. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Fig. 25. -Outlines of heads of: a, Pagrus anglicus ; and b, Pagrus gibbiceps,showing forward limit of scaling (diagrammatic). On the other hand, in examples from Natal, these spines are seeneven on first glance to be longer than in the majority of Cape speci-mens. On measurement they prove to be from |-1 length of thehead. Where then can one draw the line between the Cape and Natalforms ? Is it possible that temperature of the water can affect thegrowth of two (or three) spines ? It is not a question of age. Young an

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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Fig. 25. -Outlines of heads of: a, Pagrus anglicus ; and b, Pagrus gibbiceps,showing forward limit of scaling (diagrammatic). On the other hand, in examples from Natal, these spines are seeneven on first glance to be longer than in the majority of Cape speci-mens. On measurement they prove to be from |-1 length of thehead. Where then can one draw the line between the Cape and Natalforms ? Is it possible that temperature of the water can affect thegrowth of two (or three) spines ? It is not a question of age. Young and half-grown examples fromCape waters show short spines ; and a Natal specimen with long spineshas the wrinkled and protuberant forehead so often seen in typicalgibbiceps. With more extensive material I believe a complete transition wouldbe found between the short-spined and long-spined forms. 700 Annals of the South African Museum. Pagrus anglicus (G. and T.).Englishman. 1908. Gilchrist and Thompson, Ann. S. Afr. Mus., vol. vi, p. 172. 1917. Id., Ann. Durban Mus., vol. i,

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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory