AMPHIURIDAE 285 



form at least represents a distinct variety, if not a distinct species (as is the opinion of 

 H. L. Clark, in his Catalogue of Recent Ophiurans). It might even be maintained that 

 they belong to two different genera, the Kerguelen form being a typical Amphhira, 

 whereas A. Eugetiiae, with two outer mouth papillae, should rather be referred to 

 AmpJiiodia. 



It is of importance to ascertain whether the Kerguelen form is viviparous like the 

 typical Eugeniae ; for if not, it is clearly a distinct species. For the present I prefer to 

 regard it only as a variety of Eugeniae, which must then take the name antarctica, Studer, 

 of which Amphiiira Sluderi, Lyman, becomes a synonym (cf. H. L. Clark, Cat. Recent 

 Ophiurans, p. 223). 



Hertz (Deutsche Siidpolar Exped., Ophiuroiden, p. 29) regards A. Mortenseni, 

 Koehler ( =A. Belgicae, Koehler, cf. above, p. 280) as a subspecies only oi A. Eugetiiae. 

 With this I cannot agree. As seen from a comparison of Fig. zi, A. Eugeniae, with Fig. 

 18, A. Belgicae, there is a conspicuous difference in the shape of the outer mouth papilla, 

 of the ventral arm plates, and particularly of the tentacle scales, to which is added the 

 important fact that in A. Belgicae the gonads are hermaphrodite, which they are not in 

 A. Eugeniae. It thus seems quite evident that we have here two distinct species. 



Hertz further established a variety gracilis of Eugeniae {op. cit., p. 30). Through the 

 kindness of Professor W. Arndt of the Berlin Museum I have had a couple of specimens 

 of this variety for examination. I find them to be not at all of the Eugeniae type, but very 

 clearly of the Belgicae type, as evinced by the shape of the outer mouth papillae, of the 

 tentacle scales, and the large size of the spines. I think this variety is merely a synonym 

 of A. Belgicae (cf. above, p. 280). 



Amphiura princeps, Koehler 



(Plate VII, fig. 10) 



Amphiura princeps, Koehler, 1907. Revision de la collection des Ophiures du Museum d'Htst. nat. 

 Paris. Bull. Sci. France Belgique, xli, p. 303, pi. xii, figs. 28-9. 



St. WS 89. 7. iv. 27. 9 miles N 21° E of Arenas Point Light, Tierra del Fuego, 23-21 m. 8 speci- 

 mens. 



St. WS 221. 4. vi. 28. 48° 23' S, 65° 10' W, 76-91 m. I specimen. 

 St. WS 776. 3. xi. 31. 46° 18' S, 65° 02' W, 107-99 m. I specimen. 

 St. WS 847. 9. ii. 32. 50° 16' S, 67° 57' W, 51-56 m. i specimen. 



This species has hitherto only once been recorded, and it is thus very satisfactory 

 that it has been taken by the ' William Scoresby '. The new localities do not markedly 

 extend its geographical range ; the species appears to be characteristic of the Magellanic 

 region. 



The figures given by Koehler being rather diagrammatic, I have thought it desirable 

 to give some new figures. In reference to Koehler's description I would point out that 

 the scales of the ventral interradii are rather thick, so as almost to give the impression of 

 being granules. The great variation in the shape of the buccal shields is mentioned by 

 Koehler; the heart-shape shown in Koehler's pi. xii, fig. 29, I have not observed, it is 



