Keywords: Halaelurus canescens 001.jpg Halaelurus canescens http //www archive org/details/reportondeepseaf00gn Report on the deep-sea fishes collected by H M S Challenger during the years 1873-1876 Günther Albert C L G Albert Carl Ludwig Gotthilf 1830-1914 1887 R Mintern PD-old Report of the Challenger deep sea fishes Halaelurus canescens Scyliorhinidae heads |