[currie] plankton COPEPODS 221 



Fig. 31. C.finmarchicus \'-\'l. Exuviation of urosome. 



Fig. 32. Same. Distal joint of Re of left p5, showing the internal obpyriform 

 joint of stage VI. 



Fig. 33. Same. Distal joint of Re of right p5. 



Fig. 35. C. finmarchicus V. Distal joint of Re of p5 showing only two Se. 



Fig. 36. Eurytemora herdmani. First (immature) form of female showing one of 

 the postero-lateral angles of the forebody and the urosome. 



Fig. 37. Eurytemora herdmani. Second (mature) form of female. 



Fig. 38. Eurytemora herdmani. 1. Fifth feet. 



Fig. 39. Eurytemora herdmani. 2. Fifth feet. 



Fig. 40. Eurytemora herdmani. I-II. Exuviation of the right postero-lateral 

 angle of forebody. 



Fig. 41. Eurytemora herdmani I-II. Exuviation of p5. The serrated claw of 2 is 

 seen within the smooth claw of 1. 



Fig. 42. Eurytemora herdmani. Terminal joint of right of p5, showing a distal 

 ridge instead of a plumose seta. 



Fig. 43. Tortanus discaudattis I. Posterior pait of forebody and urosome from 

 above. 



Fig. 44. Same. Fifth foot showing spinules on the ramus. 



Fig. 45. Tortanus discaudatus. 2. Urosome in side view showing clump of cilia 

 on the right side of the second segment and an area of pubescence on 

 the right caudal ramus. 



Fig. 46. Tortanus discaudatus. 2. Urosome showing row of cilia at inner mar- 

 gin of right caudal ramus. 



Fig. 47. Tortanus discaudatus. 2. Fifth foot showing absence of spinules on the 

 ramus. 



Fig. 48. Acartia clausi. Genital segment, showing spermatophore held by p5. 



Fig. 49. Acartia clausi. Fifth feet. 



Fig. 50. Same. Part of left p5, showing slender and stout cilia on terminal spoon- 

 shaped point; two clumps of cilia on third joint. 



Fig. 51. Same. Distal joint of right p5, showing two distal clumps of setae. 



Fig. 52. Acartia longiremis. Fifth feet and postero-lateral spines. 



Fig. 53. Pseudocala?iis elongatus. Rudimentary p5. 



Fig. 54. Pseudocalanus elongatus V. Immature p5. 



Fig. 55. Metridia lucens IV. Immature p5. 



Fig. 56. Metridia lucens IV. Immature p5. 



Fig. 57. Metridia longa V. Immature p5. Distal setaî omitted from right leg in 

 the figure. 



Fig. 58. Metridia longa. V. Immature p5. 



Legends for Graphs 

 Graph I. C. finmarchicus IV. 

 Bimodal curve showing length variations of 116 individuals from "Prince" 

 Sta. 3, June 28th, 1916, 10 fathom tow. 



Gr.vph 2. C. finmarchicus IV. 

 Curve showing variation in number of coxal teeth in the 116 individuals em- 

 ployed in graph I. 



Graph 3. C. finmarchicus IV. 

 Curve showing correlation between length and coxal teeth in the series employed 

 in graphs 1 and 2. 



Sec. IV, Sig. 16 



