224 SMITHSONIAX MISCELLANEOUS COLLECTIOXS VOL. 52 



CALOMETRA ACANTHASTER, new species 



This new form comes nearest to C. iiittlticolor, of Japan, but it 

 differs from that species in a number of characters which appear to 

 be perfectly constant. The arms are thirty in number instead of 

 twenty or less, palmar series (2) being developed on the outer side 

 of each distichal series in 2, i, i, 2 order; the third pinnule is as 

 large as and resembles the second instead of being considerably 

 smaller, as in C. nnilticolor; the cirri, while containing the same 

 number of joints, are very different in appearance from those of C. 

 nnilticolor; in the latter the joints in the distal half of the cirri are 

 rounded ventrall}-, the distal ventral ends are even with the proximal 

 ventral ends of the succeeding joints, the width is about twice the 

 length in the middle lateral line, and the dorsal spines arise from one- 

 half or rather less of the dorsal surface and are small and pointed ; 

 in C. acanthaster the distal half of the cirri is sharply carinate ven- 

 trally, and the distal ends of the joints are prominent, overlapping 

 the bases of the succeeding joints ; the joints themselves are broader, 

 being about three times as broad as long in the lateral line, and the 

 dorsal spines, which arise from the entire dorsal surface of the 

 joints, are high, and terminate in a long ridge parallel to the median 

 line of the joint instead of in a point. 



Measurements. — Arms 60 mm., cirri 20 mm. long. 



Color (in spirits). — Yellow, the cirri with a few narrow bands of 

 deep purple, and the pinnules with large, indistinct blotches of light 

 purplish ; or purple, the centro-dorsal, costals, and blotches on the 

 arms and pinnules white ; or white, the arms with about every third 

 brachial deep purple, the pinnules and cirri narrowly banded with 

 purple. 



Type. — Cat. No. 25446, U. S. N. M., from Albatross Station No. 

 5153; east of Port Dos Amigos, Tawi Tawi ; 49 fathoms. 



Genus PTILOMETRA A. H. Clark 



PTILOMETRA TRICHOPODA, new species 



Centro-dorsal columnar, the polar area a low truncated cone bear- 

 ing five rather long, rounded tubercles which are radial in position ; 

 cirrus sockets in ten columns, two in each radial area, usually two 

 cirrus sockets to a column. 



Cirri xx. 80-85 (i-isi^ially 84 or 85). very long and slender, tapering 

 gradually from a moderately stout base to a slender tip : first joint 

 short, second about twice as broad as long, the following graduallv 



