NO. 1691. SEVENTEEN NEW SPECIES OF CRIN0ID8— CLARK. 649 



Ten arms, all broken off at the base in the two specimens at hand ; 

 first brachial slightly Avedge-shaped, about twice as broad as its ex- 

 terior length, entirely free interiorly; second brachial considerably 

 larger, approximately oblong, not quite so long as broad; third and 

 fourth brachials (syzygial pair) not quite so long as broad; the re- 

 mainder of the arms and the pinnules, so far as can be judged from 

 the fragments, are similar to those in other species of the genus. The 

 synarthrial tubercles are very slightly marked. 



Type-specimen. — Cat. No. 9G=^V-^, Indian Museum; hit. 11° 

 31' 40" K, long. 92° 4G' 40'' E.; 188-220 fathoms. 



Ootype.—Csit. No. 25485, U.S.N.M. ; from the same locality. 



Genus MASTIGOMETRA A. H. Clark. 



MASTIGOMETRA MICROPODA, new species. 



Centro-dorsal low hemispherical, 4 mm. in diameter at the base, 

 the polar area slightlj^ convex or flattened ; cirrus sockets closely 

 crowded, very numerous, in four or five alternating rows. 



Cirri L-XC, 10, about 10 nnn.^long; first two joints short, rather 

 over twice as broad as long, third as long as broad to about one-third 

 longer than broad, fourth and fifth slightly longer; succeeding joints 

 subequal, about as long as broad; third to sixth joints slightly " dice- 

 box shaped," the remainder with the ventral surface practically 

 straight and the dorsal with a slight median concavity (in lateral 

 view) ; no trace of dorsal spines or overlap; cirri becoming somewhat 

 compressed in the distal two-thirds, and therefore appearing very 

 slightly broader in lateral view ; opposing spine represented by a 

 slight tubercle, terminally situated, which may be obsolete. 



Scattered calcareous granules are present along the disk ambulacra, 

 and single interradial plates may be present between the IBr^. 



Radials even with the edge of the centro-dorsal; IBr^ very short, 

 five or six times as broad as long, of uniform height, not quite 

 in apposition basally, the lateral edges diverging distally; IBrj 

 (axillary) triangular, about half again as broad as long, the anterior 

 angle somewhat produced, the proximal border as long as the proxi- 

 mal edge of the IBrj. 



Ten arms, probably about 80 mm, long, their structure being the 

 same as in M. flageUlfera. The distal intersyzygial interval is three 

 oblique muscular articulations. 



Pj 15 mm. long, much stouter basally than the succeeding, though 

 tapering to an exceedingly slender and delicate flagellate tip ; Po 

 9 mm. long; following pinnules gradually decreasing in length. The 

 pinnules are of the same proportions and structure as are those of 

 M. ffagellifera. 



Type-specimen. — Cat. No. 14 H., Indian Museum; " ?India." 



Cotype.—Csit No. 25486, U.S.N.M.; " ?India." 



