8. H. Reynolds — Lower Palceozoic fossils of Yorkshire. 109 



"Note. — I have to acknowledge my great indebtedness to Mr. Mart 

 for much help in the examination of these obscure fossils. 



These fossils are all small, and are generally very poorly preserved. 

 Encrinurus punctatus, var. arenaceus, fig. 2, is represented by a well 

 preserved glabella with the fixed cheeks attached. Several heads, 

 fig. 3, of Staurocephalus, cf. Murchisoni, and one tail, fig. 4, were 

 found. Cyphaspis, cf. rastrtium, fig. 6, has at the anterior end of the 

 head a triangular area which extends back and nearly meets the 

 glabella. Cyphaspis, sp., cf. Burmeisteri, fig. 7, has a very short 

 glabella, less than half as long as the head. Marpes Judex is 

 represented by a fragment of the limb. 



The following species may be added to the list recorded by 

 Mr. Marr, frorti the Bala beds of Norber Brow : — 



Agnostus trinodus, Salt. 



Ampyx ? rostratus, Sars. 



Staurocephalus {Sphmrocoryphe) unicus, Thom. 



Dindijmene Hughesiae, Roberts M.S. 



? Ateleoci/stites. 



The '^ Ateleocystites, figs. 9 and 10, comes from the Bala beds of 

 Wharfe, the other species are all from those of Norber. 



Staurocephalus unicus, fig. 8, is not at all well preserved, but the two 

 prominent spines on the margin are sufficient to distinguish it. An 

 imperfect tail was also found. A specimen of Dindymene is recorded 

 by Mr. Marr, and he refers it provisionally to D. ornata, Linuars. 

 Mr. Eoberts had commenced a description of it, and found it to 

 differ from any species previously described. He proposed to call 

 it D. Hughesiae after its discoverer, Mrs. T. McKenny Hughes. 



Description of Dindymene Hughesiae. 

 (PLATE IV. Figs. 1 and 5.) 



Length and breadth each somewhat less than an inch. Head 

 occupj'ing about one-third of the total length, semicircular in shape, 

 without cheek-spines. Glabella and cheeks considerably inflated. 

 Glabella much wider in front than behind, separated from cheeks by 

 very deep grooves. Glabella bears two, and each of the cheeks 

 bears one large tubercle. A narrow border extends right round the 

 cheeks, and the whole surface of the glabella and cheeks is minutely 

 granulated. No eyes or facial suture. Thorax with ten segments, 

 each segment of axis marked by a pair of small laterally placed 

 tubercles. Pleuree greatly prolonged into spines, those of the 3rd, 

 4th and 5th being longest. Spines of anterior pleurae form a nearly 

 straight line with proximal parts of pleurae, spines of the next 

 pleurae are somewhat curved, and those of the last few pleuras are 

 bent back nearly parallel to the pygidium. Axis of pygidium less 

 than half as long as thorax, marked by slight furrows, which do not 

 extend completely across it. Pygidium has 3 pairs of pleura3, all of 

 which are bent back nearly parallel to the axis, while the last pair 

 are nearl}' in contact with the axis. 



D. Jliighesiae resembles D. ornata, Linnars., but has the following 

 distinguishing; characters : — 



