220 Southern Cross. 



dilate on it here. It is of some interest to note that Gray's 

 specimens were collected by Koss in the " South Polar Seas." 



Hhtrihidlon. — Circumpolar. 



Stations. — Cape Adare : 20-24: fathoms : Jan. l^nd ami '.itli, 

 1000 (2ir F.). 



Cape Adare : 20 fathoms : Nov. 10th, 18<J'J (28 F.). 



Franklin I.shind : 20-24 fathoms : Feh. l»Lh, lUOO (29-8' F.). 



EXPLANATION OF PLATES. 



Plate XXVI. 

 Ophiosteira antaretica. 



Fig. 1. — Tlie animal, natural size, from above. 



Fig. 2. — The disc, from above, magnified four times, showing the large keel- 

 shai)ed plate between the radial shields. 



Fig. 3. — The same, showing an abnormal increase and diminution of the i>lates 

 in two rays, x 4. 



Fig. 4. — The disc from below, magnified four times, showing the Ophiura-like 

 arrangements of the oval skeleton. 



Fig. 5. — The disc from the side (interradial view), x 4. 



Fig. 6. — An arm, near its base, from above, x 8. 



l"ig. 7. — An arm, from the side, showing the gap between the ujiper arm- 

 plates, X 8. 



Fig. 8. — An arm, from below, showing the small mider arm-plate, the large side 

 arm-plates meeting in the middle line below, and the short arm-spines, x 8. 



Figs. 0, 10, 11. — Views of the arm at some distance from the base, from above, 

 from the side and from below, all x 8. 



Platk XXVII. 



Five phutogra]ihs of the disc of Oj'hiostcira antaretica to show the extraordinary 

 variations of the plates of the disc. 



Plate XXVIII. 

 Opliionotus vietoriae. 



Fig. 1. — The creature from above, natural size. 



Fig. 2. — The disc, from below, x 2, showing the same Opldura-\\ke character of 

 the mouth as Ojiliiostrira. 



Fig. 3. — An arm, near the base, from above, x 4, showing the way in which the 

 side arm-plates encroach u]ion the ujiper arm-]4atcs, and their mode of breaking up. 



Fig. 4. — Tlie same, from below, x 4, showing the encroachment of the side arm- 

 l)late8 on the under arm-j)lates. 



Figs. 5, U. — An arm near its end, from above and from below, x 4. 



