254 Mr. Baird on British Entomostraca, 



described, and immediately after the fourth moulting we see 

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

 remain till fully hatched. 



Species. 



I. Dapkma Pulex. Valvulis longe caudatis; capitc magno ; rainis phi- 

 mosis; Begmente corporis sexto quatuor lobulia instructo. 



Hab. Ponds and ditches. Common. 



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

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

 Rcr. Nat. Briton, p. 207, 1677. — Animaletti aquatici, Redi, Osserva- 

 zioni, tab. 16. fig. 5, 1684. Red/, Opere, vol. ii. tav.!6.fig.b, 1687. — 

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



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

 fg. 5, 1739. — Monoculus Pules arborescens, Linnceus, Syst. Nat. edit. 



4. p. 96, 1744. — Puceron brancliu, Trembley, Mem. pour servir a V Hi- 

 stoire d'un genre de Polypes d'eau douce, p. 92. pi. 6. fig. 3. p. and fig. 1 1 , 

 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, 1753. — Pou aquatique*, Joblot, Observ.d'Hist. Nat. 

 8fc. torn. i. part 2. p. 105. pi. 13. fig. P. Q. R, 1754. — Geschwantzer-zack- 

 iger Wasserfloh, Schcejfer, Die grim. arm. Polyp. Sfc. 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. fg. 2, 1763. — Le Perroquet d'eau, Geqffroi, Hist. Abreg. des 

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

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

 Schceffer, Element. Fntom. t. 29. fig. 3,4, 1766. Goeze, Naturforscher, 

 part 7, 1775. — Daphne Pulex, Midler, 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. Eichhom, Beytrage zur 

 NaturgescJiicJite, fyc. p. 51. t. 5. fig. H, 17S1. — Daphnia pennata, Mid- 

 ler, Entomostraca, pi. 12. fig A — 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. Samouelle 's 

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

 noc. §c. p. 85. pi. 8. fig. 1, 2. pi. 11. fig. I, 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. 



