dis- 

 tinct, beset witli few small papilla). 



Three rather thick, somewhat curved arm-spines, a little longer than an 

 arm-joint, the upper one a little shorter than the others. One large, oval 



tentacle scale. 



Color in alcohol : brown ; the arms in the one specimen uniformly brown, 



in the other with a dark brown spot on the side plate of each fifth joint, the 

 other joints being light brown or whitish. 



Two specimens from Stations 3397, 85 f., and 3405, 53 f. 



This species apparently is nearly related to Oj^hiotrUon Scmoni Doederlein 

 (28), (p. 288, Taf. XV. Fig. 8 u. 8 a). We have not named it Oplmtriton, 

 but ' Ophionereis, as we do not think it necessary to make a separate genus of 

 those specifcs with a naked skin. (Upon this character alone OpMotrilon was 



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