. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DISCOVERY REPORTS. ISO 50 NUMBER OF FIBRES Text-fig. 5. The percentage frequency of occurrence of muscle-fibre counts in the aggregate and solitary forms of 5. fusiformis (black solid), S. thompsoni (sohd line) and S. gerlachei (broken line). 125 100 S 75 25-, 30 • • • • • - ° .5 ° : 0° ••!• t 1. • •• • - • :: • • " 839 a - A^ a 9 A r r 1 1 < 1 1 35 40 50 55 DEGREES SOUTH bO 65 70 Text-fig. 6. Individual muscle-fibre counts of specimens of the sohtary form of S. fusiformis (A), S. aspera
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DISCOVERY REPORTS. ISO 50 NUMBER OF FIBRES Text-fig. 5. The percentage frequency of occurrence of muscle-fibre counts in the aggregate and solitary forms of 5. fusiformis (black solid), S. thompsoni (sohd line) and S. gerlachei (broken line). 125 100 S 75 25-, 30 • • • • • - ° .5 ° : 0° ••!• t 1. • •• • - • :: • • " 839 a - A^ a 9 A r r 1 1 < 1 1 35 40 50 55 DEGREES SOUTH bO 65 70 Text-fig. 6. Individual muscle-fibre counts of specimens of the sohtary form of S. fusiformis (A), S. aspera{o), S. thompsoni (•) and 5. gerlachei (a) plotted according to the latitude of the station at which they were taken. Note: observations for S. fust- j formis and S. aspera at stations north of 30° S. are not included. The data for S. aspera are insufficient to show the percentage frequency of occurrence as has been done for the other species. However, when the data plotted in Text-fig. 3 are compared with those of Text-fig. 4 it is seen that in fibre number S. aspera Hes roughly within the same range as S. thomp- soni. It is thus impossible to distinguish these two species on the basis of their muscle-fibre number but it will be remembered (Table i, pp. 14 and 15) that they can be distinguished in both aggregate and solitary form by differences in their muscle arrangement, and in addition, in the solitary form, by external diiferences in serrations of the test. As mentioned above there is overlap between the fibre counts for some of the species, as, for instance, between the solitary forms of S. fusiformis, S. thompsoni and 5. gerlachei (Text-fig. 5) and it might be argued that 5. gerlachei, characterized by fewer muscle fibres and thinner muscles (see. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly
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