194 
ambulacral plates are included within the subanal fasciole, the first 
of them being no. 6. 
Pedicellariæ are very scarce in the two specimens, only a few 
rostrate and some small tridentate forms being found, the latter 
being of the simple, leafshaped type. No characters of specific 
value are afforded by these pedicellarice. 
That this species cannot be identified with Br. luzonica, which 
is recorded in the „Challenger" Echinoidea as taken o ff New Zea¬ 
land (St. 168, 40° 28’ S. 177° 43’ S., 1100 fms) 1 ), is beyond doubt, 
partly on account of the shape of the petals, partly because the shape 
Fig. 23. Peristome, labrum, and adjoining ambulacral plates of Brissopsis 
zelandiæ (a; and Br. luzonica (b.). 5,6/1. 
of the labrum is different it being distinctly less prominent in luzonica 
and generally somewhat concave at the anterior border (Fig. 23), 
also the mouth is rather sunken in the present species, while in luzo¬ 
nica the mouth-region is almost flush with the test. From Br. Oldhami 
it likewise differs in the shape of the petals, and further the number 
of plates included within the subanal fasciole is different, 4 in Oldhami, 
5 in the present species. Here is, however, a questionable point. In 
my „Ingolf" Echinoidea II. p 168 I have stated Br. Oldhami to have 
five ambulacral plates reaching within the subanal fasciole, while 
Koehler 2 ) asserts that only four plates are crossed by the fasciole 
1) These specimens need reexamination in the light of the more recent 
researches on the Brissopsis- species. The great depth at which they 
were found is not in favour of their being identical with either the true 
luzonica (which, according to the researches of Koehler, appears to be 
mainly a shallow-water form) or the present species. 
2 ) r Koehler. An Account of the Echinoidea. I. Spatangidés. Echino* 
deima of the Indian Museum. Part VIII. Calcutta. 1914. p 226. 
