Page:Transactions NZ Institute Volume 15.djvu/127

In the N.Z. Inst. Trans., Vol. XI., pp. 258–259, I described two species of Entomostraca belonging to the Order Copepoda—viz., Cyclops novæ-zealandiæ and Arpacticus bairdii. I had numerous other forms in my collection at the time, but, from want of text-books on this little-known order, was unable with any certainty to work them out. This difficulty having been in great measure overcome, I am now enabled to contribute a little information to our knowledge of this interesting group of animals.

The forms described in this paper have been obtained from only a few situations, the marine species being either from rock-pools or shore-kelp along the coast, or taken by the dredge in Otago Harbour at a maximum depth of 6 fathoms. Small as the number of species already identified is, they show a remarkable approximation to European forms. As the literature of the subject is not readily accessible to members of the N.Z. Institute, I make no apology for introducing generic characters. The classification followed is that adopted by Brady in his beautiful "Monograph of the British Copepoda," recently issued by the Ray Society.

Of the 8 families represented in the British fauna, I have only met with representatives from 4—namely, Calanidæ, Cyclopidæ, Harpacticidæ and Artotrogidæ.

Eye single, composed of several lenses; thorax and abdomen long and slender; rostrum (if present) slender, and usually fuscate; anterior antennas 24–25-jointed.

Body elongated, compressed; head not distinct from thorax. Abdomen consisting of five segments in the male, and of three in the female. Right anterior antennæ of the male geniculated. Posterior antennæ two-branched, the secondary branch having four small intercalated median joints. Mandibles large, with a sharply toothed cutting portion, and a broad palp; the latter bears two branches, one four- and the other three- (or two-) jointed. Maxillæ furnished with numerous strong marginal plumose setæ. Anterior