658 REPORT — 1891. 



referred to, the value of the contemplated zonal divisions. I cannot say that I 

 shall be completely successful in my labours, but I may be able to lay founda- 

 tions OD which some one, far more competent than mj'self, may build advan- 

 tageously at least. If, however, I take two or three well-marked types of polyzoa 

 I shall be able to explain my meaninp; better. 



In 1864 Ignaz Beissel ' described and illustrated a peculiar species of 

 Enf,aloj)hora, which, on account of the delicate markings on the surface of the 

 zoarium, he named E. lineata, from the chalk mail of Friedrichburg. The species 

 was found in three different localities, and is marked ' rare.' When working out 

 my Cambridge Greensand material ' I found that one species in particular was 

 rather abundant, and, not having at the time any knowledge of Beissel's description 

 or species, I named the Ch-eensand form Ent(dophora striatopora, Yine.- In 1874 

 Dr. Reuss described and illustrated two species from the Quader Sandstone of 

 Strechlen, which he called Entalophora lineata Beiss., and Filisparsa ornata Reuss, 

 both of which are marked ' rare.' Two years before Reuss, in 1872, Stoleczka, in 

 his ' Paloeontologica Indica ' (iv. 2, The Ciliopoda), also described E. lineata from 

 the ' Arria loor gruppe bei Yermamoor in Ostandien.' In 1887, however. Dr. 

 Marsson ' introduced a new genus, Clinopora, for the inclusion of Beissel's species, 

 and also a new species in some respects similar to E. striatopora Vine, but not so 

 coarsely marked on the surface. These are : 



Clinopora costulata, Marsson . . , {Op. c'lt. p. 24, jjI. II. fig. 2) 

 ,, lineata, Beissel .... (id. „ „ „ 3) 



After submitting examples of my own species to Dr. Pergens, of Belgium, he 

 expressed the opinion that as the Cambridge Greensand form was the same as 

 Clinopora costulata, by right of priority the Riigen form should be characterised as 

 Clinopara striatopora Vine. For reasons which could be easily given I should 

 prefer to retain my own name, as given in the last British Association Report,' aa 

 Entalophora lineata Beissel, Var. striatopora Vine. 



There is still another very characteristic polyzoon found in the Cambridge 

 Greensand, and also in the chalk marl material from Charing, though not 

 previously recorded by me. This is the Eschara tenuis, Hag.,'' or the Epidictyon 

 tcnue, Marsson.^ The species is rare everywhere. Marsson records it from Upper 

 Turonian and Middle Senonian, Riigen, but it is present also in the English Chalk 

 of Salisbury (but rare), in the Eeleinnitella mucronata zone. The same species is 

 recorded by Reuss from the marl-beds of the Quader Sandstone of Saxony as 

 Lanceopora striolata Reuss." In the Cambridge Greensand the examples are 

 very strongly marked on the surface. 



In the Riigen example, and also in the Salisbury example, the surface lines are 

 distinct but faint, and, like Entalophora lineata and its varieties, the fades of the 

 various examples indicate, to some extent, the horizon from which they have been 

 derived. 



The presence of " Cretaceous" polyzoa in the Miocene rocks of Australia may 

 at first seem to upset the usefulness of any attempt to fix the zonal distribution 

 of species. I possess a slide containing examples of all the Vincularin species 

 described by Mr. A. W. Waters in his first paper on the Australian Bryozoa,* 

 (from Yarra-Varra, Victoria), but I am not able to deal with these forms in this 

 abstract ; their presence in Australian rocks may be easily accounted for when we 

 remember that both in Australia and New Zealand, according to Prestwich," 

 there is a considerable development of Cretaceous or Cretaceo-Tertiary strata. 



' Die Bryozoen der Aavhner Kreidebildung, p. 80, Tab. IX. figs. 116-119, 1805. 



' Proc. Yorlish. Geol. Soc. vol. ix. p. 6, pi. I. fig. 5, and Ibid. vol. xi. pp. 250-275. 



• Die Bryoz. der Weissen. Schrcibkreide der Insel Riigen, p. 24, &c. 1887. 



• Brit. Assoc. Reports, 1890-91, p. 389. 

 ' L.c. Nachtraq, p. 04.5. 



• Op. cit. p. 17, Tab. I. fig. 4. 



' Reuss in Geinitz, Elbthalgebirge, ii. 1874, p. 130, Tab. XXIV. figs. 17, 18. 

 ' Quart. Journ. Geol. Sue. vol. xxxvii. p. 309-347, PI. XIV. 



• Geology, vol. ii. p. 308. 



