234 Part I1L,—Eleventh Annual Report 
Genus Peracantha, Baird. 
Peracantha truncata (Miiller). 
1781. Lynceus truncatus, Miller, Entom., p. 75, Pl. II. fivs. 4-6. 
1850. Peracantha truncata, Baird, Brit. Entom., p. 136, Pl. XVI. 
H@e le 
This also was one of the rarer species, and, like the two previous forms, 
was only obtained in the gatherings of bottom material. - 
Genus Leptorhynchus, Herrick. 
Leptorhynchus faleatus (G. O. Sars). (Pl. VII. fig. 30.) 
1861. Alona falcata, G. O. Sars, op. cit., p. 20. 
1862. Harporhynchus falcatus, idem, ibidem, Andet. Bidrag., 
p. 41. 
1884. Leptorhynchus faleatus, Herrick, Crust. of Minnesota, p. 114. 
The long slender curved beak of this species (fig. 30) enables 1t to be 
readily distinguishable. It was of frequent occurrence in the bottom 
material only; both males and females were obtained. The beak of 
Leptorhynchus falcatus is said to exceed in length that of any known 
species of Lyncied. Norman and Brady* record it from ‘Sweet-hope 
and Green Lee Lochs, Northumberland ; Lochend Loch, Kirkeudbright- 
shire ; and Lochmaben Castle Loch, Dumfriesshire ;’ and add, in ‘ all these 
localities it was numerically scarce.’ 
Genus Chydorus, Leach (1816). 
Chydorus sphericus (Miller). 
1776. Lynceus sphericus, Miiller, Zool. Dan. Prod., No. 2932. 
1816. Chydorus mutllera, Leach, Encyclop. Brit. Supp. Art. 
Annulosa. 
1863. Chydorus sphxricus, Baird, Ann. and Mag. Nat. Hist., vol. 
i. p. 89, t. 2, figs. 11-13. 
Frequent, and only in gatherings of bottom material, both from the 
head of the loch and from Brinacory. 
GYMNOMERA. 
Family PoLypHEemip#, Baird, 1845. 
Genus polyphemus, Miiller. 
Polyphemus pediculus (Linne). 
1746. Jonoculus pediculus, Linné, Taun. Suec., No. 2048. 
1776. Polyphemus oculus, Miiller, op. cit., No. 2417. 
1850. Polyphemus pediculus, Baird, Brit. Entom., p. 1. t. xvii, 
He Lt 
Taken in abundance with the tow-net, near the surface of the water, all 
over the portion of the loch examined. 
Genus Bythotrephes. 
Bythotrephes longimanus, Leydig. 
This species was frequent in the surface tow-net gatherings; it was also — 
* A Mon, of the Brit, Besmin,, Maeroth,, and Lynceide, p, 86, 
