108 
indeed, the figure recalls that of H#. albocinctus, but the colour of 
the test is quite different. (2.) The measurements do not yield the 
same proportions as those given by Agassiz, in which the number of 
interambulacral tubercles in a vertical row is less for a given height, 
and the spines are rather larger for a given diameter, than in our speci- 
mens. (3.) Filhol (1885) states, on the authority of Perrier, that the 
common Echinus which he collected on Stewart Island and in Cook 
Strait is H. margaritaceus, and makes no mention of EH. angulosus. 
Unfortunately I have not access to any detailed account of the 
former, but Agassiz refers (p. 493) to the large pedicellarie and large 
miliaries as being characteristic; he also states that the primary 
spines are white and the secondaries yellow; while the photographs 
given by Agassiz and Pourtates (1874) show a very different type 
of tuberculation. Hence I conclude that our specimens are not 
E. margaritaceus. Moreover, Koehler’s EF. antarcticus (1901)—which 
Mortensen has suggested may be a synonym of EH. margaritaceus— 
has a distinct centro-dorsal surrounded by quite small periproct plates ; 
the coronal plates are few and high; and the general appearance and 
details are different. As Mortensen made the above suggestion (al- 
though disallowed by Loriol), there must be similarities between the 
two species, and, if so, it is evident that our urchin is not E#. margari- 
taceus. At the same time it is curious that this species, which Filhol 
found so common, is not represented in any of our museums here. 
In view of this doubt, and as no description of our FE. angulosus 
has appeared in publications readily accessible to naturalists in New 
Zealand, i give the following brief account. 
Measurements were taken of our largest and smallest denuded 
individuals. 
: B, 
25 ee 19'theciee 
ubercles. 
Mm. Mm. 
Diameter. 26 Se 42 sh 30 
Height Be =m sie 27 ihe be 
Width of abactinal are se 7 rue 6 
* actinal area.. Bi 13°5 ie ll 
i poriferous zone és 3°3 at. 2 
Spines (longest) a si) ees Ps 5-7 
The poriferous zone was measured at the ambitus. The largest 
tubercles are below the ambitus. 
The colour of the (dried) test is a light greenish-grey with pale- 
brown poriferous zone, and a line of the same tint in the middle of 
each ambulacrum; the spines are pale-green, tipped with white ; 
those around the mouth in recently obtaimed specimens are very 
pale violet below the tips; the secondary spies are olive brown. 
In the interambulacral area each plate bears a moderately large 
tubercle, outside which are two smaller tubercles in a horizontal row ; 
or in plates near the ambitus two rows of such tubercles, and on the 
inner side a single tubercle of about the same size. The arrangement 
