AMPHIURIDAE 



283 



the inner part of the interradii being half naked, a feature specially distinct when the 

 interradii are swollen on account of the ripe gonads. In dried specimens this half-naked 

 condition may be less distinct because of the contraction. 



Buccal shields spade-shaped, with a small but distinct outer lobe. Adradial shields 

 broad, without or with an outer prolongation separating the buccal shield from the 

 first lateral plate. Outer mouth papilla rather broad, rounded. Ventral plates of the 

 usual form, with straight or slightly concave distal edge; the proximal ones contiguous. 

 Dorsal arm plates rounded fan-shaped, slightly contiguous. Four rather coarse, smooth 

 arm spines ; two tentacle scales proximally ; farther out, and in the younger specimens, 

 only one or none. Colour of preserved specimens white. 



fes^ 



Fig. 20. Amphhira da Cunhae, n.sp. Part of oral side («) and dorsal side (6). X22'5. 



The species has separate sexes, but the eggs are rather large, so it is not improbable 

 that it will prove to be viviparous. There is only one female gonad at each bursa, placed 

 interradially ; two male gonads, likewise at the interradial side of the genital slit. 



It seems evident that this species is closely related to the South African A. albella, 

 Mortensen, from which it is distinguished mainly by the more scale-covered ventral 

 interradii. Perhaps it should rather be designated only as a variety of the South African 

 species. Because of the very scanty material as yet available of both (only two specimens 

 of ^. albella are known, from off Durban) I think it preferable to regard them, for the 

 present at least, as two distinct species. The present species seems also to be nearly 

 related to A. Richardi, Koehler; but Jl. Richardi is a much larger form, some 10 mm. 

 in diameter of disk, whereas A. da Cunhae is full grown (at least fully mature) at a size 

 of 3 mm. diameter. 



Amphiura Eugeniae, Ljungman 



Amphiura Eugeniae, Ljungman, 1867. Ophiuroidea viventia hue usque congnita. Ofvers. K. 



Vetenskaps-Akad. Forhandl., 1866, p. 31 8. 

 A. Eugeniae, Ludwig, 1899. Ophiuroideen Hamburger Magalh. Sammelreise, p. 8. 

 A. Eugeniae, H. L. Clark, 1915. Cat. Recent Ophiurans, p. 225, pi. iv, figs. 9, 10. 



