REPORT ON THE CRINOIDEA. 109 



individual obtained. This shows much more of the first radials externally than is 

 visible in the adult (PL XII. fig. 4 ; PL XV. fig. 1); while the pinnule on the third 

 brachial shows hardly any trace of the enlarged and carinate basal joints which appear in 

 the adult, but is more like its successor as in the group of species next to be described. 



5. Antedon lusitanica, n. sp. (PL XXXIX figs. 1-3). 



Specific formula — A.(2).— . 



1884. Antedon lusitanica, P. H. Carpenter, Proc. Roy. Soc. Edin., 1884, vol. xii. p. 368. 



Centro-dorsal hemispherical, roughened at the dorsal pole, and bearing twelve or 

 fifteen slender cirri. These reach nearly 30 mm. and consist of about fifty joints, of 

 which the fifth to the fifteenth are longer than wide. The following ones have a sharp 

 dorsal spine which is smaller again in the terminal joints. 



First radials scarcely visible ; the second relatively short and trapezoidal, with traces 

 of a median ridge which is continued on to the axillaries. These are short, wide, and 

 pentagonal, with a slight backward projection in the middle of the proximal edge. The 

 axillaries and the first two brachials have sharp straight edges and flattened sides. 



The second and the hypozygals are also sometimes flattened on their inner sides. 

 First brachials not much incised, and the outer portions of their dorsal surface are usually 

 much less convex than the remainder. 



Ten arms, of smooth elou gated joints ; but in one individual there are two series of 

 two distichals each, the axillaries not syzygies. The third and the fourteenth or fifteenth 

 brachials are syzygial joints. 



First pinnule considerably larger than the second ; its lower joints stout and wide, 

 with the outer sides somewhat flattened. The second and the three or four next joints 

 have their inner edges produced into strong keels which are slightly folded upwards. 

 The following pinnules are quite small and increase but slowly in length. 



Disk 5 mm. in diameter, thickly covered with numerous small plates, those at the 

 sides of the ambulacra being rather more regularly arranged than the rest. 



Pinnule-ambulacra not well defined, but the sacculi moderately developed. 



Colour in spirit, — brownish-white or greenish- white. 



Disk 5 mm.; spread probably about 12 cm. 



Locality.— H.M.S. "Porcupine," 1870, Station 17a; lat. 39° 39' N., long. 9° 39' W.; 

 730 fathoms : bottom temperature, 49°-3 F. Ten mutilated specimens. 



Remarks. — This is a peculiar species in many ways, and it is very unfortunate that 

 the ten individuals obtained by the "Porcupine" should have all been so mutilated, the 

 arms, except in two specimens, having broken away at the syzygy in the third brachials. 

 These two individuals are shown in PL XXXIX. figs. 1, 3. One is a ten-armed form 



