The British Oceanic Entomostraca. 23 



hand, bearing a single long bristle on the centre of its inner, 

 slightly serrated edge. 



Thalestris longimana, Olaus. Claus, Die frei lebenden Cope- 

 poden, p. 130, t. xviii., figs. 1 — 11. 



The genera Thalestris and Dactylopus are closely allied to 

 Canthocamptus, from which they have been separated by Dr. 

 Claus, in his recently published, work on the Copepoda of 

 Germany, the North Sea, and the Mediterranean. The follow- 

 ing are the more important characters of the genus Thalestris. 

 Lower foot-jaw armed with a strong prehensile hand ; superior 

 antennas mostly with nine articulations; branches of the first 

 pair of feet much elongated, prehensile ; posterior feet of the 

 female leaf-shaped, covering the ovisac. T. longimana is a fine 

 species, richly coloured with deep brown and red. Its most 

 remarkable feature is the largely developed chelate lower 

 foot-jaw, which forms a very formidable and effective grasp- 

 ing apparatus. This is shown at Fig. 2. The first feet are 

 very much elongated, and armed with long slender claws 

 which, from their position, must be admirably adapted to co- 

 operate with the antennas and foot-jaws in the work of seizing 

 and securing prey. The only British locality known to me 

 for this species is Sunderland, where I have taken it in shallow 

 tidal pools. 



Harpacticus cheliper, Miiller. Claus, Copepoden, p. 133, t. 

 xix., figs. 12—20. 



The species which I have usually considered to come 

 under this designation is, as stated above, Dactylopus tisboides. 

 The only examples I have hitherto seen of the true H. chelifer, 

 are a few taken near Sunderland a year or two ago. 



Peltidium purpureum, Philippi. White, Pop. Hist. Brit. 

 Crust., p. 308, plate xviii., fig. 4. 



The family Peltididw, of which this species is the type, is 

 very different in general appearance from the Harpactidce, 

 being much broader and flatter, ' and less adapted for active 

 movement in the water. They may often be met with on the 

 fronds of Fuci and Laminariae in tide pools, but some of them 

 are taken by the towing net in the open sea. 



Of this species, I have seen only one specimen taken in a 

 tide pool near Sunderland. Mr. Spence Bate has taken it on 

 the south coast of England. 



Hersilia apodipormis, Philippi. White, Pop. Hist. Brit. 

 Crust., p. 308. 



I know nothing of this, except from the description re- 

 ferred to above. It has been taken in Britain only by Mr. 

 Spence Bate. 



Alteutha depressa, Baird. Baird, Brit. Entom., p. 216, 

 plate xxx., figs. 1, 2, a, b. 



