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about four to ten such long teeth were observed, scattered, situated at about equal distances
from one another; on the posterior main claws they become fewer and fewer and shorter and
shorter; in some species, however, they are rather short even on the anterior claws. The main
claws, at least the anterior ones, are furnished dorsally with short hairs. Claws nos. 2 and 3
are very finely serrated dorso-distally; I cannot say with certainty whether a similar serration
occurs in all the species described in this treatise, as this part of the claws is often rather
con-siderably worn. The posterior claws are finely pectinated. Sometimes the posterior claws are
finely annulated and on account of this they are exceedingly like bristles; this character cannot,
however, be used as a criterion in classifying the claws into main claws and secondary claws,
as it varies, at least in a number of species; in some forms there seems to be no annulation at all.
The lamellae often have short, fine hairs behind the claws.
Male: — In some species it has the same number of claws as in the female, in others
it has slightly fewer. It is practically impossible to discover any division into main claws
and secondary claws. The first claw is, at least in a number of species, somewhat more slender
and somewhat more boldly curved than in the female. The equipment of teeth on the claws
is somewhat weaker, especially on the first claw; this claw is almost entirely unarmed; its
distal quarter is even quite smooth.
The u p p e r li p is small and has two lobes; cf. G. 0. Sars, 1887, pl. V, figs. 4 and 5.
It has a very small field of glands.
The rod -shaped organ is rather long, of moderate breadth and rounded distally;
its shape is somewhat irregulär, most often somewhat broader at the middle; unjointed. In most
of the species described below of about the same type as that reproduced in fig. 11 for A. Ohlini.
The lateral eyes are most often well developed; see below, A. abyssicola.
Gills: — These are of quite the same type in all the species I have investigated.
Cf. G. 0. Sars, 1887, pl. VI, figs. 6 and 7. There are fourteen of them, seven in euch row.
They are all of about the same type, rather long and broad lamellae, of uniform width and more
or less well rounded distally.
Special terminologi/: — Shell: — The list inside the posterior margin of the shell is
called ,,the spine-bearing list“.
For the terms for the distal bristles of the first a n t e n n a see the special
terminology of the family.
Mandible: — The scythe-shaped process: The spine which is directed
proximally on the distal part of the ventral margin and which is characterized by the faet that it
is continued on the lateral side of the process by a low, bow-shaped ridge, armed, like the spine,
with a close series of stiff, rather short hairs, is called ,,the main spine“. The protubérances
and spines on the ventral edge proximally of the main spine are called „ventral spines“. The
serrate teeth of the dorsal edge are called „the dorsal serrate teeth“. The bristle distally of
these serrate teeth is called „the dorsal bristle“. The backward p o i n t i n g pr
o-cess: The three or four bristles situated distally on this process, which are characterized
by the faet that their secondary spines become weaker and weaker distally are called „the
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