Belemnocrr ut two new species. 257 



thus suggesting the specific name. The upper faces of the first 

 radials are truncated, and upon their inner edges rest the free 

 radials which are four in number, about one-fourth the size of 

 the first radials, a little wider than high and of uniform dimen- 

 sions up to the arms. The plates of this series are rounded, 

 strongly constricted, transversely in the middle, expanding at 

 their upper faces, producing a rim which envelopes the lower 

 part of each succeeding piece, this rim or wrinkle being rather 

 thicker and more prominent at the lateral margins. The 

 fourth free radial is pentagonal in form, the two upper faces 

 forming an obtuse angle and supporting the arms which are 

 simple throughout their entire length, thus giving two anus to 

 each ray or ten to the species. Arms comparatively very long, 

 rounded, tapering very gradually to the tips, composed of joints 

 which are constricted' in the middle, marked by strong lateral 

 wrinkles, thickened at the upper margin to embrace the suc- 

 ceeding joints just as in the free radials. In the lower part of 

 the arms, apparently every third joint, is a syzygium, wedge- 

 form in shape, with quadrangular joints between ; while in the 

 upper part 1 ■nately wedge-form, and to the 



longer margins of these joints the pinnules are attached. These 

 >ints are strong, prominent, and give to the arms an 

 obtusely zigzag appearance. Pinnules simple, rather heavy, 

 very long, directed upward, lying closely along the arms, com- 

 posed of rectangular joints twice as long as wide, and of nearly 

 equal size throughout their length. Anal plate, rather large, 

 dine, its upper face in a line with the top of 

 the first radials. From the inner part of the upper truncate 

 face of this plate proceeds a proboscis, in height equal to three- 

 fourths the length of the arms. The lower part is composed of 

 large plates bo the free radiaU 



ft g upon the upper truncate face 

 of the preceding one. Proboscis the u PPf 



part composed of small nodose plates irregularly arranged, 

 while its summit is surmounted by a set of prominent spines 

 whose arrangement cannot be exactly determined. 



The entire surface, with the exception of the basal plates, 

 (even the pinnules) is covered by strong wrinkles which pro- 

 duce a peculiar earinated style of ornamentation. 



This species is so well marked, and so unlike any other de- 

 scribed form, that it may be ' S reatest 

 ease. It differs from B.typus and R "";;'; <' m its shorter 



aehmentof the first radials to the basals. In botn 



these species, the suture between * V ^flul 



lata form a continuation of he 



cylindrical basal portion, while in our species the depth of the 



