470 DR F. A. BATHER. 



Caradoc series is still unknown to me ; and I am even less well informed as to the other 

 localities. The MS. label, probably by Grindrod, attached to the Oxford specimen 

 bears the letters " B, 7. g.," and a later hand has added " Upper Bala." The Museum 

 of Practical Geology Catalogue of Cambrian Fossils (1878, p. 63) quoted the species 

 also from the Lower Llandovery at Blaen-y-Cwm, on I know not what evidence. The 

 Sedgwick Museum specimen is from the lower part of the Coniston Limestone series. 



Salter (1866, p. 288) also says that " fragments of this genus occur in the Bala 

 Limestone itself," and (on p. 262) quotes Pleurocystites sp. from Rhiwlas. These state- 

 ments probably do not refer to P. Ruge7'i (§ 454), and, in any case, Dr F. L. Kitchin 

 informs me that no species from that locality, or from the Bala Limestone at all, are 

 preserved in the Museum of Practical Geology. 



The name Pleurocystis Rugeri occasionally appears in lists of fossils accompanying 

 papers on stratigraphy, but there is no guarantee that the determinations are correct. 



§ 448. Type-material. — The only specimen described and figured by Salter (1866) 

 is the one from Blaen-y-Cwm, preserved in the Museum of Practical Geology and 

 already recorded as the type-specimen (holotype) by H. A. Allen (1902). Mr Allen, 

 it should be noted, gives only the number 7434, whereas the specimen really consists 

 of two counterparts : the one (7434, our PI. V. fig. 58) preserving an impression of the 

 anal side of the specimen, as figured by Salter, not "the internal cast"; the other 

 (25701, our PI. V. fig. 57) preserving the impression of the antanal side. Counterpart 

 7434 is a thick, irregularly broken mass of rock, split roughly along a bedding plane, 

 with an area of about 7 cm. x 6"5 cm., on which lie portions of at least four individuals 

 of this species. All the individuals appear to have been lying in the same general 

 direction and on the same side, so that in this counterpart it is the imprint of the anal 

 side that is seen in each case. Only two of the individuals are shown at all clearly. 

 Counterpart 25701 is a small fragment preserving the imprint of the greater part of 

 the antanal side of the principal specimen and small portions of that of the others. 



§ 449. Other Material. — Specimen 964, preserved in the same way as 25701 ; 

 25828, 25829, the imprint and internal cast of a stem ; 25831, the interior of a portion 

 of the antanal test, covered in small part by periproctals ; 25832, probably plate 7 or 2 

 of this species ; 25702, the imprint, and 25703, the imperfect theca : all in the Museum 

 of Practical Geology (§ 446). 



A specimen in the Grindrod collection at the Oxford University Museum (PL V. 

 fig. 59) bearing on its back the number J20|, consists of a theca and the proximal portion 

 of its stem, for the most part preserved as an internal cast ; the antanal face is upper- 

 most, but most of the plates over the middle region have disappeared entirely. 



A specimen found by the Rev. A. Pagan, referred to by Mr J. E. Marr (1887, 

 p. 36, and 1892, p. 108) as " Ateleoci/stites sp.," and described by Mr S. H. Reynolds 

 (1894, p. 1 10, pi. 4, ff". 9, 10) as "? Ateleocystites," is in the Sedgwick Museum, Cambridge, 

 and through the kindness of Prof. M'Kenny Hughes and Mr H. Woods, has long been 

 in my hands for study. It is in a calcareous mudstone, said to be from the Coniston 



