ME. T. SCOTT ON ENTOMOSTEACA 



Part I. 

 COPEPODA. 



The material from which the Copepoda noticed in this Report were ohtained w^as 

 collected chiefly hy means of tow-nets worked at the surface and at various depths 

 (under surface) from 2 to 460 fathoms, and a few were shore gatherings. 



The material was contained in 149 hottles, which represented ahout as many separate 

 gatherings. 



Lists of species ohtained in some of the more important gatherings are appended to 

 these introductory remarks {vide p. 13). 



Comparatively few of the species were generally distributed throughout the area 

 examined, or were of frequent or common occurrence in the tow-nettings. 



The following were among the most common and most widely distributed species in 

 the collection : — Eacalanus attenuatus, Bldncalanus cormitus, TJucUna vulgaris, EiichcBta 

 mariua, Temora stylifera, Corycmus varius, Corycceus speciosus, and Onccea obtusa. On 

 the other hand, a considerable number of species, though obtained in gatherings from 

 localities all over the area examined, were uncommon or rare in the collections in which 

 they occurred — Eucalanus setiger and Pleuromma abclominale may be given as examples. 

 Other species, though observed in comparatively few gatherings, were yet moderately 

 common in those in which they did occur — Kemicalanus longicoriiis is a striking 

 example of this. Tliis species was observed in comparatively few gatherings, but in one 

 of these no fewer than 80 fairly perfect specimens were obtained ; in contrast to this, it 

 may be stated that scarcely half a dozen sjoecimens of Ilemicalani were observed in the 

 whole of the ' Challenger ' collections. Several species, as Acartia sinnicaudata, Olthona 

 miuuta, Amyriione Andreici, Ilyopsyiliis affiiiis, and some other Harpactids, were obtained 

 in gatherings from inshore and brackish-water localities, as, for example, from a shore 

 collection at Accra and at Sao Thome Island, and in surface-gatherings from Bananah 

 Creek at the mouth of the River Congo, and from Loanda Harbour. A few fish-para- 

 sites, including the pretty Messella, were also observed, and are described in this 

 Report, 



Many of the species occurred more frequently in the surface tow-nettings collected 

 during the night than in tliose collected^during the day, while in the under-surface tow- 

 nettings they were of more frequent occurrence in those collected during the day than 

 in those collected during the night. This will be observed by referring to the classified 

 list of species. 



