24 Illinois State Laboratory of Natural History 



Fk;. 4. — Lon^itiulinal section of plankton bucket. X 1. 



h. Bottom. 'pl. 



Jia. Base. pi. 



h. c. Band clamp. s. 



d.p. Drip-point. sc. 



e. Eye. sh. 

 Thread, screwing on m, w. 



Fig. 3. x-y. 

 Plus- 



Fj(i. 5. — Cross-section of plankton bucket at x-ij, Fig. 4. X 1 

 ing as in Fig. 4. 



n. 



P- 



Plats of clamp. 

 Pillar. 

 Silk. 

 Screw. 

 Shoulder. 

 Window. 



Line of section shown 

 in FifiT. 5. 



Letter- 



Plate hi. 



Fro. G. — Carriage, with suspended plankton 

 (( f> c. Line of separation of s. 



carriage. s.l.l,s.l2,s.l.3. 

 Iiti. Bucket. 



c. r. Carriage rope. s. I. 4. 



d. I. Draw-line. sn. 

 h. Hook. th. 

 k. End knot. w. s. 

 I. Lead. w x y z. 



p. Front pulley. 

 ]).' Kear pulley. 

 Fi(i. 7. — Operation of the obliiiue haul. X jK- 



e. s. End stake. 



m. 30-meter knot. 



in. s. Main stake. 



n. Net before release. 



??,.' Xet after release. 



r. I. Release line. 



sur. Surface of water. 



net. X h 



Staple. 



Stay-lines from the draw 

 line to net and bucket. 



Stay-line to carriage. 



Snap. 



Thread. 



Wire staj'. 



Screw-eyes for attach- 

 ment of net. 



h. r. 



h. s. 



ht. 



c. r. 



d, I. 



Brace rope. 



Brace stake. 



Boat. 



( 'arriage rope before 



release. 

 Carriage rope after 



release. 

 Draw-line. 



Plate IV. 



Fkj. 8. Plankton net used with the pump, shown in longitudinal 



section. X ^4. 



/>. I. Butchers' linen. 0. n. 



con. Connector. p. 



cov. Cover. 7-i. 



f. Foot. St. 



n. Float. t. h. 



h. Handle. t. s. 



I.e. Inner cone or spreader. tr. 



i. 71. Inner net. ro. 



Outer net. 



Pivot for sujiport of ring. 



Ring for inner net. 



Stay for inner cone. 



Turn button. 



Turn support. 



Trough. 



Wing. 



