158 



Occurrence. The 2 valves, originally examined by me, were found by 

 my late father in shell-sand from 0xfjord, Finmark. Norman found subsequently 

 some empty shells at Stoksund in the Hardanger-Fjord, and more recently the 

 same author met with this species, in fresh and living specimens, in Kloster 

 Fjord, East Finmark. Some few of these specimens were kindly sent to me, 

 mounted dry, and by moistening them I found in one of the shells most of 

 the limbs tolerably preserved to allow a closer examination. On the accom- 

 panying plate figures of these limbs are given; but the posterior part of the 

 body was shrunk, and could not of course be compared with that of the 

 preceding species. 



Distribution. British Isles, Spitsbergen, Franz-Josef Land. 



Fossil. Norway, Scottland. 



Gen. 33. Cytheridea, Bosquet, 1852. 



Generic Characters. Shell more or less reniform in shape and rather 

 solid, with the surface evenly convex, without lateral protuberances, but marked 

 with more or less conspicuous flattened tubercles. Valves only slightly unequal, 

 with the edges unarmed; marginal zone rather narrow and densely striated; 

 inner duplicatures broader than in Cyprideis. Hinge about as in that genus. 

 Anterior antennas very robust, with the terminal joint comparatively small. 

 Posterior antennae with the flagellum reduced in female, apical claws 2 in 

 number. Vibratory plate of mandibular palp small, with the number of seta; 

 reduced. Palp of maxillae with the distal joint rather prolonged. Legs very 

 distinctly transformed in male; right 1st leg pronouncedly prehensile, with the 

 joints of the terminal part more or less confluent; right 2nd leg with the ter- 

 minal part reduced to a slight rudiment; left 2nd leg much coarser than in 

 female, subprehensile; right 3rd leg with several bunches of hairs on the 1st 

 joint of the terminal part. Caudal rami and genital lobes about as in Cyprideis. 



Remarks. This genus is here taken in a more restricted sense than 

 generally admitted, some of the species formerly referred to it being discarded 

 and transferred to the genus Cyprideis. As the type of the present genus may 

 be considered C. papillosa, Bosquet. The genus is represented in the Norvegian 

 Fauna by 2 well-defined species, to be described below. 



