191 
In youn.u- individuals in wliich the radials are still about half as large as the IBrj (see 
ihe "ChallentTcr" Rr])ort, pi. i6, fig. 5) there is but little trace of the dorsolateral processes 
characteristic of liie adults; they are only slightly evident, though they can be made out as a 
thickened ridge in the place they will eventually occupy; at this stage also the genital pinnules 
are slender and evenly tapering, showing no trace of the lateral expansion of the segments 
which is so marked a feature in the hilly grown. 
As the radials become shorter the pro.ximal border of the IBr, becomes produced so 
that it conceals the radials and proximal edge of the centrodorsal when the animal is viewed 
laterally. The dorsal surface of the radials is gradually resorbed as the proximal margin of the 
IBr, is produced, so that the rays and arms appear to be too large for the radials and 
centrodorsal, giving the appearance of having been glued upon them instead of having grown 
out from them. 
In very large specimens the produced borders (proximal and lateral) of the IBr,, which 
are tvpicallv smooth, become crenulate and scalloped. 
The two examples from Stat. 124 resemble those from Stat. 122. 
Charitometra A. H. Clark-. 
Key to the .Species of the Genus Charitometra. 
a^ Brachials from the fourth onward with thickened, everted and tubercular distal 
borders, this character gradually dying away after the brachials become triangular; 
arms about 100 mm. long (Kermadec Islands; ?Fiji; i 1 34 and "'2430 
Metres) • dasicurva 
a" Brachials with unmodified distal borders, the arms appearing quite smooth ; arms 
about 90 mm. long (Ker«madec Islands to 'Fiji; 1134 Metres) .... incisa 
Strotometra A. H. Clark. 
Key to the Species of the Genus Strotometra. 
a' Distal border of the second brachial everted, standing out at right angles to 
the dorsoventral axis of the arm as an enormous this rounded or fan-shaped 
crest, with a rounded or broadl\- .scalloped edge, .sometimes divided in the 
middle, which may reach 1.5 mm. in height, the height being three or four 
times the greater (outer) length of the ossicle; the fourth brachial (the epizygial 
of the first syzygial pair) has a similar crest nearly, if not quite, as large, the 
fith brachial has a crest about half as high, and more irregular; the sixth has 
a strongly produced and thickened distal edge, which is coarsely scalloped; 
the following brachials are of the normal type, with slightly produced and 
finely spinous distal borders (east of the northeastern end of Celebes; 
I 165—1264 Metres) ornatissimns 
a- None of the brachials have extravagantly everted distal borders 
