A REVIEW OF THE MYSIDACEA 



71 



Carapace in both sexes somewhat produced, the frontal plate being 

 a broad, rather low triangle with the vertex somewhat produced, acu- 

 minate and acute (fig. 17, a) . 



Eyes in the male (fig. 17, b) considerably smaller than in allied 

 forms, seen from above conspicuously shorter and narrower than the 

 last joint of the peduncle, the posterior margin of which is rather 

 convex; eyes in the female (fig. 17, /) distinctly larger than in the 



Figure 17. — Siriella pacifica Holmes: a, Anterior part of adult male, from above, X 22; 

 b, left eye of male, from outer side, X 22; c, terminal parts of both rami of fourth right 

 pleopod of male, X 82 (ex = exopod, en = endopod); d, end of abdomen with left uropod 

 of male, from above, X 20; e, distal portion of telson shown in d, from above, X 67; /, 

 front end of carapace with eyes of female, from above, X 22. 



male, seen from above conspicuously shorter but slightly broader than 

 the peduncular joint. 



Antennule in the male (fig. 17, a) with third peduncular joint only 

 a little longer than broad ; flagellum in the male extremely long, reach- 

 ing beyond the hind margin of fourth abdominal segment. 



Antennal scale (figs. 17, a and 17, /) subequal in both sexes, with 

 the terminal lobe much broader than long. 



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