263 



Skutesnaes, south west coast of Norway. Norman has moreover taken it at 

 Lervik, Hardanger Fjord. All the specimens examined by me were of the 

 female sex. 



Distribution. British Isles. 



149. Paradoxostoma abbreviatum, G. O. Sars. 



(PI. CXIX, fig. 1). 



Paradoxostoma abbreviatum, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 94. 

 Syn: Paradoxostoma coecum, G. W. Miiller. 



Specific Characters. Female. Shell rather compressed, seen laterally, 

 sort oval in shape, much broader behind than in front, greatest height about 

 equal to ;! -, of the length, dorsal margin gently arched, sloping rather steeply 

 behind, ventral margin very slightly sinuated in front and considerably bowed 

 behind, anterior extremity narrowly rounded and somewhat oblique below, 

 posterior much broader and terminating in a blunt corner; seen dorsally, 

 rather narrow, lancet-shaped, with the greatest width in the middle and not 

 nearly attaining Va of the length, anterior extremity more sharply pointed 

 than the posterior. Valves thin and pellucid, with the surface smooth and 

 polished. Eye well observable in the living animal, but, as usual, soon 

 vanishing in preserved specimens. Anterior antennae moderately slender, with 

 the 2nd joint of the terminal part very narrow and fully twice as long as the 

 1st. Posterior antennae with the 1st joint of the terminal part rather dilated, 

 dividing suture of penultimate joint located a little above the middle, vesicle 

 leading to the flagellum deeply cleft into 2 diverging rami. Legs compara- 

 tively thin, and of the usual structure. 



Male a little smaller than female and having the shell comparatively less 

 vaulted dorsally. Vesicle leading to the flagellum of the posterior antennae 

 much larger than in female, with the rami club-shaped. Copulative appendages 

 distinguished by the peculiar development of the terminal part, which is pro- 

 duced in the form of a very long falciform curved spine, basal lamella of 

 moderate size and securiform in shape. 



Colour of shell clear yellowish, tinged at the extremities with orange, and 

 exhibiting in the centre a rounded patch of a dark brownish hue. 



Length of adult female 0.58 mm. 



Remarks. This is a well recognizable species, and I am perplexed to 

 see that Brady at first (in his Monograph) has uttered some doubt about its 

 distinctness from P. variabile, to which species is does not in reality present 



