Sexton: On a collection of Gammarus from the Königsberg Museum. 93 
Zoppot, Koliebken, Redlau. 4 tubes. ” Gammarus locusta Fbr. Danziger Bucht. 
Zoppot, Koliebken, Redlau. Zch. 1 — 25 M. Tiefe. ^ 9 15 76. no. 7427’’. 
Tube 1: 37 specimens, all much compressed, as if dried up at some time; the 
detail is confused, and the long delicate hairs have perished, owing no 
doubt to the shrinkage. 33 are G. zaddachi 6 — 13 mm long; an 
unusually large proportion of males. 
4 Gm locusta , males, 3 fully adult and 1 young, largest 15 mm. 
Tube 2: 47 specimens, 5 — 15 mm. 45 of which are G. zaddachi , the other 
2 are G. locusta , young males. 
Tube 3: 37 specimens, largest a male 11 mm. 32 G. zaddachi; and 5 
G. locusta. of which 2 are young, the other 3 are ovigerous females, 
9 — 10 mm in length. 
Tube 4*): 38 specimens: 34 G. zaddachi , and 4 G. locusta. The latterare 
adult, but quite small, the 2 males measuring about 9 mm in length, 
one of the females ovigerous. 
Adlerhorst. ”G. locusta Fbr. Danziger Bucht (Adlerhorst) Aug. 1868”. 2 tubes, 
both of which appear to have dried up at some previous period, making 
identification difficult. 
Tube 1: 19 specimens, largest 10,5 mm, all much shrunk; G. zaddachi, the 
antennae, 4 th sideplates, and 3 rd uropods are distinctive; 1 fern ale ovigerous, 
Tube 2: 6 specimens, 5 G. zaddachi. The other appears to be a young 
G. locusta, but it is in very bad condition. 
Redlau. 2 tubes ”Gammarus locusta Fbr. zw. Redlau u. Heia. 25 m Tiefe 
Aug. 1868.“ 
Tube 1: 5 specimens, 4 G. zaddachi, largest 7 mm; and 1 very small 
G. locusta. 
Tube 2: 4 small specimens, 1 G. zaddachi ; and 3 small G. locusta , the 
largest a female, only 4,5 mm in length, has eggs in the pouch, nearly 
ready to hatch, the form of the embryo being visible. 
These G. locusta are puzzling; they have the characteristic antennae, 
4 th sideplates, and 3 rd uropods, but they are much more slender than 
the marine ones and very small to be ovigerous. The female referred to 
above, however, has all the characters of a marine one more than twice 
its size with which it was compared. It may be that the brackish 
water specimens are always stunted in growth, or it may very probably 
be that the ground on which these animals were living, was not suited 
to growth, most of them being covered with incrustations and dirt. 
Putziger Wiek. 5 tubes. ”G. locusta L. Putziger Wiek. VI. 1865”. 
Tube 1 : 9 specimens; 6 G. zaddachi , 2 males, larger 14 mm long, and 
4 females; and 3 G. locusta young males. 
Tube 2: 1 speciraen, dissected, young male G. locusta. 
Tube 3: 1 male G. zaddachi, 17 mm. 
Tube 4: 15 specimens: 3 small G. zaddachi, 4 — 5 mm; and 12 females 
G. locusta nearly all with eggs. 
Tube 5: 12 specimens: 1 ovigerous female, G. zaddachi ; and 11 ovigerous 
females G. locusta, 10—11 mm. 
Kiel. ” Gammarus locusta. L. Kiel. Moebius. 1872 no. 6526”: 3 specimens G. zad- 
dachi, 13 — 15 mm, largest a male, the other 2 are females. 
