CLENOPEDINA HAWAIIENSIS. 217 



careful comparison of these specimens with de Meijere's description and figures 

 shows that they are really quite a distinct species, which may be called 

 hawaiiensis. It is interesting and important to note in this connection that, so 

 far as can be judged from de Meijere's description and figures, indica appears 

 nearer cubcnsis, than to any other species. Indeed the differences between the 

 two, which de Meijere mentions are for the most part trivial, but it is possible 

 that a direct comparison of specimens would show more important distinctions 

 than those given below. The fifth species of the genus, from the Hawaiian 

 Islands, is strikingly different from any of the others and because of its fine 

 coloring well deserves its name, pulchella. 



The following table shows the characters by which the five species may be 

 distinguished. 



Anal system covered by numerous minute plates; primary spines long and slender, more 



or less cylindrical, thickness less than .05 of length. 

 Primary spines not banded; genital plates with very few spines or at least, bare at 



the centre. 

 Abactinal region not at all violet; genital plates, each with several secondary and 



rather numerous miliary tubercles. 



Actinostome distinctly smaller than periproct; few, scattered secondary 

 tubercles in ambulacra; tridentate pedicellarias common; usually more 



or less greenish abactinally cubensis. 



Actinostome equals periproct; a double row of secondary tubercles in each 

 ambulacrum; tridentate pedicellariie seem to be wanting; no green in 



coloration indica. 



Abactinal region distinctly violet; genital plates quite bare, each with about 

 8 tubercles chiefly on proximal margin; tridentate pedicellariae abundant and 

 varied; ophicephalous pedicellariao with markedly constricted valves, wanting hawaiiensis. 

 Primary spines greenish or very light brown with several broad ill-defined bands of red 



or reddish brown; genital plates with more or less numerous secondaries . . . mirabilis. 

 Anal system covered by few (15-30) plates; primary spines short and stout, tapering to a 



blunt point, thickness nearly .10 of length pulchella. 



Caenopedina hawaiiensis, nom. nov. 



Hemipedina indica A. Agassiz and Clark, 1907, Bull. M. C. Z., L, p. 245. NON Hemipedina 

 indica de Meijere 1903, Tijds. Ned. Dierk. Vereen., (2), VIII, p. 3. 



Plates 90, figs. 1-4; 91, figs. 1-13; 105, figs. 1-5. 



The largest of the specimens measures 37 mm. in diameter and the height of 

 the test is 17 mm. There are 10 interambulacral plates in each column and 15 

 ambulacral plates in each half-area. The longest primary is 41 mm. in length. 

 In another specimen, 32 mm. in diameter the longest primary is 50 mm. long 



