Clark — New Genera and Species of Crinoids. 229 



Family TROPIOMETRIDJE. 

 Genus ASTEROMETRA A. II. Clark. 

 Asterometra lepida sp. nov. 



Centro-dorsal rounded-conical, about as long as broad at the base, the 

 cirrus sockets arranged in ten crowded, but regular, columns, of usually 

 two each, two columns to each radial area. 



Cirri lacking, but, as the centro-dorsal and the cirrus sockets are pro- 

 portionately smaller than in the three other species of the genus, it may 

 be inferred that the cirri are either shorter, or more slender, or both. 



Disk lacking; brachial and pinnule ambulacra protected by large cov- 

 ering plates as in the other species of the genus. 



Radials short, about four times as broad as long, with a prominent 

 tubercle in the median line; first costals oblong, approximately three 

 times as broad as long; costal axillaries broadly pentagonal, not quite 

 twice as broad as long; distichals 2, as in A. mdcropoda and A. anthus. 

 Eleven arms (in the type) 70mm. long, resembling those of the other 

 species of the genus, but somewhat more slender basally. 



Pj 5.5mm. long, styliform, with ten joints, the first not quite so long as 

 broad, the second slightly longer than broad, the third and following 

 slightly longer than the second; P 2 0.5mm. long, with twelve joints, 

 resembling P 1; and of the same diameter basally though, on account of 

 its greater length, tapering more gradually; P 3 similar to P 2 , with the 

 same number of joints, but somewhat stouter; following pinnules gradu- 

 ally increasing in length and in number of joints, the joints in the termi- 

 nal portion becoming proportionately more elongated; P 10 is 9mm. long, 

 and the distal pinnules are li'mni. long, with fifteen to seventeen joints, 

 of which the first is about twice as broad as long, the second is squarish, 

 the third about one-third longer than broad, and the following increasing 

 wry gradually in length, being distally about three times as long as broad. 



Color (in spirits). — Brownish white. 



Type locality.— Straits of Formosa; :!•"> fathoms. 



Type, in the collection of the University of Copenhagen. 



Family ANTEDONID.E. 

 Mastigometra gen. nov. 



Genotype. — Mastigometra flagellij 'era sp. nov. 



Centro-dorsal hemispherical; cirri resembling those of Antedon, but 

 much more numerous; arm structure as in Antedon; lower pinnules 

 greatly elongated and exceedingly slender distally, \\ twice as long as the 

 cirri, P 3 and following pinnules about as long as the cirri. 



Mastigometra flagellifera (Liitken MS.) sp. nov. 

 Centro-dorsal hemispherical, a rather small convex polar area bare. 

 Cirri i.-lxxx, 15, about 12mm. long; first two joints short, about 

 twice as broad as long; third about one-third again as long as broad; 



