OPHIOMYXIDAE 243 



Specimens belong to the type with numerous small embryos in the bursae. The speci- 

 mens, which are not very well preserved, show an indication of dark bands on the arms ; 

 otherwise they are white. 



Ophioscolex (Ophiolycus) nutrix, n.sp. 



(Plate VII, fig. 6.) 



St. 159. 21. i. 27. 53° 52' S, 36° 08' W, South Georgia, 160 m. 2 specimens. 



St. 160. 7. ii. 27. 53° 43' S, 40° 57' W, near Shag Rocks, South Georgia, 177 m. i specimen. 



St. WS 42. 7. i. 27. 54° 42' S, 36° 47' W, South Georgia, 198 m. 2 specimens. 



St. WS 86. 3. iv. 27. 53° 53' S, 60° 34' W, Falkland Islands, 1 51-147 m. i specimen. 



St. WS 225. 9. iv. 28. 50° 20' S, 62° 30' W, Falkland Islands, 162 m. i specimen. 



St. WS 228. 30. vi. 28. 50° 50' S, 56° 58' W, Falkland Islands, 229-236 m. 4 specimens. 



St. WS 824. 19. i. 32. 52° 29' S, 58° 27' W, Falkland Islands, 146-137 m. 2 specimens. 



St. WS 839. 5. ii. 32. 53° 30' S, 63° 29' W, Falkland Islands, 403-434 m. i specimen. 



Diameter of disk up to ca. 10 mm., length of arms about three to four times the dia- 

 meter of disk. Both aboral and oral sides of disk with a varying number of small spines, 

 protruding through the thick investing skin; in the specimen figured in Plate VII, 

 fig. 6, they are exceptionally numerous. Radial shields small, but fairly distinct, oval, 

 widely separated — but in some specimens no trace of radial shields is seen. 



Fig. 3. Ophioscolex nutrix, n.sp. a, Part of oral side, b. Part of dorsal side, x8. 

 c. Side view of distal arm joints, showing the two upper spines transformed into 

 hooks, '30. d. Spicules from stomach wall, X45. 



Mouth papillae rather irregular and varying in number ; generally the distalmost one 

 or two are somewhat enlarged. Buccal shields conspicuously broader than long, with 

 an obtuse angle within and a straight outer edge. Adoral shields joining within. Ventral 

 plates contiguous in the proximal part of arm, separated beyond the disk; the distal 



