REVISED REPORT ON L.M.B.C. COPEPODA. 93 



careful dissection of one failed to reveal the presence of 

 posterior foot jaws, so if present any description of these 

 appendages must await the capture of more specimens. 

 Inner branch of first pair of swimming feet (fig. 8) two 

 jointed, the inner side of apical joint being produced into 

 a long digit-shaped spine with rounded end. The outer 

 branch of first pair and both branches of second, third, 

 and fourth feet and of the fifth feet of male are all three 

 jointed, the inner terminations of the first and second 

 joints of the inner branches of the second and fourth feet 

 (fig. 10) forming strong beak like spines. The fifth feet 

 of the female (fig. 11) are two jointed, the second being 

 more than twice the length of the first and bearing three 

 lateral and three apical spinous setao. The fifth feet of 

 the male (fig. 12) are alike and both three jointed. Abdo- 

 men six jointed with sharply pointed lateral terminations 

 to the second, third and fourth segments. Caudal stylets 

 very long and narrow, swollen at the upper end and 

 gradually widening to the base, with outer lateral setae one 

 on each near the end and having several terminal setae. 



Two specimens only, a male and female of this remark- 

 ably elegant but minute species were taken by the mud 

 dredge at 39 fathoms in the Irish Sea about twelve miles 

 out from Port Erin. I feel a peculiar pleasure in connec- 

 ting the name of the genus with that of my friend Prof. 

 Herdman. 



Family IV. — Cyclopid^. 

 Oithona spinifrons, Boeck. (PI. XVII, fig. 1.) 

 Length 1 mm. Generally present in townet gather- 

 ings throughout the year. It is easily recognized by its 

 dehcate whip like antennae clothed with long setae. 

 Cyclopina littoralis, Brady. (PI. XVII, fig. 2.) 

 Length 0.75 mm. Frequently found amongst sea-weeds 

 between tide marks about Puffin Island. Though seldom 



