132 



THE OPHIURIDiE. 



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very delicate spines along the outer part of the genital slits (not seen in 

 the figure). Arm-comb consisting of only a few spines on each side, along 

 the outer edge of the radial shields, not continuous over the arm-basis. 

 There are also some few (4-6) papilla) along outer edge of first dorsal 



plate. 



Three arm-spineS; close together, sharp, slender, tapering; the upper one 



on the first 5-6 free joints somewhat longer than one joint, sometimes as 

 long as two joints, farther out scarcely as long as one joint 3 the two other 

 spines shorter, the lowest one the shortest. First tentacle pore, as common 

 in this genus, not opening into the mouth space. For the other pores it is to 

 be remarked that they do not touch the ventral plates, but He wholly in 

 the side plates, near the side of the arm. (This is also the case in O. scri- 

 ceum Forb., though not so evident as here.) Tentacle scales; first pore 

 with one on outer side, two, seldom three, on inner side ; the rest all with 

 one conspicuous scale on the outer side, next the lowest arm-spine. On the 

 second to fifth or sixth there is also seen a little scale at the distal end of 



the pore. 



Color in alcohol : gray. 



Stations 3363, 978 f. ; 3365, 1010 f. 3 3371, 770 f. ■ 3375, 1201 f. ; 

 3376, 1132 f.; 3380, 899 £ ; 3392, 1270 1; 3393, 1020 f. ; 3398, 1573 f. ; 



3400, 1322 f. 



Most of the specimens rather badly preserved. There are sometimes 

 five mouth papilte on each side, and they may be a httle more pointed than 

 in the figure, though never spiniform. Besides that there are no variations 

 worth mentioninfjr. 



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19. Ophiomusium glabrum n. sp 



Plate IV. Figs. 7-9. 



Diameter of disk, 32 mm. ; width of arms close to disk, 6 mm. ; length 

 of arms, 5-6 times the diameter of disk. Seven to eight close set square 

 mouth papilla3 on each side, and one diamond-shaped at apex of jaw ; the 

 two-three outer ones a little longer than the rest. Mouth shield small, trian- 

 gular, mostly restricted at the outer corners, with an acute angle within and 

 outer edge straight ; a little longer than broad. Side, mouth shields long, 

 broader without than within, where they meet. 



First ventral plate transversely elongated (in other specimens it is not so 





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