236 RECENT OPHIURANS. 



Amphiocnida. 



Verrill, 1899. . Trans. Conn, acad., 10, p. 307, 316. 

 Type-species: Ophiocnida pulnami Lyman, 1871. lUus. cat. M. C. Z., no. 6, p. 11. Type designated. 



568. A. BRACHIATA (Montagu). 



Asterias brachiata Montagu, 1804. Trans. Linn, soc, 7, p. 84. Bell, 1892. Cat. Brit. Eoh. 



Brit, mus., pi. 18, f. 3-5 (as Ophiocnida brachiata). 

 Amphiocnida brachiata Verrill, 1899. Trans. Conn, acad., 10, p. 318. 



7 specimens. England: Devonshire, Salcombe. France: Arcachon; 

 "Cape Breton" (some point on the coast of Bretagne is probably meant). 

 Algeria. Naples. 



569. A. DILATATA (Koehlee). 



Ophiocnida dilatata Koehler, 1905. Siboga-exp. Oph. litt., p. 30, pi. 12; f. 2^. 



1 specimen. Torres Strait: Mm-ray Islands, Mer. 



570. A. INEQUALIS, sp. nov. Plate 9, f . 5, 6. 



Disk 10 mm. in diameter; arms all broken but evidently about 100 mm. long, 

 and possibly even more. Disk more or less puffed, covered with numerous very 

 fine scales, many of which bear, each, a slender spinelet; but the covering of 

 spinelets as a whole is sparse. Radial shields about 2 mm. long and .7 mm. 

 wide, slightly curved, very close together, and distally in contact. Upper arm- 

 plates elliptical, at first as long as broad, or longer, but soon becoming much wider 

 than long, more or less in contact. Interbrachial spaces below with scattered, 

 minute plates bearing spinelets. Oral shields (except madreporite) , shield- 

 shaped, about as long as broad; madreporite conspicuous broadly oval, widest 

 just proximal to middle. Adoral plates very small, distinguishable only with 

 difficulty. Oral papillae, 2 on each side; proximal or subdental papillae, large 

 and thick; distal papillae, stout, thick and erect. Under arm-plates squarish; 

 distal margin concave or notched ; at first longer than broad but becoming some- 

 what broader than long. Side arm-plates moderate, each bearing a series of 

 6 or 7 (rapidly decreasing to 5) very unequal arm-spines (hence the name); 

 the lowest spine is longest and is flat and blunt; it about equals a joint and a 

 half; the uppermost spine is similar but shorter; the middle (3 and 4) spines 

 are the smallest and do not equal the arm-joint; they are also the narrowest 

 and least flattened; the inequality of size is marked only near base of arm and 

 is scarcely noticeable near tip. Tentacle-scales none. Color (dried from 

 alcohol), pale brownish. 



