Dr. Arthur Roice — Actinocatnax at Walmer, etc. 79 



V. AOTINOOAMAX VERUS IN THE IJPPER PaET OF THE MlCBASTER 



COR-ANaUINUM ZoNE AT WaLMEE, AND St. MaRGAKET AT ClIFFE. 

 By Dr. Arthur W. Eowe, F.G.S. 



THE known occurrences of Actinocatnax verus in this zone are 

 comparatively few. Northfleet in Kent, Micheldever in Hampshire, 

 and Great Fimber in Yorkshire are our only records. 



When we were examining the cliff between Kingsdown and 

 St. Margaret's Bay we searched for it in vain. In November, 1901, 

 however. General Cockburn showed us several examples which he 

 had obtained in the pits by the waterworks at Walmer, together with 

 the fossils associated with them. From an inspection of the latter we 

 had no doubt that they were derived from the upper part of the 

 Micraster cor-anguinum-zone rather than from the Uintacrinus-\)a,ndi. 

 However, to place the matter beyond doubt, we went to Walmer and 

 found that the pits were hewn in massive chalk, with regular bands 

 of compact black flints, corresponding in every way to those on the 

 coast at Kingsdown. 



From these pits we obtained two examples of Actmocamax verus, the 

 characteristic shape-variation of JEchinocorys scutatus, Micraster cor- 

 anguinum and the var. latior, Conulus conicus and C. alhogalerus, the 

 characteristic head and colummars of Bourgiielicrinus, and Cidaris 

 perornata. 



There is a pit at East Yalley Farm, on the 200 feet contour-line, 

 and a mile north of St. Margaret at Cliffe. The flints are in bands, 

 and not very numerous, but they are more irregular than those found 

 in the Uintacrinus -hand, and have thick white cortices. From the 

 lithological standpoint we should infer that we were in the highest 

 part of the Micraster cor-atiguinum zone, and at a higher level than 

 the Walmer pits. A. long and careful search failed to demonstrate 

 the presence of Uititacrinus. We found Aetinocamax verus, the 

 characteristic shape-variations of Echinocorys and Bourgueticrinus, 

 Conulus conicus, Micraster cor-anguinum, Cyphosoma Konigi, Cidaris 

 perornata, C. clavigera, C. hirudo, C. sceptrifera, Kingena lima, 

 Notidanus microdon, and Porosphcera glohularis, of the size associated 

 with the zone in question. There was no sign of the " Whitaker 

 3-inch band " or of the " Barrois sponge-bed." 



It may be of interest to those who follow the distribution of 

 Cephalopoda in this zone to mention that since the publication of 

 the paper on Kent and Sussex we have found four Ammonites of the 

 leptopliyllus group in falls from the Micraster cor-anguinum-zone on 

 this coast. We have also seen one in situ at Joss Bay, Kingsgate, 

 Thanet, 10 feet below the "Whitaker 3-inch tabular band," and 

 therefore 21 feet below the junction with the Uintacrinus -hand. We 

 know also of four examples in the Northfleet pits. 



We put on record these zonal notes in the hope that those resident 

 in the Dover area will extend our obviously sketchy and imperfect 

 examination of the district. Indeed, the work was done in a few 

 brief hours snatched from the more important examination of the 

 cliffs, and but for the able assistance of General Cockburn would not 

 have been worth publishing. 



