

Gen. 12. Cyclocypris, Brady & Norm., 1889. 



Generic Characters. Shell rather tumid, of a more or less rounded oval 

 shape, with the dorsal face evenly vaulted. Valves subequal, with the inner 

 duplicatures comparatively narrow. Eye well developed, with dark pigment. 

 Both pairs of antennae powerfully developed, and perfectly adapted for swim- 

 ming. Natatory setas of the posterior ones unusually prolonged, extending far 

 beyond the tips of the apical claws; penultimate joint of these antennae in 

 male distinctly subdivided, but wilhout any traces of sensory spines. Mandi- 

 bular palp of quite normal structure. Maxillae with the masticatory lobes com- 

 paratively short, palp of moderate size. Maxillipeds provided at the base with 

 a rather fully developed vibratory plate edged with the normal number (6) of 

 plumose setae; palp in female comparatively small and simple, in male trans- 

 formed in the normal manner, the dactylus being well defined from the pro- 

 podos and of different shape in the 2 palps. Anterior legs not much elongated. 

 Posterior legs rather larger, with 2 setae inside the penultimate joint, and the 

 terminal joint unusually produced, apical setae 3 in number and very unequal, 

 the outermost one being greatly prolonged and abruptly reflexed. Caudal rami 

 well developed, sublinear in form, with the apical claws comparatively strong, 

 dorsal seta small and rather remote from the apex. Copulative appendages 

 of moderate size, terminating in one or 2 broadly rounded lappets. Ejacula- 

 tory tubes with I more or less densely crowded whorls of radiating spikes, 

 proximal end of the tubes transversely truncated. 



Remarks. This genus was proposed in the year 1889 by Brady and 

 Norman, to include the species recorded by the present author as Cypris 

 globosa, the other species now comprised within this genus being retained by 

 them in the genus Cypria of Zenker. From the latter genus, in the restriction 

 at present adopted, it may at once be distinguished by the much more tumid 

 shell, and in the structural details also some well marked differences are found. 

 4 species referable to this genus will be described in the sequel. 



26. Cyclocypris globosa, G. O. Sars. 



(PI. XL1I). 

 Cypris globosa, G. O. Sars, Zool. Reise i Christianias og Trondhjems Stifter 1862, p. 27. 



Syn: Cypris cinerea, Brady. 

 Cyclocypris dispersa, G. W. Miiller. 



Specific Characters. Female. Shell very tumid, seen laterally, rounded 

 oval in shape, greatest height in the middle and about equal to 2 /s of the 



