. Bulletin of the British Museum (Natural History). 170 THE "ROSAURA" EXPEDITION General appearance (Text-figs, i and 2) Radial formula D. 16; + ; + ; + ; (L), 2(R). Branchiostegal rays 10. Gills 4. Myomeres of body 37. At first glance reminiscent of the larval Ceratioids, a minute fish with an overall length of 10-3 mm., transparent or translucent, scaleless and colourless save for a few isolated melanophores atop the head (Text-fig. 3) and on the caudal Text-fig. 3. Rosaura rotunda. Disposition of melanophores on dorsal surface of head, shown in relatio
. Bulletin of the British Museum (Natural History). 170 THE "ROSAURA" EXPEDITION General appearance (Text-figs, i and 2) Radial formula D. 16; + ; + ; + ; (L), 2(R). Branchiostegal rays 10. Gills 4. Myomeres of body 37. At first glance reminiscent of the larval Ceratioids, a minute fish with an overall length of 10-3 mm., transparent or translucent, scaleless and colourless save for a few isolated melanophores atop the head (Text-fig. 3) and on the caudal Text-fig. 3. Rosaura rotunda. Disposition of melanophores on dorsal surface of head, shown in relation to the brain and frontal bones. The greatest height is in the broad otic region. From this projects obliquely forwards and downwards the narrow ethmoid cartilage. The suspensorium is vertical, forming with the cranial axis and the jaws an equilateral triangle. Behind this the vertebral column with its myomeres descends obliquely to the posterior end of the almost spherical body-cavity and is continued as a short caudal region. The body-cavity is bounded in front by an almost vertically placed pectoral girdle, lightly curved forwards below, with the pectoral fins inserted about half-way in the height. The origin of the dorsal fin is substantially in advance of that of the much larger anal. An adipose fin is present. The caudal fin is large and fan-like. A prominent anal papilla is flanked by a pair of minute abdominal pelvic fins. The gill-openings are wide and bordered mainly by the branchiostegal membranes, which are continuous below (free from the isthnms), and supported by the much- reduced opercular and subopercular and by ten conspicuous, long, slender branchio- stegal rays. Pre- and inter-opercular bones are absent. The large mouth is bordered by toothed premaxillaries and dentaries with prominent caniniform teeth. The maxillaries are toothless and probably enter the gape only to a very limited extent. The eye is small for an oceanic fish and is widely se
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Keywords: ., 1955, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
