PHYLLOPODV. 
Crust. 27 
(Fischer) is a degraded form of A. salina (L.), and can be produced by 
breeding several generations, each in somewhat more concentrated salt 
water ; in the spring of 1876, the saltwater of a lake near Eupatoria 
having been much diluted by great masses of snow, no true A. muel- 
hauseni made its appearance as usually, but only a form intermediate 
between it and salina. Meeting of Russian Naturalists at Warsaw, 
Sept., 1876, and Z. wiss, Zool. xxviii. p. 402. 
Apodid.®. 
Apus cancriformis (Schaff.), Lilljeborg, N. Act. Upsala (3) ix. A. p. 8, 
Vestrogothia, in Sweden. 
Apus dispar, Om-kenena, on the White Nile, 14° N. lat., sudanicus, 
same locality and Chartum, spp. nn. Both sexes in nearly equal number, 
the male has an additional segment, and the second and third pairs of 
feet stronger and transformed into grasping organs ; in .4. cancriformis, 
similar sexual differences can be found, but in a lower degree, and not in 
all individuals of the same sex. Brauer, SB. Ak. Wien, 1877, pp. 589-693, 
pi. i. 
Apus (subgen. Lepidurus) productus (Bose.), Sweden, glacialis (Kroyer), 
Lapland, Nova Zembla, Spitzbergen, Beeren Island, and macrourus,sp.n., 
Archangel, Lilljeborg, t. c. pp. 9-13. 
Limnadiid®. 
Limnadia lenticularis (Linn., as Monoculus) — gigcis (Herm.) ; Lillje- 
borg, 1. c. p. 16. Middle region of Sweden ; makes its appearance 
towards the end of the summer. 
Limnadia africana, sp. n., Tura-el-chadra, on the White Nile, males 
and females in about equal number; Brauer, SB. Ak. Wien, 1877, 
pp. 608-610, pi. vii. female, pi. viii. male. 
Limnetis hrachyura (Miill.), Lilljeborg, 1. c. p. 18, Archangel, Baltic 
provinces of Russia and Denmark ; has only one pair of maxillae. 
Streptocephalus watsoni, sp. n., Packard, Bull. U. S. Geol. Surv. iii. 
p. 176, Kansas. 
Thamnocephalus, g. n. A frontal inter -antennal shrub-like branched 
bi-ramous appendage ; male claspers curved and simple ; abdomen ter- 
minating in a spatulate fin-like expansion ; egg-sac of the female sub- 
conical, spreading out at the base. T. platyurus, sp. n., id. 1. c. pp. 174-176, 
woodcut, Kansas. 
Artemia fertilis (Verr.). Fecundated females are viviparous for one 
occasion, and then produce only eggs with thin shell ; non-fecundatod 
females produce eggs with thick shells, destined for hybernation. Males 
and females in about equal number are found among the descendants 
of the fecundated females by viviparity, as well as among the young 
hatched from the eggs with thick shell. V. Siebold, Verb. Ges. Bas. 1876. 
Polyartemia forcipata (S. Fischer), Karesuando, in Northern Sweden, 
also in Lapland and Northern Siberia ; Lilljeborg, N. Act. Upsal. (3) 
ix. A, p. 6. ' 
