from the Kuckers Stage in Esthonia. 329 



The whole thickness of the Kuckers stage, which may 

 vary from 30 to 50 feet, is not seen in the beds of the quarry 

 described above. 



Below the terrace bituminous shale is found under peat 

 for a distance of 1 km. northwards. The shale was to be 

 used in the summer 1917 for fuel in some factories in 

 Esthonia and Petrograd. In Kukrase and Tiirpsalu it was 

 worked from quarries and adits under the terrace-like ascent. 



The marly bed and the limestone of the Kuckers stage 

 contain very fine crystals of marcasite, galena, groups of 

 calcite crystals, and copper glance. 



The fauna of the Kuckers stage is very abundant: though 

 closely related to the Eehinospliserite limestone (C^, the 

 development of species and individuals is greater. In great 

 abundance are brachiopods, gasteropods, crinoids, cystideans, 

 orthoceratites, ostracods, and fragmentary remains of trilobites. 

 The characteristic fossil Pkacops (Chasmops) ordini can often 

 be found in excellent preservation, as can also other fossils. 

 The various bryozoa exist in great abundance. Very often 

 the shale-beds are crowded with bifoliate and other fine 

 bryozoa, whose white calcareous skeletons compose 30 to 40 

 per cent, of the shale in some parts. 



New Bryozoa of the Kuckees Stage. 



Pachydictya, Ulrich. 



E. 0. Ulrich, 1882, Joum. Cincinnati Soc. Nat. Hist. vol. v. p. 152. 

 E. O. Ulrich, 189U, " Paleozoic Bryozoa," Geol. Suit. Illinois, vol. viii. 



part 2. 

 E. S. Bassler, 1911, "Early Paleoz. Bryozoa of the Baltic Provinces," 



Bull. U.S. National Mus. lxxvii. p. 137. 



Puchydictya kxckerseusis, sp. n. (PI. VII. figs. 1—6.) 



Di gnosis. Zoarium bifoliate, frequently brandling. The 

 zooeeial apertures circular, arranged in transverse, often 

 sinuous rows. 



Locality and Horizon. Kukruse (Kuckers) and Tiirpsalu, 

 Esthonia. Middle Ordovician, stage C 2 of Prof. F. Schmidt. 



Material. Holotype in my collection in the Geological 

 Museum of the University of Tartu (Dorpat). Paratypes, two 

 specimens of my collection in the British Museum, Geological 

 Dept., Regd. D. 2983b'-7. 



Description. Zoarium dichotomously branching ; the 

 branches may be situated close to (1 mm.) or at any distance 

 (21 mm. or more) from each other (tigs. 1, 2, 3). The 



