476 PROFESSOR CHARLES CHILTON ON THE 
Heller from O. rossi Walker. Monsieur CHEvREUX had also kindly sent me a specimen 
of O. obtusa Sars from Norway, and an examination of this showed that in size and 
in all essential characters it was identical with the specimens of Anonya chilensis 
Heller, though the eye was less oval and more widened below, and hence more like the 
specimens of O. rossw. Consequently I am forced to the conclusion that O. obtusa 
Sars also belongs to this widely distributed species. O. musculosa Stebbing was 
described from a single specimen obtained from the south of Japan, and from the 
description given I think there can be no doubt that it is the same as the other 
forms already described. O. abyssorum Stebbing is supposed to be distinguished from 
the other species mainly by the more strictly chelate character of the second gnathopod, 
and the figure of the Challenger specimen shows the palm much more produced than it 
is in any of the forms | have already referred to, though, as I have pointed out, there is 
considerable difference among them in this character. In all other points there seems 
little to distinguish O. abyssoruwm from the others, and, as mentioned above, STEBBING 
has already given Anonyx chilensis Heller as a possible synonym of this species, 
although the second gnathopod in that form can hardly be described as truly chelate. 
For some considerable time I was inclined to think that perhaps it would be wise 
to keep O. abyssorum as a separate species ; however, after having finished my exami- 
nation of the forms already mentioned, I found in the Scotia collection a number of 
specimens from Saldanha Bay in South Africa which in most points are quite similar 
to O. rossi, but in which the second gnathopod has the palm so much produced that 
it could quite strictly be called chelate, as in O. abyssorum Stebbing. 
If this form had agreed in other points with Sreppine’s O. abyssorum it would 
confirm the opinion that this is a distinct species; but this is not the case, for the first 
enathopod, instead of having the basos slender and the propod rather broad, as in the 
type specimen, is somewhat stouter than usual, and differs also in having the propod 
considerably narrowed distally, so that its palm is much shorter.* In it the eyes are 
black, usually oval, though slightly widening below, and they vary in size and in the 
amount of widening at the lower part. After careful consideration I think it best to 
include this form also in the same species as the others, although they might perhaps 
be looked upon as different variety, though not corresponding in all points with the 
form described as O. abyssorum by STEBBING. 
If all these forms are combined they must be known under the name of Orcho- 
menopsis chilensis Heller, as that name has priority by many years. With regard to 
O. cavimanus Stebbing, from the Kerguelen Islands, Stepsine himself has identified 
it with O. zschauii (Pfeffer) ; but, as I have shown elsewhere, PrEFFER’s species is quite 
distinct in the shape of the dorsal process on the urus and in the greater stoutness 
of the body and the character of the first gnathopod, and has been since redescribed by 
CuHEVREUX under the name Waldeckia obesa. 
* In the stout basos and in the character of the propod the first gnathopod in these specimens shows 
considerable approach to O, nodimanus Walker, but it lacks the tubercle present in that species. 
