279 
like spines is situated. To this must be added that the mandible 
has only three teeth, and a pointed lower angle, and that the penis 
is again without rings or ridges. 
Oxynaspis celata is evidently a highly variating species, and 
the range of the species, and its local subspecies and races or 
forms ought to be subject to a thorough study on large material from 
different localities. 
Genus Octolasmis (Gray) Pilsbry. 
[Dichelaspis Darwin]. 
Octolasmis ovthogonia (Darwin). 
Cebu, at low tide on muddy beach. 21/11 14. Four specimens attached 
to the naked upper part of the axis of a Virgularia. 
The specimens entirely agree with the descriptions given by 
Darwin (1852), and Hoek (1907), but their size far surpasses 
that of previously known specimens, and also gives an evidence 
of the variating length of the peduncle owing to different States 
of contraction. The following table gives the measures in milli¬ 
meters : 
I 
II 
III 
IV 
Capitulum <1 
[ length 
13 
10 
10 
9 
| width 
7 
6,5 
6 
4 
Peduncle 
length 
6 
6,5 
4 
3 
Genus Heteralepas Pilsbry. 
In instituting the genus Pilsbry (1907) at once calls our at¬ 
tention to the faet that the genus contains two very different groups 
of species, and he accordingly divides the genus into two sub¬ 
genera Paralepas, and Heteralepas s. str. * 1 ) Indeed as he States, 
mueh speaks in favour of raising the two subgenera to generic rank. 
x ) It is indeed unpractical to use the same name for two different cathe- 
gories as is done here for a genus and one of its subgenera, or groups 
of species, a course often followed by Pilsbry. We had better follow 
the use of the botanists who give the prefix Eu- to the central group of 
the genus, thus avoiding confusion. In the present case the subgenus 
ought to have had the name Euheteralepas instead of Heteralepas s. str , 
I shall nevertheless not now make any change in the nomenclature in¬ 
stituted by Pilsbry for the above-named genus. 
