254 Mr. Baird on British Entomostraca. 



described, and immediately after the fourth moulting we see 

 the eggs already laid and deposited in this space, where they 

 remain till fully hatched. 



Species. v 



I. Daphnia Pulex. Valvulis longe caudatis ; capite magno ; ramis plu- 

 mosis ; segmente corporis sexto quatuor lobulis instructo. 



Hab. Ponds and ditches. Common. 



Synonyms. Pulex arborescens, Swammerdam, Hist. Insect. Generalis, 

 p. 76. tab. 1. fig. a, b, c, 1669. — Vermes minimi rubri, Merrett, Pinax 

 Rer. Nat. Britan. p. 207, 1677. — Animaletti aquatici, Redi, Osserva- 

 zioni, tab. 16. fig. 5, 1684. Redi, Opere, vol. ii. tav. 16. fig. 5, 1687. — 

 Pulex arborescens, Swammerdam, Biblia Natures, p. 86. tab. 31. fig. 1. 



3, 1737. Bradley, Philosoph. Account of Works of Nat. p. 202. pi. 25. 

 fig. 5, 1739. — Monoculus Pulex arborescens, Linnceus, Syst. Nat. edit. 



4. p. 96, 1744. — Puceron branchu, Trembley, Mem. pour servir a, I'Hi- 

 stoire d 'un genre de Polypes d'eau douce, p.92.pl.6.fig.3. p. and fig. \\, 

 1744. — Monoculus pulex arborescens, Linnceus, Fauna Suecica, p. 344, 

 1746. — Water Flea with branched horns, Baker, Emp.for Micros, p. 

 302. pi. 12. fig. 14, 1 753. — Pou aquatique*, Joblot, Observ. d'Hist. Nat. 

 8fctom.'\.part2. jp. 105. pl.13. fig.F. Q.R, 1754. — Geschwantzer-zack- 

 iger Wasserfloh, Schceffer, Die grun. arm. Polyp. 8fc. tab. 1. fig. 1 — 8, 

 1755. — Monoculus Pulex, Poda, Insect. Mus. Grcecens. p. 124, 1761. 

 Ledermiiller, Mikroskopischen Gemuths-und Augen-ergotzung, p. 146. 

 tab. 75. fig. 2, 1763. — Le Perroquet d'eau, Geoffroi, Hist. Abreg. des 

 Insectes, t. ii. p. 655. no. 1, 1764. — Monoculus Pulex, Muller, Faun. 

 Insect. Fridrichsdalens. p. 95, 1764. — Branchipus conchiformis primus, 

 Scheeffer, Element. Entom. t. 29. fig. 3, 4, 1 766. Goeze, Naturforscher, 

 part 7, 1775. — Daphne Pulex, Muller, Zool. Dan. Prod. p. 199. no. 

 2400, 1776. — Monoculus Pulex ramosus, De Geer, Mem. pour serv. fyc. 

 t. vii. p. 442. pi. 27. fig. 1 — 4, 1778. — Monoculus Pulex, Blumenbach, 

 Handbuch der Naturgeschichte, p. 399, 1779. Eichhorn, Beytrdge zur 

 Naturgeschichte, fyc. p. 51. t. 5. fig. H, 1781. — Daphnia pennata, Mul- 

 ler, Entomostraca, pl.\2.figA — 7, 1785. — Monoculus Pulex, Manuel, 

 Encyc. Method. Hist. Nat. t. vii. p. 722. no. 15. pi. 265. fig. 1 — 4, 1792. 

 Fabricius, Entomol. System, torn. ii. p. 491, 1793. Latreille, Hist. 

 Nat. gen. et part, des Crust, fyc. t. iv. p. 223, 1802. Encyclopedia 

 Britannica, art. Entomology, 1810. — Daphnia Pulex, Lamarck, Hist. 

 Nat. des Anim. sans Verteb. t. v. p. 126. no. 1, 1818. Samouelles 

 British Insects, p. 80, 1819. — Monoculus Pulex, Jurine, Hist, des Mo- 

 noc. 8fc. p. 85. pi. 8. fig. 1,2. pi. 11. fig. 1, 3, 5, 1820.— Daphnia Pulex, 

 Straus, Mem. du Mus. d'Hist. Nat. torn. v. pi. 29, 1821. Desmarest, 

 Consid. Gen. sur les Crust, p. 372. pi. 54. fig. 3, 4, 1825. 



* This is quoted by Straus as identical with his D. macrocopus. 



