THORACIC CIRRIPEDES 

 COLLECTED IN 1925-1936 



By C. A. Nilsson-Cantell, Sweden 

 (Text-figs. 1-5) 



INTRODUCTION 



IN an earlier paper (Nilsson-Cantell, 1930) I have worked out the Cirripedes brought 

 home by the R.R.S. ' Discovery ', the R.R.S. ' William Scoresby ', and the staff of the 

 Marine Biological Station at South Georgia during the years 1925-7. For the oppor- 

 tunity to study further material from the same expeditions I have to express my best 

 thanks to the former director of the expedition, Dr Stanley Kemp. The greater part of 

 the material was collected during the years 1928-36, but some specimens from the 

 earlier expeditions are also included here, since they were not at my disposal earlier. 



Stations made by the ' Discovery ' are entered first in the list of localities under the 

 species headings and have no letters prefixed to the numbers. Those of the ' William 

 Scoresby ' follow and are distinguished as WS 80, etc. Where the material was collected 

 from whales, the serial number (No. 87, etc.) assigned to it by the Discovery observers 

 is given. A number of the specimens were taken from whales for which such data are 

 not available. 



The following symbols are used for nets, apparatus, etc., in accordance with Discovery 

 Reports, i, Station List: 



BNR A 100 cm. net attached to a frame 1-47 m. long and 38 cm. wide with skids on either side 



which keep the mouth of the net 15 cm. above the sea bottom. 

 BTS Small beam trawl. Beam 8 ft. in length (2-45 m.): mesh at cod-end I in. (12-5 mm.). All 



measurements are taken from knot to knot along one side of the mesh, not diagonally with 



the mesh stretched. 

 DC Conical dredge. Mouth 16 in. in diameter (40-5 cm.), with canvas bag. 



DLH Large dredge. Heavy pattern, 4 ft. in length (1-2 m.). 

 DRR A Russell net frame with rectangular dredge attached instead of a tow-net. 

 N 100 I m. tow-net. Mouth circular, i m. in diameter: mesh graded, with the cod-end made of 



stramin, with 11-12 meshes to the linear inch. 



,^^ ^ rJr Nets with mesh of 4 mm. or 7 mm. (o-i6 or 0-28 in.) attached to the back of trawl. 

 N 7-Tj 



N-T A fine meshed net attached to the back of the otter trawl. 



NCS-T Tow-net of coarse silk, with 16 meshes to the linear inch, attached to a trawl. 



NH Hand net. 



NR Rectangular net. 



OTC Commercial otter trawl. Head rope 80 ft. (24-5 mm.): mesh at cod-end i\ in. (3-8 cm.). 



OTL Large otter trawl. Head rope 40 ft. long (12-2 m.): mesh at cod-end i^ in. (3-2 cm.). 



RM Mussel rake. 



