ACANTHOCIDARIS HiVSTIGERA. 41 



When dried the secondary and miliary spines arc of a uniform brown, 

 chocolate color. The primary spines are of a lighter color with a pinkish 

 tinge, the basal part of the spine yellowish, or sometimes porcelain white 

 in smaller specimens. 



Although the tridentate and small globiferous pedicellariaj are present 

 always, the large globiferous may be wholly wanting in large specimens. 



The large globiferous pedicellarias (PI. 11, fig. l) are not essentially 

 different from the small ones, but often have the lip incomplete and the 

 end-tooth is wanting. There are numerous calcareous ridges and elevations 

 on the inner face of the valve, which measures about .80 mm. in lengrth. 

 The stalk (PL 12, fig. i) is about as long and has a well-developed limb. 

 These pedicellarise are infrequent and apparently most common in young 

 specimens. 



The tridentate pedicellarise (PL 11, figs. ^,5) have long stout valves, with 

 longitudinal ridges on the inner face. The valves are as much as 1.55 mm. 

 in length and the stalk is about the same. They occur mainly on the 

 actinal surface. 



The small globiferous pedicellariae (PL 11, figs. 2,3) have straight sides 

 and a well-developed end-tooth, which is less conspicuous in large valves. 

 They range in size from .20 mm. upwards, in length of valve, with stalks 

 1-3 times as long, and intergrade with the large globiferous ones, so that 

 it is hard to draw any line between the two. They are abundant 

 everywhere. 



Although similar in its general appearance to Bell's species [Cidaris cur- 

 vatispinis) from Mauritius, hastigera difi^ers so strikingly in color, as well as 

 in the form of the basal half of the primaries, that the two cannot be 

 identical. 



This species has been collected at the following stations in the Hawaiian 

 Islands. 



Station 3823. Off Lae-o Ka Laau Light, S. coast of Molokai. Bott. 

 temp. 69^ 78-222 fathoms. Fne. s. p. 



Station 3838. Off Lae-o Ka Laau Light, S. coast of Molokai. Bott. 

 temp. 67°. 92-212 fathoms. Fne. gy. br. s. 



Station 3845. Off Lae-o Ka Laau Light, S. coast of Molokai. Bott. 

 temp. 71°. 60-64 fathoms. Crs. s. p. sh. 



Station 3846. Off' Lae-o Ka Laau Light, S. coast of Molokai. Bott. 

 temp. 71.5°. 60-64 fathoms. Crs. br. s. sh. g. 



