163 
Key to the New Zealand species of Amphiuridae. 
1. Oral papillæ forming a continuous series along each side 
of jaw; more than one outer oral papilla. 13 
Only a single outer oral papillæ, widely separated from 
the inner, infradental papilla; in the interval between 
these papillæ there is one situated at a lower level in 
the mouth, belonging to the First tentacle.. 2 
2. Two tentacle scales, at least in the proximal part of the 
arm. No spines on the disk. 3 
Only one tentacle scale; no spines on the disk. 7 
No tentacle scales; spines on the disk. 
Åmphiocnida pilosa (Lym.) 
3. Two tentacle scales in the whole arm length. 4 
Only a few of the proximal joints with two tentacle scales, 
farther out only one; arms very long; 7—6 armspines. 
Amphiura aster Farquhar. 
4. Oral side of disk naked; 4 armspines. 
Amphiura norae Benham. 
Oral side of disk completely covered with scales. 5 
5. Spines (6—7) distinctly flattened. 
Amphiura amokuræ Mrtsn. 
Spines not flattened. 6 
6. Oral shields spearhead-shaped, distinctly longer than wide; 
radial shields very small. Amphiura eugeniæ Ljungm. 
var. latisquama Mrtsn. 
Oral shields rounded, about as wide as long; radial shields 
rather long. Amphiura rosea Farquhar. 
7. Oral side of disk naked. Amphiuræ hinemoæ Mrtsn. 
Oral side of disk completely covered with scales. 8 
8. Lowermost spine on the middle part of the arm much 
elongated and slightly curved, downwards directed. 9 
Lowermost spine not much elongated. 10 
9. Viviparous, hermaphroditic; armspines rather coarse. 
Amphiura magellanica Ljungm. 
Not viviparous; sexes separate; armspines rather delicate. 
Amphiura spinipes Mrtsn. 
10. Tentacle scale small, triangular. 11 
Tentacle scale large, leafshaped. 12 
11 * 
