AGASSIZ AND CLARK: REPORT ON ECHINI. 245 



TRIPLECHINIDAE A. Ag. 



Hemipedina indica de Meij. 



Hemipedina indica de Meijere, 1903. Tijds. Ned. Dierk. Vereen. (2) 8, p. 3. 



The small series of this Oriental species, taken by the " Albatross," is of par- 

 ticular interest from the large size of most of the specimens, which range from 15 

 to 37 mm. They agree well with de Meijere's description, even in coloration, 

 which shows little variation except in depth. The larger specimens have the test 

 more flattened than the young ones, and its color is distinctly purple, while the 

 actinostome is relatively smaller. It seems to us very unlikely that mirabile is a 

 synonym of indica, as Doderlein now supposes. 



Station 3865. Pailolo Channel, between Maui and Molokai, 256-283 fathoms. 

 3879. Off Molokini Islet, south of Lanai, 923-1081 fathoms. 

 " 3914. Off Diamond Head, Oahu, 289-292 fathoms. 

 " 4178. Off Kawahioa Point, Niihau, 319-378 fathoms. 

 " 4179. Off Kawahioa Point, Niihau, 378-426 fathoms. 

 Eleven specimens. 



Hemipedina pulchella A. Ag. and Clark. 



This beautiful little Echinoid may be recognized at once by the remarkable inter- 

 ambulacral primary radioles and the showy coloration. The test is white, becom- 

 ing rosy abactinally (the ocular and genital plates of the larger specimen are quite 

 red) ; the anal system is contrastingly white. The ambulacral primaries and the 

 very few secondary spines are pure white, while the interambulacral primaries are 

 bright yellowish-green at the base, pink in the middle, and whitish or pure white 

 at the tip ; the colors are not sharply separated, but shade into each other. The 

 primaries of the abactinal coronal plates are one and a half times as long as the 

 diameter of the test, or less ; they are very stout (the thickness 8-10 per cent of 

 the length) and closely resemble those of Echinometra. In the larger specimen the 

 test is 14 mm. in diameter, and the abactinal and actinal systems each about one 

 half as much. The anal system is remarkably small, decidedly smaller than a 

 single genital plate, and is covered by a few (20) rounded plates. The genital 

 opening is near the centre of the plate. 



Station 3991. Off Mokuaeae Islet, Kauai, 272-296 fathoms. 



Two specimens. 



Psammechinus verruculatus Ltk. 



Psammechinus verruculatus Liitken, 1864. Vid. Med., p. 166. 



All the specimens are small, the largest being 'only 12 mm. in diameter, but 

 they correspond well to de LorioPs (1883) figures and description, with the ex- 

 ception that the poriferous zones, on the bare test, are red or reddish, instead of 

 greenish. 



