RECENT OPHIURANS. 231 



decreases steadily in size and is wholly wanting on the distal part of the arm. 

 Color (dried from alcohol) : — disk, pale gray, the primary plates and radial 

 shields somewhat darker; arms and oral surface of disk, pale cream-color or 

 dirty whitish; upper arm-plates variegated with dull purple (hence the name). 



HoLOTTPB (M. C. Z. 3548). Victoria: Westeenport, 2-5 fms. J. Gabriel 

 coU. 1911. 



The coloration of the arms in this species is so unusual for an Amphiura 

 that it attracts immediate attention; possibly it is even more striking in the 

 Uving animal. The arm-spines and the adoral plates also furnish conspicuous 

 diagnostic marks. This is only one of many interesting echinoderms which 

 Mr. Gabriel has sent to the Museum, as a result of his enthusiastic interest in 

 the marine fauna of Victoria. 



490. A. ROSEA F.uiquhab, 1893. Trans. N. Z. inst., 26, p. 110, pi. 9. 



1 specimen. New Zealand: Foveaux Strait. 



491. A. SAESI Ljungman, 1871. Ofv. Kongl. vet.-akad. Forh., 28, p. 630. Plate 5, f. 8, 9. 



1 coTYPE. Azores: off San Miguel, 320-600 fms. 



492. A. SEMIERMIS L™an, 1869. Bull. M. C. Z., 1, p. 332. 1875. Illus. oat. M. C. Z., no. 8, 



pt. 2, pi. 5, f. 64. 



2 specimens. Gulf of Mexico, 539 fms. (Holotype missing). 



493. A. SEPTEMSPINOSA, sp. nov. Plate 4, f. 13, 14. 



Disk 2 mm. in diameter; arms 8-10 mm. long. Disk covered by a coat of 

 fine scales, among which the central plate is easily seen but the other primaries 

 are scarcely to be detected. Radial shields very small, three times as long as 

 wide, somewhat divergent, distally in contact. Upper arm-plates somewhat 

 bell-shaped, about as long as wide, much wider proximally than distally, more or 

 less in contact. Interbrachial areas below finely scaled. Oral shields wider than 

 long, broadly oval. Adoral plates rather large, nearly meeting both interradiaUy, 

 and radially. Oral papillae typical; subdental, moderate, squarish; distal, very 

 large, erect, spatulate. Under arm-plates squarish, rather longer than broad, 

 more or less fully in contact. Side arm-plates small, but carrying series of 6-7 

 (hence the name), subequal somewhat flattened, acute arm-spines, widened 

 basally, longer than an arm-joint. Tentacle-scale, single, oval, small. Color 

 (dried from alcohol), whitish, with faint bands on the upper side of the arms. 



Holotype (M. C. Z. 3737). Torres Strait: Murray Islands, Mer, south- 

 west reef. Oct. 23, 1913. Carnegie Exp. 1913. H. L. Clark coll. 



