COPEPODA. 
Crust . 27 
only one stage in a pool and another in the next, only a few feet apart ; 
intensity of colouration does not depend upon season but the condition of 
the water, which may or may not be influenced by the time of the year. 
D. giganteus, sanguineus, and stagnalis (Forbes) must all be referred to 
D. castor. D. pallidus (Herrick), with sicilis (Forbes), constitutes a second 
distinct species. Herrick, Am. Nat. xvii. pp. 381-383, pi. v. figs. 1-9. 
Diaptoinus ? Iccntuclcyensis , sp. n., Chambers, J. Cincinn. Soc. iv. 
p. 49. 
Diaptoinus. Note on its development ; B. Ssekely [title, supra]. 
Osphranticum [soo Zool. Roc. xix. Crust, p. 37] diffors from Diap - 
tomus by the fifth pair of legs in both 'sexes being biramose and armed 
with plumose cilia. 0. labro-nectum , sp. n., Lake Michigan. Forbes, Am. 
Nat. xvi. [1882] p. 645, pis. viii. figs. 24, 28, & 29, & ix. figs. 1, 2, 4, 5, 7, 
& 9. 
Epischura, g. n. Abdomen distorted, unsymmetrical, its last three 
segments being laterally produced into a grasping organ in the male ; the 
lateral process of the two former acting against each other as a powerful 
pair of nippers, and the latter bearing a stout toothed plate. E. lacustris , 
sp. n., Lake Michigan. Id. 1. c. pp. 540 & 647, pis. viii. figs. 15, 16, 21-23, 
& 25-27, & ix. fig. 8. Generic characters formulated, and E. Jluviatilis, 
sp. n., also from North America, added ; C. L. Herrick, op. cit. xvii. 
pp. 384 & 385, pi. v. figs. 10-20. 
Acartia denticornis , sp. n., Brady, Copep. ‘Challenger,’ p. 73, pis. xxxi. 
fig. 1, & xxxii. figs. 12-17, sea near the Sandwich and Philippine Islands. 
Corynura, g. n. Near Candace ; right anterior antenna of the male 
provided with serrated plates ; maxilla destitute of a palpus, composed 
of a stout setiferous base, and a slender one-jointed apical portion ; foot- 
jaws near those of Acartia ; caudal stylets much elongated and dilated at 
the tips. C. gracilis and barbata, spp. nn., sea off the Philippines. Id. 
1. c. pp. 70 & 71, pis. xxxi. figs. 10-12, & xxxiii. 
Pontellopsis , g. n. Abdomen of female two-jointed, and having a 
pouch-like protuberance on the left side ; primary branch of posterior 
antennae three- jointed, secondary branch small, indistinctly four-jointed ; 
mandible-palp composed of a moderately large basal joint and two small 
branches composed of several joints ; malo unknown. P. villosa , sp. n., 
Northern Pacific and Southern Atlantic. Id. 1. c. pp. 85 & 86, pis. xxxiv. 
figs. 10-12, & xxxv. figs. 14-20. 
Pontella (Dana), Monops , and Labidocera (Lubbock) cannot be kept as 
distinct genera ; P. Icevidentata , Philippines, hrasyeri, Arafura Sea, and 
Philippines, elephas , Philippines, inermis, South Atlantic, and securifer, 
Mid Pacific, spp. nn. ; id. 1. c. pp. 87-96, pis. xxxviii., xxxix., & xlv. 
figs. 1-15. 
Boeclcia , g. n., Thomson, Tr. N. Z. Inst. xv. p. 93. Allied to Isias 
(Boeck) and Cenlropages (Kroy.), but all five pairs of swimming feet two- 
branched ; fifth pair with both branches three-jointed in the female, 
and outer branch two- jointed in the male, with a long terminal curved 
claw. B. tri-articulata, sp. n., p. 94, pi. vi. figs. 1-9, Eyreton, N. Can- 
terbury. The author adheres to the generic name, as Brady’s Boeclcia has 
lapsed. 
