18 



BULLETIN OF THE 



AMPHIURA. 



TABLE OF SPECIES HEREIN DESCRIBED. 



Disk distinctly 

 ' scaled on both 

 sides. 



^ • 



Two 

 scales. 



tentacle- 



Radial shields 

 narrow, about J 

 three times i 

 long as wide. 



One 

 scale. 



tentacle- 



Disk-scales swollen, humpy, and irregu-' 

 lar. Ten stout, sharp arm-spines. Biisjil 

 mouth-papilla; wide and scale-like. Ten- )■ maxima. 

 tacle scales very large, one overlapping the 

 other. 



Four straight, tapering "l 

 arm-spines. Disk-.scales (kg,;,-, 

 delicate. Upper arm-plates f 

 thin. J 



Radial shields small and "j 

 nearly or quite separated. 

 Seven or eight short,!, 

 blunt, crowded, thick [ '«<^«"«' 

 arm-spines. Outer mouth- 

 papilla scale-like. j 



Radial shields very small, broad, about^ 

 twice as long as wide. Five or six short, ( 

 conical, barred spines. Upper arm-plates t 

 narrow and rounded. ) 



Radial shields broad, about twice as long ^ 

 as wide. Three or four short, moderately | 

 stout arm-spines. Tentacle-scale minute. )■ acacia. 

 Radial shields and upper arm-plates wider 

 than in A. Slimpsoni. J 



( Six short, stout arm-^ 

 spines. Disk-scales fine. | constricta. 

 Radial shields Upper arm-plates narrow. ) 

 narrow, about! j-Qup lo^g, cylindrical! 



- arsentea. 



thrice as 

 as wide. 



long 



No 

 scale. 



Two (sometimes 

 one) minute tcn- 



arm-spines, the uppermost 

 and lowest longest. Ten- 

 tacle - scale large 

 rounded, 

 tentacle- ( Four tapering, equal arm-spines. 

 I scales rather large and spaced. 



and 



Disk- 



► iris. 



tomentosa. 



Under I 

 Outer 



Disk below naked 

 or with rudimen- 

 tary scales. 



Five slender, tapering arm-spines. 

 ' arm-plates squarish shield-shaped, v/uitfi (. idnceolata 



mouth-papilla spiniform. Upper arm-plates j 

 j narrow. 



j dial shields long 

 and narrow, 



^ Five tapering arm-spines. 

 One well-mark- ! wide, 

 cd tentacle-scale. ] 



Mouth-shields 1 



'labra. 



Three mouth-papillaj 

 on each side. 



Four or five tapering cylindrical arm- ) annularis 

 (. spines. Mouth-shields rounded. ) " 



No tentacle- ( Radial shield pear-seed shape. Four to ) ^j^^^^f^. 

 scale. I five .small, widely-spaced arm-spines. ) 



Two tentacle-scales. Four arm-spines. Inner mouth-papillae ^ 

 thick ; two outer small and sharp. Radial shields narrow and J concolor. 



separated. 



Four mouth-papillae 

 on each side. 



One 

 scale. 



No 



sides. 



tentacle- 



Three 

 spines, 

 middle 

 swelled. 



arm- 

 the 

 one 



Disk-scales fine ; only ■\ 

 central primary plate con- (^„ig„ 

 spicuous. First — '"~ '' 

 arm-plate small. 



Disk-scales coar 



under y 



primary plates conspicu- ( 



ous. First under arm-plate 

 wide and large. ) 



Four arm-spines. Disk naked below. "\ 

 Tentacle-scale minute and like a lip Ra- Lgiauca. 

 dial shields long and narrow, diverging C^ 

 inward. y 



tentacle-.«cale. Four arm-spines. Disk scaled on both J 

 Radial shields large, wide, and joined for half their \ Verrilli. 



Five mouth-papillsB 

 on each side. 



( length. Primary plates conspicuous. ) 



Two tentacle-scales. Three middle mouth-papillse longest. \ 



Point of mouth-angle occupied by lowest tooth. ) 



One tent-vcle-scale. Mouth-papillsE squarish and crowded. ^ 



Side mouth-shields large and wide. Disk-scales irregular, \ 



>. small, and crowded. 



Disk-scales irregular, Vpatttla. 



