144 
legitimate — the list is notably augmented; but there is no reason 
to enter on the New Zealand deep-sea fauna at the present oc- 
casion. _ . 
The region of the South Island is not especially rich in Echin- 
oids, and future researches can hardly be expected to yield many 
new’forms from there. Still less are we to expect noteworthy additions 
to the littoral or sublittoral Echinoid-fauna of the Auckland-Campbell 
Islands, from which only one species, Notechinus novæ-zealandiæ, 
isfknown till now. In the deeper water o ff these islands we may, 
of course, expect to find a good deal more. 
The zoogeographical relations of the New Zealand Echinoids 
will not be discussed in the present paper; this may be put off, 
till the whole of the Echinoderms has been worked out. I would only 
already now point out the faet that, excepting Echinocardium australe , 
which seems to be identical with Echinocardium cordatum , thus 
being almost cosmopolitan, and Laganum depressum, the Identific¬ 
ation of which is not beyond doubt, there is not one species 
known with certainty to occur outside the Australian-New Zealand 
region. Especially there is not one species common to 
New Zealand and the Magellanic or the Antarctic re¬ 
gion. 
From a morphological point of view no special interest attaches 
to any of the new species here described; in this regard Arach- 
noides zelandiæ and Echinobrissus recens range far beyond any of 
the new forms. Of no small interest is the observation that the 
tubercles of Pseudechinus albocinctus (and Notechinus magellanicus) 
show traces of crenulation. But the outstanding point is the 
discovery that the young Echinobrissus has a well developed dental 
apparatus, which is absorbed before the animal reaches the adult size. 
This discovery. together with that made by West er gr en in 1909 
of the existence of a dental apparatus in the young Echinoneus, 1 ) 
is of very considerable interest, especially from a phylogenetic 
point of view, throwing important light on the relationship of the 
Cassidulids. Also from a physiological point of view the absorption 
of the perfeetly developed and actually funetioning dental apparatus, 
l ) A. Agas si z. On the existence of teeth and of a lantern in the genus 
Echinoneus van Phels. Amer. Journ. Sc. XXVIII. 
