92 
Sitzungsberichte: Faunistische Sektion. 
going on. The absence of eggs or young in a collection does not usually 
mean much; if the eggs are advanced or the young hatched, the female 
will aimost invariably extrude them when dying. 
Tube 2: 17 specimens; 2 together in a small glass, male and female, measuring 
12 mm and 11 mm respectively. The others ränge from 1 — 11 mm 
almost all females. 
Danziger Bucht. 1 tube*) ” Gammarus locusta Montagu. Danzig” containing 
2 G. pulex , 99 G. zaddachi and 1 G. locusta. 
The 2 G. pulex are male and female, the male a beautiful specimen, 
IS mm long, the female 15 mm. 
The G. zaddachi are fine specimens, 7 — 19 mm in length, some 
exceedingly transparent, others again more solid in appearance, and two or 
three with numerous long hairs on the hinder peraeopods and pleon, thus 
approaching the freshwater type. The presence of these, and of G. pulex 
suggests the water as only weakly sahne, if not fresh. The males are the 
largest, as is usual in the genus: one female had a few eggs in the pouch, 
and 1 young, 2 mm long was found. 
The one G. locusta is a small specimen similar to those in the 
next sample. 
Fahrwasser. 4 tubes labelled ”6r. locusta Fbr. Mares. Danziger Bucht (Fahrwasser). 
Aug. 1868”. 
Tube 1: 15 small specimens 2 — 7 mm long. 
6 are G. zaddachi . The remaining 9 are very young G. locusta, 
some apparently not long extruded from the marsupial pouch. These 
have in the upper antenna 8 joints in the primary and 2 in the accessory 
flagellum, and in the lower antenna 5 joints in the flagellum. The eye 
is oval and larger in proportion than in the adult, the hind lobe of the 3 rd 
peraeopods is rounded, not acute, and the rami of the third uropods are 
very unequal in length. 
Tube 2: 8 specimens: 6 G. zaddachi, largest 10,5 mm; and 2 G. locusta 
the larger one 10 mm in length. 
Tube 3: 40 rather small specimens, 3 — 10 mm. 28 G. zaddachi. Of these, 
4 females still have eggs remaining in the pouch; 12. G. locusta , all 
small; 1 female, 7 mm long, had eggs. 
Tube 4: 11 specimens, larger than in the preceding samples. 7 G. zaddachi 
7 — 13 mm. 
4 G. locusta . The largest are males, 9,5 mm long, sexually mature, 
but not full grown. These, as compared with marine specimens from 
Plymouth, are rauch smaller, and more slender. 
Zoppot. 2 tubes, ”G. locusta Fbr. Mares. Zoppot 1872. no. 6526' . 
Tube 1: 19 specimens all small, typical brackish water G. zaddachi . 
Tube 2: 26 beautiful semi-transparent specimens. The figure of G. zaddachi 
is drawn from one of these. 
Zoppot.*) ” Gammarus locusta Fbr. Mares. Zoppot. Aug. 1877 no. 7942.” 11 specimens 
G. zaddachi, as in the previous sample, exceedingly transparent; the 
largest, a male, 16,5 mm in length. 
*) The samples examined for my previous paper in the Proc. Zool. Soc. London 
1912 p. 657 are indicated by an asterisk. 
