8 Dr. T. Scott on sown 



the inner distal angle produced into a strong spine that 

 reaches beyond the end of the third joint ; this joint is small 

 and is provided with four short sette on its inner margin and 

 two at the lower end of the outer margin, and the terminal 

 spine is long and tolerably stout, and fringed with minute 

 hristles along its inner edge (fig. 4>). 



Fam. Calanidae. 

 Genus Drepanopus, G. S. Brady, 1883. 



Drepanopus pectinatus, G. S. Brady. 

 (PI. II. tigs. 10, 11.) 



A number of specimens of this Drepanopus occurred in a 

 tow-net gathering collected in the vicinity of the Islands 

 on November 1909. Both males and females were fairly 

 numerous, and several of the latter carried ovisacs. The 

 same species was also present in another gathering collected 

 a few days afterwards 3 miles south-eastward of Speedwell 

 Island ; and specimens also occurred in a third gathering in 

 which were numerous larval decapods. One or two of the 

 larger females with ovisacs measured about 2^ mm. in length. 

 A few small and apparently adult specimens occurred, 

 which at first were considered as probably belonging to 

 D. fvrcipatus, Giesb., but on a careful examination of these 

 no anatomical differences of sufficient importance to separate 

 them were revealed. 



Fam. Acartiidae. 



Genus Acartia, Dana, 1846. 



Acartia tonsa, Dana. 



This was the only Acartia observed in the marine tow- 

 net samples. It was tolerably frequent in the gathering 

 containing the larval decapods already referred to under 

 Drepanopus. 



Cyclopoida. 



Fam. Oithonidse. 



Genus Oithoxa, Baird, 1843. 



Oithona helgolandica, Claus. (PI. I. fig. 12.) 



1863. Oithona helgolandica, Claus, Die Frei Lebenden Copepodeii, 



p. 105, pi. xi. figf>. 10-12. 

 1860. Oithona similis, Claus, Die Copepoden-Fauna von Xizza, p. 14. 



