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Show 298 MR. ROBERT GURNEY ON FRESHWATER [Nov. 29, P l a t e X V I I . Fig. 9. Madrellaferruginosa, central tootli (p. 269). 10. Facelina lineata, side view of anterior end (p. 288). 11. „ „ ventral view of anterior end. 12. Stiliger irregularis, tooth (p. 291). 13. 13 a. Placobranchus ocellatus, dorsal views (p. 294). 14. JElysia dubia, wings open (p. 297). 15. „ „ wings closed and body elongated. 16. „ „ crawling foot uppermost on surface of water. 17. „ „ teeth. 18. Mlysia marginata, teeth (p. 296). 3. Oh a small Collection of Freshwater Entomostraca from South Africa. By R o b e r t G u r n e y , B .A ., F.Z.fe. [Received June 21, 1904.] (Plate XVIII.*) The collection which I describe here was kindly entrusted to me to work out by Prof. Jeffrey Bell on behalf of the Natural History Museum. The specimens were partly mounted on slides and partly contained in tubes, and were collected by Major E. Eckersley, R.A.M.C., from a water-hole on the veld at Kroonstad, O.R.C. This water-hole was a collection of surface-water, quite dry in ordinary weather but filled up by thunder-showers. Unfortunately very few specimens were preserved, but the few that there are seem of sufficient interest to deserve description, especially as so little is known at present about the Entomostraca of South Africa. Of the seven species collected, only three have been previously described ; of the other four, three are apparently new and one is represented by only a single mutilated specimen. The following is a list of the species :- P h y l l o p o d a . F am . B r a n c h ip o d id ,e , S tr eptocephalus d r eg e i, G, 0. Sars. (Plate XVIII. figs. 1, 2.) Sars, Arch. f. Math, og Naturv. xxi. no. 4, 1899, p. 19. Of this species three males and three females were included in the collection. The male only has as yet been described, so that I will give a short description of the female. Female.-Body slender; thoracic region as long as the caudal region exclusive of the caudal rami, which are long and densely fringed with ciliated setae. Superior antenna; long and slender; inferior antennae considerably shorter than the superior, foliaceous, the tip truncated and with a short conical process. Marsupium not reaching beyond the second caudal segment: in one specimen it contains a single row of eggs, each enclosed in a thick capsule with conspicuous more or less polygonal markings (fig. 2). * For explanation of the Plate, see p. 301. |
