46 
the form of the cephalon, the small eyes, the short accessory ap- 
pendage (4 joints) of the superior antennæ, the unusually elongated 
and slender pereiopoda, the second joint of p5 rounded at the infero- 
posteai corner, and the inner ramus of up3 about as long as the 
Fig, 
E 
AT 
Gammarus pulex dg 20 m 
8. Gammarus pu leæd, 14 mm, from ge 
Fig. 9. Gammarus pulex from Frisenvold ; the cephalon. 
first joint of the outer ramus (but Hoek (1. c. fig. 12") has drawn 
the inner ramus only about ”/4 as long). 
All my specimens from Randers, including one large spec. 20 
mm and several 10—15 mm in length, differ from this descrip- 
tion in regard to the following characters : the infero-posteal cor- 
ner of the second joint of p5 is more right-angled (fig. 7), 79! 
so rounded as. shown by Sars; in up3 the inner ramus is not 
more than %/6 as long as the first joint of the outer ramus. Mi 
none of the spec. (except those from off Tjæreby) are the pere!0" 
poda especially p7 as long and thin as shown by Sars, but are 
as drawn by Sexton (l. c. 1913, P1.-4. fig. 1): p7 should, with the 
