CTCLOPINA. 93 



the rest. Abdomen long and slender, the last two 

 joints about as long as broad and shorter than either 

 of the preceding two ; caudal segments (fig. 9) slender, 

 about four times as long as broad ; the innermost of 

 the two median tail setaB is nearly twice as long as the 

 outer, the other two setse very short ; the caudal 

 segments bear also a seta on the external margin not 

 far from the base. Length ^ 5 - th of an inch (*75 mm.). 

 C. littoralis, though distributed pretty generally 

 round the coasts of Britain, has never been found in 

 abundance, seldom more than one or two specimens in 

 a gathering. It is, however, a very well-marked and 

 distinct species and apparently quite different from 

 those described by MM. Boeck and Claus. I have 

 found it amongst weeds between tide-marks on the 

 coasts of Northumberland and Durham (Whitley and 

 Byhope), and in the same district in depths of 4 — 45 

 fathoms ; amongst the Scilly Islands in 14 fathoms ; 

 in Lough Swilly in 2 fathoms ; and in Mulroy Lough 

 (Donegal) in 16 fathoms. 



2. Cyclopina gracilis, Glaus. PI. XXIV b, figs. 1 — 9, 

 and PI. XCI, figs. 10, 11. 



Cyclojohm gracilis, Claus. Die frei-lebenden Copepoden, p. 104, 

 taf. x, figs. 9—15 (1863). 



Body oblong-ovate, with a long and slender abdo- 

 men (fig. 9). First abdominal segment in the female 

 nearly as long as the following three ; last segment 

 very short, about half as long as the furca, the 



G 



