243 



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 the different 

 shape of the exposed section of the body, which is always globular, 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 a larva of 

 Phryxus abdominalis or any other Bopyrid, as is easily seen from the structure 

 of the legs and uropoda. 



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. 



Distribution. Coast of Denmark (Copenh. Museum), Black Sea (Czer- 

 niawsky). 



I add below the description of 2 different forms of Cryptoniscidce, the 

 exact relation of which to other Cryptoniscian genera it is, however, impossible 



