251 



139. Paracyiherois producta, (Brady & Norm.). 



(PI. CX1II, fig. 3). 

 Paradoxostoma proiactam, Brady & Norman, Mon. recent Ostracoda 1889, p. 236, 



PI. XXI, figs. 9, 10. 

 Syn: Paracytherois oblonga. G. W. Miiller. 



Specific Characters. Male. Shell, seen laterally, very narrow oblong in 

 shape, greatest height scarcely exceeding Vs of the length, dorsal margin only 

 slightly arched and sloping somewhat more steeply behind than in front, ventral 

 margin distinctly sinuated in front of the middle and gently convex behind, 

 anterior extremity rather broad and remarkably bowed below, being obliquely 

 blunted at the end, posterior gradually tapered to a narrowly obtuse corner 

 located below the longitudinal axis of the shell; seen dorsally, narrow fusi- 

 form or lancet-shaped, with the greatest width about equal to 1 /4 of the length, 

 both extremities sharply pointed and nearly equal. Valves very thin and pel- 

 lucid, with the marginal zone comparatively broad and crossed by very distinctly 

 marked pore-channels rather irregularly arranged in front. Anterior antennae 

 comparatively more strongly built than in the 2 preceding species, but of a 

 very similar structure. Posterior antennae, on the other hand, rather more slender, 

 with the penultimate joint very narrow and having the dividing suture located 

 above the middle. Oral cone very sharply pointed at the extremity and some- 

 what deflexed. Copulative appendages comparatively small, with the terminal 

 part undivided in the form of a curved beak-like lamella. 



Female of somewhat smaller size than male, and having the shell com- 

 paratively shorter, with the dorsal face more vaulted. 



Colour of shell not yet ascertained. 



Length of adult male 0.45 mm. 



Remarks. This is a very small species, and is moreover easily recognised 

 from the 2 preceding ones by the rather different shape of the shell. The 

 form recorded by G. W. Muller from the Gulf of Naples under the name of 

 P. oblonga is unquestionably identical with the present species. 



Occurrence. I have not myself taken this form; but Norman sent me 

 some specimens taken by him recently in the Bergen Fjord and mounted dry 

 on a slide. By moistening the shells, I succeeded in finding in one of them 

 the limbs tolerably well preserved, to allow of a detailed examination, and I 

 have therefore thought it right to describe the species here along with the 

 other 2 found by myself. 



Distribution. As yet only found off the west coast of Norway. 



