CLARK: CRINOIDS. 243 



long as wide, or even a little more, in the outer third of the pinnule), then short 

 again on the terminal segments ; second pinnule 15 mm. long, much stouter than 

 the first, stiff, composed of fifteen segments, the first three squarish, then rapidly 

 becoming elongated, reaching a maximum length (on the eleventh or twelfth) of 

 somewhat over three times the width ; third and following pinnules much shorter 

 than the first (5 mm.), with twelve to fifteen segments, becoming gradually longer 

 and more slender distally, where they are 9 mm. long. The first distichals, first 

 palmars, and first brachials are united basally, but free distally ; the axillaries and 

 second and following brachials are widely free. In one arm of the type both the 

 first and second brachials contain syzygies, and both bear pinnules. 



Color (in spirits) grayish brown. 



Type Cat. 290 M. C. Z. from Ebon, Marshall Islands, collected by Rev. 

 B. G. Snow. 



Himerometra persica sp. nov. 



Centro-dorsal low-hemispherical, bearing about twenty-five cirri, a large area at 

 the pole free ; cirri 27 mm. long with thirty-five segments, mostly slightly longer 

 than wide, becoming squarisb distally, the last sixteen to eighteen bearing sharp 

 dorsal spines ; radials just visible ; first costals trapezoidal, about three times as 

 broad as long, axillaries pentagonal, about once and a half as broad as long, with 

 a sharp anterior angle ; costals rounded and widely free; distichals 4 (3+4) or 

 2 ; twenty to twenty-five arms 150 mm. long, the first eight brachials roughly 

 oblong, then quadrate (much broader than long), becoming oblong toward the 

 ends of the arms ; a syzygy in the third brachial, another at about the seven- 

 teenth, and others distally at intervals of five to twelve (usually about seven) ; 

 distichal pinnule 13 mm. long with thirty-six segments, all somewhat longer than 

 wide, but not much so ; the pinnule is very slender and flagellate, the first four 

 segments being the broadest, and being slightly carinate ; first brachial pinnule 

 similar, but longer (16 mm.) and stouter basally, the five or six proximal 

 segments sharply carinate, the pinnule then tapering gradually to the long 

 delicate flagellate tip; the next pinnule is the same as that on the second 

 brachial, and of the same length; the next few pinnules decrease rapidly in 

 length, then increase somewhat distally, but do not become very long; the 

 carination of the basal pinnule segments becomes less and less marked, and is 

 not noticeable after the sixth ; it is at its maximum on the pinnules of the second 

 and fourth brachials. 



Color (in spirits) dull brown, the skeleton somewhat lighter. 



Types Cat. 291 M. C Z. from the Persian Gulf, collected by F. W. Townsend. 



This species is not very nearly related to any of the other species of Himero- 

 metra ; according to the key given by Hartlaub for the " Savignyi Group " it 

 would fall with H, crassipinna ; but the slender and flagellate lower pinnules 

 serve at once to distinguish it. 



