BIIIANG TILL K. SV. VET.-AKAD. HANDL. BAND 20. AFD. IV. N:0 2. 19 



of a yoimg female with spine and trace of the necktooth, liighly 

 magnified. Fig. 19. Young male born between 23^ — 26th Aug. 1893. 

 X 50. Fig. 20. " Young female. 28tii Ang. 1893. x 50. Fig. 21. 

 Young female with spine. The posterior sides of the shell aculeated 

 and indistinctly reticulated. Fig. 22. Female with ova. x 50. 

 Tab. II. Fig. 23. Female with spine and ephippium, this still semi- 

 pellucid. 30tb Aug. 1893. x 50. Fig. 24 female wjtliout spine. The 

 shell indistinctly reticulated. Sept. 1893. Fig. 25. Young male, one of 

 the specimens hatched after Aug. 23r'i and delineated 31st Aug. 1893. 

 X 50. Fig. 2G. Very young Hyalodaplmia. July 1893. x 30. Figs. 27 

 and 28. Young specimens of Hyalodaphnia. July 1893. x 50. Fig. 

 29. Young female with ova. July 1893. x 50. Fig. 30. A young 

 Hyalodaphnia with falciforme crista on the head. July 1893. x 50. 

 Fig. 31. Young female of Hyalodaphnia, in which the contours 

 of the future crista, to be laid bare after next exuviation may be 

 seen through the shell. July 1893. x 50. Fig. 32 a). A female with 

 crista of this form. x 50, b) head of the same specimen larger 

 scale. X 150. (Daphnia yaleata. Särs? or Berolinensis Schödler.) 

 Fig. 33. The abdomen of a specimen in the same stage as lig. 29 or 

 31. Fig. 34 female of- a Hyalodaphnia much resembling H. Kahl- 

 bergensis Schödler. Beginning of Sept. 1893. x 50. Fig. 35 a) a 

 female specimen, taken at the same time, resembling Daphnia galeata 

 Särs, X 50, b, abdomen of the same specimen, on larger scale. x 200. 

 Figg. 36, 37 and 38 females of a Hyalodaphnia from the same place 

 as the foregoing 20ti> Sept. 1893. x 50. Fig. 37 a) male takeii at 

 Ihe same time and place. x .50, b) abdomen and c) one of the an- 

 tennae of the same specimen. x 160. Fig. 40. A fragment of tlic 

 hpine of an empty shell of a Hyalodaphnia. x 160. 



