126 



THE OPHIURIDiE. 



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in the figure). Under side of the disk covered with small scales only. The 

 edge of the disk sharp, both sides rounding equally towards it. Genital 

 scales narrow; in two pieces. Papilte along the genital slits very small, 

 close set, rounded 5 they become somewhat larger as they pass to the dorsal 

 side of the arm to form the arm-comb ; only about five papilloa to be seen 

 from above; they are not pointed. There is no secondary arm-comb. 



Four to five short, close set arm-spines, growing gradually longer from 

 above downwards ; they are nearer to the ventral than to the dorsal side. 

 First tentacle pore opening into the mouth space ; the next pores rapidly 

 diminishing in size, distinct to the 8th-9th joint. Tentacle scales : first pore 

 has 4-5 on each side ; second, three on inner, two on outer side; third, two 

 on inner, one on outer side; fourth, one or none on inner, one on outer 

 side ; and from the fifth there is only one on the outer side. 



Color in alcohol : gray. 



One specimen from Station 3425, 680 f. 



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16. OpMoglypha nana n. sp. 



Plate II. Figs. 10-12. 



Diameter of disk, 6 mm. ; width of arms close to disk, 1 mm. ; length of 

 arms unknown. Five short, square, close set mouth papilla; on each side, 

 and one diamond-shaped at the apex of jaw; the two outer ones broader 

 than the others. (It may be incorrect to name the outermost one a mouth 

 papilla ; it reaches from the first ventral plate to the inner end of the first 

 tentacle pore. In other species of OpUoglyplia that piece is evidently not 

 a mouth papilla like the rest of them, but here it seems to be so.) Mouth 

 shield pentagonal, an angle within, outer edge with a little peak in the 

 median line ; the corners rounded ; equally broad and long. Side mouth 

 shields rather short, narrow, of nearly equal width, meeting within. 



First ventral plate with inner edge rounded and an obtuse angle without. 

 Those beyond are triangular, with a little median peak on the outer edge, 

 the lateral sides are a little re-enteringly curved ; on the second to fourth 

 that is not distinct on account of the tentacle pores. They are equally long 

 and broad. Side arm-plates a little rounded, meeting broadly below from 

 the first, above from the second or third joint. Dorsal plates triangular, all 

 sides a little curved. The first three are of different shape ; the innermost 

 is quite rudimentary, separating the two parts of the arm-comb; its outer 



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