Catalogue of the fossil fishes in the British Museum (Natural History) .. . nd the accompanying restorations (fig. 33, A, B, C) are those of thelast-named author. Fig. A represents the dorsal aspect, and fig. Bthe ventral aspect, while fig. C is a side view. The exposed marginsof the plates of the trunk are shown by thickened lines, while theamount and direction of their overlap are indicated by the thinlines. Sensory canals, both upon the head and trunk, are markedby double dotted lines. We would only add that the large inferiorexpansion of the caudal fin is omitted in the third figure (compa
Catalogue of the fossil fishes in the British Museum (Natural History) .. . nd the accompanying restorations (fig. 33, A, B, C) are those of thelast-named author. Fig. A represents the dorsal aspect, and fig. Bthe ventral aspect, while fig. C is a side view. The exposed marginsof the plates of the trunk are shown by thickened lines, while theamount and direction of their overlap are indicated by the thinlines. Sensory canals, both upon the head and trunk, are markedby double dotted lines. We would only add that the large inferiorexpansion of the caudal fin is omitted in the third figure (comparePI. YI. fig. 3, x) ; and for the details of the hard parts in theorbital opening, reference must be made to some of the specimensdescribed below, notably the original of PI. Y. fig. 2. The cranial shield is small compared with the armour of the ASTEROLEPIDJE. 209 trunk, and, so far as known, is confined to the dorsal and lateralaspects. A large transverse opening, somewhat constricted mesially,occurs in the middle of the roof; and all the constituent plates of Fig. Pterichthys testudinarius, Ag. ; restored by R. H. Traquair, from the dorsalaspect (A), ventral aspect (B), and lateral aspect (C). In the last figurethe caudal fin is omitted. The double dotted lines indicate the groovesof the sensory canal-system ; and in the trunk, the thick lines repre-sent the exposed borders of the plate, the thin line showing theextent of the overlap, a., anconeal; , anterior dorso-lateral; ,anterior median dorsal; , anterior ventro-lateral; ag., angular; ar.,articular; c, central; , extra-lateral (or operculum); , lateraloccipital; m., marginal; , median occipital; , median ventral;mn., mental; , premedian; , posterior dorso-lateral; ,posterior median dorsal; , posterior ventro-lateral; , post-median ; &.I., semilur ar, PART II. P 210 the shield, except the postero-lateral pair, are firmly fixed together bysuture
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Keywords: ., bookauthorbritishmuseumnaturalh, bookcentury1800, bookdecade1880
