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with the propodos almost globular and the dactylus straight, styliform. Uropoda
with the outer ramus very small, scarcely attaining half the length of the inner.
Colour of female whitish, of male pale yellow, with a bister-brown assemblage of
pigment on the anterior part of the dorsal face. Length of adult female nearly
5 mm., of male 1.35 mm. Parasitic on Peltogaster paguri Rathke.
Remarks. This is the typical species, the female of which is well distin-
guished from that of the Mediterranean form, L. monoplithalma, by
shape of the exposed section of the body, which is always globular,
the different
whereas this
part is stated to be cylindrical in the Mediterranean species. As to the male or
last larval stage, it may be noted, that the figure given in Sp. Bate and West-
wood's work, p. 261, does not belong to this form, but is apparently
Phryxus abdominalis or any other Bopyrid, as is easily
of the legs and uropoda.
a larva of
seen from the structure
Occurrence. Rathke found 8 specimens of the male, or more properly
last larval stage, of this form within the body-cavity of a Peltogaster paguri found
attached to the tail of a Eupagurus bernhardus taken at Christiansund, and Prof.
Lilljeborg observed the adult female at Molcle and Bergen, likewise on Peltogaster
paguri, which in this instance was attached to another species of Eupagurus, viz.,
E. pubescens Kroyer. I have myself not yet succeeded in finding the female, but
males, or larvae in the last stage, I have several times taken, partly from the body
cavity of Peltogaster paguri, partly free in the sea. The figures of the female here
given are from a specimen kindly sent to me from the Museum of Copenhagen.
It is here represented both in its natural connexion with the Peltogaster and
isolated from it. Together with this specimen was also sent me, in a sepa-
rate tube, 3 larvae labelled Liriopsis pygmwa cf . Though
in all probability they
were found associated with the female Liriopsis, they all, on a closer examination,
turned out to be Bopyrid larvae. Indeed, I have myself occasionally
found such
larvae in the body-cavity of Peltogaster; but there cannot be any doubt that they
did not have any true relation either to the Peltogaster or to the female Liriopsis,
but might, by a mere accident, have entered the cavity of the former.
niawsky).
Distribution. Coast of Denmark (Copenh. Museum), Black Sea (Czer-
I add below the description of 2 different forms of Cryptoniscidce, the
exact relation of which to other Cryptoniscian genera it is, however, impossible