150 
which are not visible in the latter species. In A. carchara the outer 
mouthpapilla is also long and spiniform and there would appear to 
be some differences between Å. hinemoæ and carchara also in the 
scaling of the disk (primary plates not seen in the latter) and in 
the shape of the dorsal plates. — These differences are not very 
important, it is true, but by the great geographical distance it would 
be quite unjustifiable to regard the New Zealand form simply as 
identical with the North Pacific form, since there are distinet dif¬ 
ferences. Especially, I should think the shape of the outer mouth¬ 
papilla a valuable character. 
29. Amphiura annulifera n. sp. 
Figs. 25. a—c. 
Plimmerton, under stones, at low water. 15/1.1915. 2 specimens. 
Diameter of disk, 3 mm, length of arms ca. 3 times the dia¬ 
meter of the disk. The scales in the middle of the aboral side of 
the disk rather coarse. The central plate distinet, but the other 
primary plates indistinguishable; towards the edge of the disk the 
scales are conspieuously smaller than in the middle. The scales on 
the oral side of the disk very fine. The radial shields are small, 
separated, divergent, equalling only Vs of the disk radius. The 
outer oral papilla fairly large, not spiniform. The oral shields are 
triangular, -with slightly rounded sides; adoral shields meeting within 
and adjoining the inner border of the genital slit with their outer 
edge. The ventral plates are elongate, somewhat longer than broad, 
with the sides almost straight and the outer edge slightly coneave, 
outer corners rounded; the proximal end truncate. One small, but 
distinet tentacle scale; pores small. The dorsal plates are fan¬ 
shaped, with the proximal end truncate, somewhat wider than long. 
4 short, cylindrical spines, of almost equal length. Genital slits 
narrow. 
The two specimens show a characteristic coloration, viz. a brown- 
ish ring round the mouth, across the mouth angles, proximal to the 
outer oral papilla; the species name refers to this feature. Other- 
wise they have no coloration. 
This small species is viviparous, two fairly large young ones 
being found in the one specimen, which was sacrificed for anatom- 
ical study. It disclosed the very important and interesting feature 
