REPORT ON THE CRINOIDEA. 219 



ends are more or less twisted round the bases of the cirri. The relations of the two 

 forms are thus somewhat closer than those of Ophiolebes scorteus with Antedon hirsuta, 

 which were noticed on p. 189; and the symmetrical arrangement of the large primary 

 plates on the Ophiurid disk, together with the position of its arms, gives a very singular 

 appearance to the centro-dorsal of the Comatula. 



5. Antedon patula, n. sp. (PI. XLIIL). 

 Specific formula — A. 2.^. 



Centro-dorsal subcorneal and flattened at the apex, with short and broad interradial 

 processes at its ventral angles. Five double rows of cirrus-sockets, three or four in each 

 row. About thirty cirri, of some twenty stout and smooth joints, most of which are 

 longer than wide, and somewhat compressed laterally, so as to have a sharp dorsal edge. 

 The first radials invisible ; the second short, closely united laterally and almost V-shaped 

 in side view. Axillaries widely rhombic, with a large and rounded backward projection 

 which is more or less tubercular in character. The rays divide twice, forming twenty 

 arms of about one hundred and sixty joints. Two distichals, the axillary without a 

 syzygy. The radial axillaries, the distichals, and the first three or four brachials have 

 sharp lateral edges and flattened sides. The surfaces of the distichals, and of the lowest 

 brachials rise to a more or less distinct tubercular projection. The fourth and following 

 brachials are short and nearly oblong, their surfaces rising considerably from the proximal 

 to the distal margins, which stand up rather prominently. Beyond the fifteenth brachial 

 the joints are more triangular, with a median ridge, and overlap slightly. A syzygy in 

 the third and then not till the eighteenth or twentieth brachial ; others at intervals of 

 four to eight, usually six or seven, joints. 



The first pinnule is some 8 mm. long, and consists of about twenty-five short joints, 

 the lowest of which are broad and rather sharply flattened. The next pinnule is a 

 trifle longer and stouter, with a smaller number of larger joints, and in the next 

 following pinnules the joints gradually increase in size and become more carinate, the 

 third to the fifth being the widest, but they do not become longer than wide till some 

 way out on the arm. 



Disk thickly plated, and also the arms, both along the ambulacra and in the inter- 

 muscular spaces. The genital pinnules have a covering of small plates, with the sacculi 

 scattered upon them, and the ambulacra of the later pinnules have well differentiated 

 side plates with intervening sacculi. 



Colour in spirit, — the skeleton whitish-brown, and the disk darker. 



Disk 10 mm.; spread about 35 cm. 



Locality.— Station 192, September 26, 1874 ; near the Ki Islands ; lat. 5° 49' 15" S., 

 long. 132° 14' 15" E.; 140 fathoms; blue mud. Two specimens. 



