46 HAWAIIAN AND OTHER PACIFIC ECHINI. 



The pedicellariae are not very common but are rather characteristic. The 

 ophicephalous have heads .30-35 mm. long; the blade (PI. 124, fig. 9) has 

 coarsely serrate margins; the loops differ very much on the three valves (PI. 

 124, figs. 10-12). The tridentate have slender, bent valves (PL 124, figs. 7, 8) 

 about .40 mm. long. The miliary spines examined by me had square-cut tips, 

 not sloping as figured by de Meijere, but this may be a matter of the place on 

 the test, whence the spine is taken. 



The Albatross brought home three bleached bare tests of this species, 

 collected at Wotje, Marshall Islands, 22 January, 1900. 



Laganum decagonale. 



Scutella decagonalis de Blainville, 1827. Diet. Sci. Nat., 48. p. 229 

 Peronella decagonalis A. Agassiz, 1872. Rev. Ech., pt. 1, p. 148. 

 Laganum decagonale Bell, 1884. Alert Ech., p. 122. 



The exact geographical range of this species is uncertain owing to its having 

 been confused with others. Specimens are in the M. C. Z. collection from the 

 Arafura Sea (Challenger coll.), the Philippine Islands, and "Durban, Natal." 

 The last was purchased from a European dealer and the locality cannot be 

 considered as unimpeachable, although there is no obvious reason for question- 

 ing it. 



Laganum fudsiyama. 



Doderlein, 1885. Arch. f. Naturg., 51. 1. p. 104. 



Plates 124, figs. 13-16; 127, figs. 7, 8; 140, figs. 3, 4; 141, figs. 4-9. 



The large series of Laganum collected by the Albatross has proven a 

 source of much interesting study, but no little perplexity, owing to the great 

 diversity shown in the height of the test and in the number of genital p 

 The conclusion was finally reached that the former is a very variable and unim- 

 portant character while the latter is a very constant and useful one. Dr. Doder- 

 lein has been so good as to send me authentic specimens of fudsiyama from 

 Japan, so I have no doubt as to the authenticity of my Japanese specimens. 

 These specimens range in length from 50 to 71 mm., while those from the 

 Hawaiian Islands range from 8 to 50. The latter are as a rule much higher 

 than the former but owing to the absence of small specimens from Japan, I can- 

 not decide whether the height is a youthful character or not. So far as I can 

 see de Meijere's L. conicum is identical with fudsiyama and apparently his /.. 



