196 



c, Posterior angles of the telson decidedly spinous, at least half as 

 long as the outer spinules. 

 d x Carpocerite slender, not thickened in the middle. 



e x Terminal spine of scaphocerite as long as the carpocerite, 

 upper angle of basicerite spiniform. Third antennular article 

 shorter than second. Distance between the posterior pair 

 of spinules of the upper surface of the telson and the 

 median part of the posterior margin hardly more than 

 half as long as the posterior margin is wide. Eggs very 



large, giving rise to mysis tumidomanus (Paulson) 



£ 3 Terminal spine of scaphocerite distinctly longer than the 

 carpocerite, upper angle of basicerite spiniform. Third anten- 

 nular article as long as second. Posterior pair of spinules 

 just as far distant from the median part of the posterior 

 margin of the telson as this margin is wide ; spinules 

 of the upper surface rather far distant from the lateral 

 margins, inserted at the angles of a rectangle that is wider 



than long. Eggs rather numerous, 0,75 — 0,8 mm. long . Theophane de Man 

 d s Carpocerite a little thickened in the middle, ovoid. 



Terminal spine of scaphocerite as long as the carpocerite. 



Third antennular article shorter than second. 

 e l Upper angle of basicerite truncate. Posterior angles of the 

 telson about as long as the median part of the posterior 

 margin. Distance between the posterior pair of spinules 

 and the median part of the posterior margin but a little 

 shorter than the width of the latter or just as long. 

 f x Length of the large chela in proportion to that of the 



fingers as 4,2 : 1 hastilicrassus Cout. 



/„ Length of the large chela in proportion to that of the 



fingers as 2,9 : 1 hastilicrassus Cout. var. 



e„ Upper angle of basicerite spiniform, sometimes only acute. 

 Posterior angles of the telson longer than the median part 

 of the posterior margin. Distance between the posterior pair 

 of spinules and the median part of the posterior margin 

 rriuch shorter than the width of the latter, usually two- 



thirds or three-fourths, rarely oniy one-sixth acanthitelsonis Cout. 



c„ Posterior angles of telson acute, though not spinous, hardly one- 

 fourth the length of the outer spinules. Carpocerite slender, 

 3,8 — 4,1-times as long as wide, not thickened in the middle, 

 as long as the terminal spine of the scaphocerite. Third anten- 

 nular article shorter than second. Upper angle of the basicerite 



64 



