176 
ation by Hutton was correct. H. inflatus being apparen.ly .be 
only species of the group, the occurrence of wh.ch at New Zea an 
has been definitely settled, the suggestion l.es at hånd that this 
was the species mentioned by Hutton. There is nothtng tn he 
description either to disprove this suggestion. But, of course, e 
typespecimen should be reexamined in the light of the more recent 
researches on the Ambly pneustes-Holopneustes group, tn order to 
have the question definitely settled. 
13. Echinocyamus polyporus n. sp. 
PI. VI. Figs. 28—31. 
Fibularia australis. Ben ham .9.1, Stel.erids and Echinids from the 
Kermadec Isl. Trans. N. Z. Inst. XLIII. p. 1W. 
_ — Desmoulins. 
Non: 
Length. 
mm 
13,5 
13,5 
12 
10 
8 
Breadth. 
mm 
11,5 
12 
11 
9 
7 
Height. 
mm 
5 
5 
4 
4 
3 
Pairs of pores ia the petals 
anterior. anterolateral. postenor. 
19 
19 
19-20 
18-19 
16-17 
14 
18-19 
16 
15 
13 
18—19 
18-19 
16-17 
15—16 
14 
Test rather flattened. somewhat arched on the aboral side, 
generally dis.inctly concave on the oral side in the posterior parh 
the anterior part being somewhat raised. The penstome is d.st.nc y 
sunken. The periproct situated rather exactly in the m.ddle betwee 
the mouth and the posterior edge of the test; i. is rounded and 
of the same size as the peristome. The apical system ts central, 
the genital pores considerably larger than ocular pores, apparently 
of ahout the same size in bo.h sexes. The petals are very large 
reaching nearly the edge of the test; the pore-senes of each pe.a 
somewhat diverging in the outer part. Pores not conjugated, numb- 
ering 16—20 in fullgrown specimens. Tubercles unt orm, sma 
The internal interambulacral partitions are restricted to the very 
edge of the test, not radiating inwards (PI. VI, Ftg. 29). 
A few specimens of this interesting new species were given 
me by Captain Bollorrs, who dredged them in the Cooks Strait, 
n a depth of ca. 40 meters. Unfor.unately all are naked, some¬ 
what worn tests; 1 cannot, therefore, give any information about 
the structural characters of spines and pedicellanæ. The characters 
afforded by the test, especially the unusual size of the petals and 
the slight development of the internal partitions dectdedly disting- 
