Records of the Indian Museum. Vol. XLIX Part I Pp. 89-137. an Aid to the Identification Of The Fishes Of India Burma And Ceylon. I. Elasmobranchii And Holocephali

I. Elasmobranchii and Holocphali " has been modelled after Part I of the " Check List " series.' The preparation of the key is based on the examination of a large series of examples of cartilaginous fishes consisting of both the type and collateral specimens preserved in the collections of the Zoological Survey of India and on the observations and morphological data gathered on these groups of [...] XLIX 3. Length of head is measured from the tip of snout to the anterior edge of the first gill-openings (except in the case of chimaeras in which th6 length of head is measured Lis in the bony fishes). [...] Head flatly depressed : teeth pentacuspid or tricuspid : base of anal fin distinctly longer than the base of second dorsal fin.... Subgenus Halaelaras. [...] Lateral view of Scyliorhinus (Scyliorhinus) capensie (after Day b. Lateral view of Scyliorhinus (lialaelurue)hiapidum : X ; c. Ventral view of head of same : X ; d. Upper teeth of same : X 31 ; e. Lower teeth of same : X 26. [...] 1. First dorsal larger than the second dorsal.. 2. First dorsal not larger than the second dorsal.. 3. First dorsal smaller than the second dorsal : nasal cirri well developed.. 4. First dorsal and second dorsal subequal : nasal cirri absent or rudimentary 5. Origin of first dorsal above the middle of the ventral bases : transverse bands spotted with black 6. Origin of first dorsal a little