. Bulletin of the British Museum (Natural History), Geology. . 0 1/2mm I 1 C Fig. 10 Dorsal scutes of double armoured herrings. A, Knightia eocaena Jordan (). B, Vect- ichthys vectensis (Newton) (). C, Hyperlophus vittatus (Castelnau). Recent, Australia. pterygiophores, the proximal ends of which do not reach the distal part of the vertebral haemal spines. Both the pectoral fins and girdle are imperfectly known. The pectoral fins are of moderate size and contain about ten rays. The cleithrum is generally well preserved. It is characterized by its large vertical arm and its relativ
. Bulletin of the British Museum (Natural History), Geology. . 0 1/2mm I 1 C Fig. 10 Dorsal scutes of double armoured herrings. A, Knightia eocaena Jordan (). B, Vect- ichthys vectensis (Newton) (). C, Hyperlophus vittatus (Castelnau). Recent, Australia. pterygiophores, the proximal ends of which do not reach the distal part of the vertebral haemal spines. Both the pectoral fins and girdle are imperfectly known. The pectoral fins are of moderate size and contain about ten rays. The cleithrum is generally well preserved. It is characterized by its large vertical arm and its relatively shorter lower arm. The supracleithrum is somewhat slender and articulates dorsally with the bifid post-temporal, the dorsal arm of which is longer than the ventral one. The pelvic fins are relatively small. Each contains seven rays (Newton, 1889, counted eight or nine rays but this number is clearly inaccurate). They originate midway between the pectorals and the origin of the anal. Their length is equal to about half the distance between their base and the origin of the anal. The pelvic bones are rather slender. Their length is about half that of the fin-rays. The body is covered with large cycloid scales marked with many circuli which show a largely vertical orientation, characteristic of clupeiform scales. There appear to be about 60-80 circuli per mm (). As noted by Newton, the lateral line is absent as in all clupeoids. There are about 40 vertical scale rows between the pectoral girdle and the base of the caudal fin. Between the dorsal and pelvic fins about eight longitudinal scale rows may be counted. Relationships. After its description by Newton (1889), Clupea vectensis was transferred by A. S. Woodward (1901) to the genus Diplomystus Cope. However, Jordan (1907) noted that Cope (1884) had earlier distinguished two sections within his genus Diplomystus. Jordan therefore proposed these sections of Diplomystus should each be considered a distinct genus, and tha
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