. Bulletin of the British Museum (Natural History), Geology. 56 SOME LOWER CRETACEOUS TEREBRATELLOIDEA V. celtica (Morris) which it somewhat resembles. The typical form occurring at Shanklin, Isle of Wight reaches a maximum length of 23 mm., a width of 17 mm. and attains an average thickness of 11 mm. Lectotype. Meyer (1864 : 249) first described the species as Terebratula moutoni- ana Lancaster and later (1868 : 269) re-described it under the binomen Waldheiniia morrisi referring to the figured specimens (1864 : figs. 12-14) of his earlier work. Two of the specimens figured by Meyer (figs. 12
. Bulletin of the British Museum (Natural History), Geology. 56 SOME LOWER CRETACEOUS TEREBRATELLOIDEA V. celtica (Morris) which it somewhat resembles. The typical form occurring at Shanklin, Isle of Wight reaches a maximum length of 23 mm., a width of 17 mm. and attains an average thickness of 11 mm. Lectotype. Meyer (1864 : 249) first described the species as Terebratula moutoni- ana Lancaster and later (1868 : 269) re-described it under the binomen Waldheiniia morrisi referring to the figured specimens (1864 : figs. 12-14) of his earlier work. Two of the specimens figured by Meyer (figs. 12,13) were stated to have been collected from the Pebble-bed of Shanklin, while the other (fig. 14) was said to have come from the Pebble-bed of Godalming, Surrey. These specimens, here regarded as syntypes of V. morrisi, are in the Sedgwick Museum, Cambridge and are registered as B. 14770-71 and B. 16785. The lectotype, here selected, is It was originally figured by Meyer (1864, pi. 12, fig. 13) and was collected from the Pebble-bed, Parahoplites nutfieldensis Zone, Shanklin, Isle of Wight. o. Fig. Fourteen transverse serial sections througli tlie umbo of Vcctella morrisi (Mej'er) from the Upper Aptian, Shanklin, Isle of Wight. BM. X2. Material. Apart from the type specimens mentioned above, there are forty-two specimens in the Sedgwick Museum, Cambridge, twenty-nine from Shanklin and thirteen from the Bargate Pebble-bed of Godalming, Surrey, registered B. 16838-50, B. 14761-69, B. 14776-89. Also there are fifty-four specimens in the general collec- tion and Davidson Collection of the British Museum (Natural History) registered , , , , Remarks. A smaller form of V. morrisi, though with similar proportions, occurs in the Bargate Pebble-beds of Surrey and beds of equivalent age at Brickhill, Bucking- hamshire. The latter has often been confused with TamareUa juddi (Walker) but differs from this species in its more re
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