. The Cambridge natural history. Zoology. ACANTHOPTERYGII 70I finger-like appendages of the pectoral fins, which are employed to feel the ground in search of crustaceans and other small animals on which they feed; also for the grunting sounds which they utter by the contraction of the air-bladder. About 50 species are known, referable to 4 genera: Prionotus, Trigla, Lepidotrigla, Peristedion. Fossil remains referred to Trigla have been found in Miocene and later formations. British species are the Grey Gurnard (^Trigla gurnardus), the Eed Gurnard (T. cuculus), the Tub or Sapphirine Gurnard (T.
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. The Cambridge natural history. Zoology. ACANTHOPTERYGII 70I finger-like appendages of the pectoral fins, which are employed to feel the ground in search of crustaceans and other small animals on which they feed; also for the grunting sounds which they utter by the contraction of the air-bladder. About 50 species are known, referable to 4 genera: Prionotus, Trigla, Lepidotrigla, Peristedion. Fossil remains referred to Trigla have been found in Miocene and later formations. British species are the Grey Gurnard (^Trigla gurnardus), the Eed Gurnard (T. cuculus), the Tub or Sapphirine Gurnard (T. Tiirundo), the Piper {T. lyra), the Long-finned Gurnard {T. obscura), and the Streaked Gurnard (T. lineata). Fam. 11. Dactylopteridae. — Head completely cuirassed ; basis cranii simple ; parietal bones meeting on the median line; two nostrils on each side. Gill-cleft broadly separated by scaly isthmus; gills 4; pseudobranchiae present. Vertebrae 20-22 (8-9 -I- 12-13), the first very elongate and formed by the fusion. Fig. 426.—Dadylopterus volitam. (After Gill.) ^ nat. size. of three or four; ribs sessile, no transverse processes. Post- temporal fused with the skull; no supraclavicle; scapula and coracoid well developed, in contact with each other; pectoral rays divided into two parts, inserted on the scapula and on 4 elongate pterygials, of which 3 are in contact with the coracoid. Ventral fins close together, with 1 spine and 4 soft rays. Spinous dorsal shorter than the soft; anal without spines. Body covered with hard, rough scales. The "Flying Gurnards, " of which four species are known, belonging to a single genus {Bactylopterus), are inhabitants of the tropical and warm parts of the Atlantic and the Indian Ocean and Archipelago. They are remarkable, when adult, for the. 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