120 



THE OPHIURIDiE, 



Three equal, evenly spaced, rudimentary arm-spines. Tentacle pores 

 large, distinct to the 16th-20th joint, presumably continuing to the end of 

 the arm. First pore not opening into the mouth space. Tentacle scales : first 

 to fourth pore with two on each side; fifth and sixth with two on outer, 

 one on inner side ; from the sixth or seventh there are none on the inner 

 side, two on the outer side, and from the ninth or tenth there is only 

 one on the outer side. 



Color in alcohol : gray. 



Only three specimens: that described from Station 3400, 1322 f. ; further 

 one from Station 3375, 1201 f. ; and one from Station 3413, 1360 f. 



The last two specimens are larger: diameter of disk, 10 mm. Side 

 arm-plates meeting below only from the sixth joint, On one specimen the 

 scaling on the margin of the disk is rather incomplete, naked spaces being 

 seen between the scales. The other has 5-6 mouth papillae; first tentacle 

 pore has generally three scales on each side, the other pores as above 

 described, only that the scale on the inner side may continue farther out. 

 Upon the whole the three specimens differ very little from one another. 



13. Ophioglypha tumulosa n. sp. 



Plato T. Figs. 9-13. 



Diameter of disk, 31 mm. ■ width of arm close to disk, 6 mm. ; length of 

 arms c. 5 times the diameter of the disk. Eight short, close set mouth 





papillae on each side, the two outermost rather broad, the two innermos 

 conical; one pointed at the apex of jaw. Mouth shield almost square, an 

 obtuse angle within, outer and lateral sides straight, the corners rounded. 

 Side mouth shields long, narrow, meeting within. 



First ventral plate almost oval, though with an angle on each side. The 

 form of the following plates rather complicated. The second to third are 

 polygonal, wider without than within. The second has the outer edge 

 straight or a little concave ; on the third it is convex. Prom here the 

 ventral plates gradually take the form seen in Figure 12. Farther out 

 they become triangular, with an angle within, outer edge rounded, partly 

 with a little peak in the median line, lateral sides faintly sigmoidly curved. 

 The first two are broadly in contact; from the third, the part in contact 

 becomes narrower, and from the 7th to 10th joint they are separated. The 

 side arm-plates are almost straight, outer edge somewhat prominent, on large 



