468 Dr. H. Woodward — Carboniferous Arthropods. 



2. Note on Euproops (Pkestwichia) Bibtwelli, H. "Woodw. 



Prestwichia Birtwelli, H. Woodward, Geol. Mag., Vol. IX, p. 440, PL X, 



Figs. 9, 10, 1872. 

 P. Birtwelli, H. Woodward, Pal. Soc. Mon., Merostomata, pt. v, pi. xxxi, 



figs. 7a, i, c, p. 247, 1878. 



After careful reconsideration of this species I liave come to the 

 conclusion that the nodules in wliich these two specimens were 

 enclosed contained only the central portion of the body-shields, and 

 that the flat marginal scalloped borders, with their spines, and telson 

 were not preserved as they extended beyond the hard central con- 

 cretion into the softer external concentric layers of clay (as frequently 

 observed by Dr. Moysey and myself in the clay-ironstone nodules at 

 Shipley, near Ilkeston, Derby, and tliosealsoof Rochdale, Lancashire, 

 and Coalbrookdale, Shropshire), and so were not preserved. 



The general form of the raised rounded central portion of the body- 

 shield resembles more that of Euproops than it does PrestwichianeUa. 

 Assuming the margin to have been furnished with a scolloped border 

 and the segments to have terminated in marginal spines upon the 

 border of the thoracetron, the resemblance to Euproops Dance, 

 E. anthrax, and E. Amice, would have been complete. 



Formation and Locality. — Coal-measures : Cornfield Pit, south bank 

 of the liiver Calder, Padihara, Lancashire. 



3. Note on the genus Peestwichia, H. Woodw., 1866. 



In reference to the genus Prestwichia I had for some time been 

 doubtful as to the advisability of retaining the species named 

 P. anthrax and P. rotundata under the same genus. The investigation 

 of this matter led to the discovery [to which my attention was 

 obligingly drawn by my friend Mr. Charles Davies Sherborn, of the 

 Britisli Museum (Natural History)] of a note which had appeared in 

 the Americaft Geologist for 1905, p. 330, by Mr. T. D. A. Cockerell, of 

 the University of Colorado, U.S., that the name Prestwichia had been 

 preoccupied for a genus of Hymknopteea. by Lubbock in 1863, and 

 suggesting the propriety of transferring the species so named to 

 Messrs. Meek & Worthen's genus Euproops, 1868. The specimen 

 here referred to was first described in 1865 bj^ Meek & Worth en 

 under the name of Belinurus Dance ; later on Mr. Meek assigned his 

 specimen to a new genus between Belinurus and Prestivichia, for 

 which he proposed the name Euproops, in allusion to the anterior 

 position of its eyes.^ 



But'although this form, like Prestwichia, has the segments of the 

 thoracetron anchylosed, Euproops differs from it in the quadrangular 

 form of the glabella, and the eyes being situated forward on its 

 anterior lateral angles, vt^hile in Prestwichia they are borne upon 

 the lateral margins; the gen al border must therefore be considered 

 equivalent to the orbital suture, or (most probably) coalesced with it.'' 



^ P. B. Meek, Amer. Journ. Sci. & Arts, May, 1867. See also Geol. Mag., 

 July, 1867, p. 320, and Geol. Eept. by Meek & Worthen, Survey of Illinois 

 (Palaeontology), vol. iii, 1868. 



^ In many of the Trilobita the eye-suture and the axial line of the glabella 

 are close together ; in young stages of the living American Limulus the axial 



