320 HAWAIIAN AND OTHER PACIFIC ECHINI. 



although the two of a pair are placed side by side, the pairs themselves are well 

 separated from each other. Each plate carries a tube-foot. The spines are 

 slender, rather blunt, and perfectly smooth. The small ones may end with a 

 distinct central point, and some at least are slightly swollen at the tip. 



The pedicellarise are very much like those of siamensis. The globiferous are 

 fairly common; the valves measure about .16 mm. in length. The ophicephalous 

 are abundant and quite variable in size, the valves ranging from .13 to .19 mm. 

 besides the loop. In the larger ones, the valves are relatively longer and have a 

 more sinuate margin than Mortensen figures for siamensis. No tridentate 

 pedicellarise were found. The triphyllous seem to be rare and the valves are 

 only .10 mm. in length. Neither spicules nor sphseridia were noted. 



The color of the test is prevailingly green, with the abactinal interambulacra 

 lighter and often pure white in striking contrast. The primary spines are 

 whitish with more or less red. The tendency towards a bright red coloration 

 is noticeable and two specimens are almost uniformly bright red, test as well as 

 spines. Around the actinostome the test often becomes whitish, while abactinally 

 it is frequently marked with purplish brown. While the color is thus very 

 variable, there is no tendencj r to approach that of siamensis, except that each 

 species has a bright red variety. 



Although this species appears to be very near siamensis, comparison of 

 specimens of the same size reveals some important differences. The primary 

 spines are noticeably longer and more slender and are not banded, in hawaiiensis, 

 while the test is relatively higher and the suranal is smaller. We do not find 

 any trace of a membrane surrounding the pits, as Mortensen figures for siamensis. 

 The characters by which hawaiiensis is distinguished from maculata are given 

 in the table above. It seems probable that with a specimen of maculata at hand 

 for comparison, other and weightier differences might be found, for with only 

 the published description and figures of maculata, some important points may 

 have been overlooked. 



The "Albatross" took hawaiiensis at the following stations: 



Station 3823. Off Lae-o Ka Laau Light, Molokai, Hawaiian Islands. Bott. 

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



Station 3847. Off Lae-o Ka Laau Light, Molokai, H. I. Bott. temp. ? 

 23-24 fathoms. S., st. 



Station 3871. Off Mokuhooniki Islet, Auau Channel, H. I. Bott. temp. 

 74.6? 13-43 fathoms. Fne. wh. s. 



Station 3872. Off Mokuhooniki Islet, Auau Channel, H. I. Bott. temp. 

 74.6. 32-43 fathoms. Yl. s., p., co. 



