296 Part II1.—Ninth Annual Report 
LEPTODORIDA. 
Leptodora, Lilljeborg (1861). 
Leptodora hyalina, Lilljeborg. 
1874. Leptodora hyalina, Weismann, Bau und Lebenser, von Leptodora 
hyalina. 
1884. Leptodora hyalina, Herrick, loc. cit., p. 128, pl. N, figs. 6, 7. 
This is a large species ; some of my specimens from Loch Leven measure 
nearly half an inch in length. Both branches of the antenne are four- 
jointed ; the body is elongated, not curved as in Bythotrephes. It is con- 
sidered to be a somewhat rare species, but it was not very rare in Loch 
Leven. 
EXPLANATION TO PLATES. 
Puate V. 
Fig. 1. Monospilus tenwirostris, x OG 
Fig. 2. Scapholebris mucronata, head with spine, ne ge 0) 
Fig. 2a. ne e head without spine, x 40 
Fig. 28. st s intermediate form of spine, x 40 
Fig. 20 "5 a post-abdomen, . x 110 
Fig. 3. (1%) Certodaphnia punctata, x D6 
Fig. 3a. z ‘a post-abdomen, x 132 
Fig. 38, af a part of carapace, highly magni- 
fied. 
Fig. 4. Daphnia jardin, x 40 
Fig. 4a. Me ‘3 post-abdomen, x 50 
Puate VI. 
Fig. 5. Leydigia quadrangularis, x 52 
Fig. 5a. i sy antenna, x 150 
Fig. 5s. is post-abdomen, x -87 
Fig. 6. Alonella nana, x 165 
Fig. 7. Candona ambigua, u. sp., seen from left side, x 65 
Fig. 7a. 5 vi seen from above. x68 
Fig. 7B. . oe antenna, x 165 
Fig. 7c y Uy antennule, x 145 
Fig. 8. if pubescens, seen from right side (for com- 
parison), x 60 
Fig. 8a. 3 ‘ seen from above (for compari- 
son), x 60 
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