256 



setiferous ledge, last joint with 2 unequal claws, flagellum very coarse. Oral 

 cone of a similar appearence to that in Cytherois, but with the sucking disk 

 completely closed. Mandibles thin, styliform, terminating in a sharp point, 

 palp very narrow and imperfectly jointed. Maxillae provided at the extremity 

 with 3 masticatory lobes, the innermost much smaller than the other 2, palp 

 rudimentary or quite wanting, vibratory plate with 2 partly connected thin 

 deflexed setae at the base. Legs narrow and rapidly increasing in length 

 posteriorly, with the terminal joint, as a rule, very slender and in the last pair 

 distinctly ciliated along the anterior edge, apical claws comparatively short and 

 stout. Caudal lamellae very small, with a recurved bristle in front. Ripe ova 

 received in the cavity of the shell for further development. Copulative appen- 

 dages of male with the basal part large and expanded, sending off below a 

 thin lamella, terminal part poorly developed and more or less spiniform in shape. 

 Remarks. This genus was established in the year 1855 by Fischer, to 

 include a Cytherid (P. dispar) observed by him at Madeira, and was chiefly 

 characterised by the suctorial nature of the mouth. Many other forms, 

 apparently agreeing in this respect with Fischer's species, were subsequently 

 detected and referred to the same genus. Yet, as above mentioned, G. W. 

 Miiller has pointed out certain well-marked differences of the mouth-organs in 

 some of these species, inducing him to the establishment of the 2 new genera 

 Cytherois and Paracylherois treated of in the preceding pages. There still 

 remains however a rather considerable number of forms unquestionably referable 

 to the present genus in the restriction here adopted, both from the northern 

 Ocean and from more southern latitudes. In the following pages 7 species, 

 as yet observed off the Norwegian coast, will be described. 



143. Paradoxostoma variabile, (Baird). 



(PI. CXVI). 

 Cvthere variabilis, Baird, British Entomostraca, p. 170, PI. XXI, figs. 10, 11. 



Specific Characters. Female. Shell, seen laterally, oval subcuneiform in 

 shape, rather high behind and gradually narrowed in front, greatest height 

 nearly equal to half the length, dorsal margin well arched behind and sloping 

 slowly anteriorly, ventral margin scarcely at all sinuated, being conspicuously 

 bowed in its posterior part, anterior extremity narrowly produced, posterior 

 much broader and obliquely rounded, with a slight indication to an angle 

 above; seen dorsally, oblong oval in outline, with the greatest width in the 

 middle and somewhat exceeding VH of the length, both extremities obtusely 



