. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 344 DISCOVERY REPORTS Ophiomusium constrictum, St. WS871. 32. 53° 16'S, 64° 12'W, 336-341 m. 2 specimens. Diameter of disk 5 mm. Arms about three times that length, apparently not very stiff. Disk slightly elevated, covered with rather coarse scales, among which the primary plates are not very conspicuous. Radial shields separated by a wedge of scales, some- what sunken below the level of the surrounding scales. The disk scales are flat, but of a rather coarse structure, as if finely
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 344 DISCOVERY REPORTS Ophiomusium constrictum, St. WS871. 32. 53° 16'S, 64° 12'W, 336-341 m. 2 specimens. Diameter of disk 5 mm. Arms about three times that length, apparently not very stiff. Disk slightly elevated, covered with rather coarse scales, among which the primary plates are not very conspicuous. Radial shields separated by a wedge of scales, some- what sunken below the level of the surrounding scales. The disk scales are flat, but of a rather coarse structure, as if finely granulated, this granular appearance being more distinct on the radial shields. There is only a single column of fairly large scales in the interradii. The ventral interradii covered with few, rather large, irregular scales. The buccal shields irregular, with the proximal point separated off as a distinct little Fig. 52. Ophiomusium constrictum, Part of oral side («) and dorsal side (A); part of arm in side view (c). .: 15. Mouth parts of the usual type. First ventral plate small, rectangular, with the merest indication of a proximal angle. Only the two first ventral arm plates developed, and of the dorsal arm plates at most that of the first arm joint is present and then quite rudi- mentary. The lateral plates are strongly developed, swollen distally, constricted proximally; this constriction is limited from the swollen part by a rather distinct line and forms a kind of neck, the arms being thus rather distinctly moniliform. There are four rudimentary arm spines, the upper one placed a little apart from the others. Tentacle pores exceedingly poorly developed, only on the first joint are they at all distinct, totally lacking or merely discernible on the second joint. Genital slits very short and narrow, scarcely half the length of the first lateral plate. They are surrounded by some small irregular plates, the one to the adradial side being evidently the dista
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