63 
resemblinc^- 1\ but very sIio;htly stouter basally and with longer distal segments; the following 
pinnules resemble P.; the distal pinnules are 4 mm. long with 15 segments of which the distal 
are nearly or quite three times as long as broad. 
The colour is white with numerous regular purple spots on the division series and arm 
bases and in band-like areas on the distal part of the arms; the cirri are white, with a band 
of pur])le on each segment. 
In this specimen there are eight IIHr 4 (3 + 4) series and one IIBr 2 series; a IllHr 
2 series is developed internally on one of the IIBr 4 (3 + 4) series. 
A similar specimen has seventeen arms, with five IIBr 4 (3 + 4) series and two IIBr 2 
series; the cirri are XVII, 18, 9 mm. long. 
The remaining two specimens are small. 
This curious little species has caused considerable trouble. Its general appearance is such 
that it is very easih- confused with Hcteronietra bengalensis with which, moreover, it agrees in 
colour, diftering entirely from any species of Zygometridae heretofore known. 
All of the records of Heterometra dettgaletisis from Australia (from Port Curtis and the 
Holothuria Bank) refer to this form. 
Very recently Dr. Hubert Lym.\n Ci..\rk has rede.scribed this species (Publication N" 212 
of the Carnegie Institution of Washington, 191 5, p. 105) under t!he name oi Heterovietra 
dclicata, basing his description upon a specimen which he found on the sand flat on the southern 
side of Friday Island, Torres Straits. 
Catoptometra A. H. Clark. 
Key to the Species of the Genus Catoptometra. 
a^ 40 — 80 arms; all the division series 2 (Phil i p p i n e Islan ds) magnifica 
a- less than 30 arms; IIBr series 4 (3 + 4) 
b' II — 13 arms; cirri short and stout, few or none of the component segments 
being longer than broad; in life banded broadly with brilliant red and 
brilliant yellow alternately (Hong Kong to southern Japan). . . riibrofiava 
b- 20 or more arms; cirri longer and less stout, the longest segments being 
twice as long as the median diameter; in life usually uniform in colour, 
yellow, brown or green, rarely red and yellow 
c' 20 arms; 15 — 16 cirrus segments; ossicles of the division series and 
first two brachials with jjrominently everted and produced spinous 
distal borders; dorsal pole of the centrodorsal papillose or finely 
spinous (so u t he r n J a pa n) hart/audi^) 
c'- 20 — 27 arms; 15 — 19 (usually 17 — 18) cirrus segments; ossicles of 
the division series and arm bases smooth ; dorsal pole of the centro- 
dorsal smooth; colour usually green, rarely red and yellow (Malay 
Archipelago and Philippine Islands) ophiura 
l) Synonym Zygometra koehleri .\. H. Clark. 
