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not improbable that more than one species of Ophiomyxa will ulti- 
mately be found to occur in the New Zealand seas. 
It is the merit of H. Lyman Clark to have pointed out that 
the Ophiomyxa of New Zealand seas is not identical with that of 
Fig. 4. Ophiomyxa brcvirima (1, 3, 4) and O. australis (2, 5). All the figures e/i. — l. Part 
of ventral side of O. hrevirima ; — 2. same part of O. australis. — 3. Part of dorsal 
side. — 4. part of ventral side of arm of O. hrevirima. — 5. Part of dorsal side ofarm 
of O. australis. 
the Australian Ophiomyxa australis Ltk., as was stated by 
Mr. Farquhar. However, the characters pointed out by H. L. 
Clark as distinguishing the New Zealand species from O. australis 
do not all hold good. The genital slits, as well as the radial 
shields, ’do not appear to me to offer any reliable differences. The 
number and arrangement of the armspines: alternating 3 and four 
in breviiima, 5—6, not alternating in australis, is a much better 
and fairly constant character. But there are some other not less 
important differences. Thus the shape of the dorsal and ventral 
plates is rather different in the two species. (Cf. Fig. 4). (The thick 
