CRUSTACEANS. 245 



ceptacle rather seems to be the empty valve of one of the species. — Fig. 25. 

 Of three such valves, one contained eighteen ova, another twenty, the 

 third twenty-four. Probably, these were produced by three different 

 anunals. 



Spawai had appeared on September 15, and on October 5, some of 

 the young were hatched. They were very minute. The microscope 

 detected nothing. 



Plate LXII. 



Fig. 19. Ci/pris pilosa ? 



20. The same, enlarged. 



21. Empty shells more enlarged. 



22. Empty specimen. 



23. Exuvia. 



24. Ova, enlarged. 



25. Ova deposited in the empty valve of a shell. 



Considerable variety of the tribe Entomostraca may be found in 

 Scotland, such as the Cijpris Iccvis, which dwells along with the preced- 

 ing, and is of smaller size. A specimen spawned in autumn. 



Plate LXX. 



Fig. 10. Ci/pris Icevis. 



11, Spawn magnified. 



Cypris Forthensis. — Plate LXX. 



A very minute species of the Ci/pris inhabits the estuary of the 

 Forth, which I have obtained several times. — Plate LXX. figs. 12, 13, 

 14, 15. This is of a very faint, dull, reddish-brown, the shells opaque, 

 somewhat resembUng those of a mussel, and several exposing one or 

 more black internal specks. The animal springs through the water, and 

 crowds of it congregate on the sides of the vessel towards the light. 



Plate LXX. 



Fig. 12. Cypris Forihensis, group. 



13. Another group. 



14. Group enlarged, the shells closed. 



15. Specimen protruding parts of the animal, enlarged. 



