PLATE XXIII. 

 Dicellograptus — continued, 



TIGS. 



1 a — f. — Dicellograptus moffatensis, Carruthers. (Page 157.) 



1 a. ? Type specimen. Figured, Carruthers, Trans. Roy. Pliys. Soc. 



Edinb., p. 469, fig. 3. Hartfell Spa. Hartfell Shales. Museum 



of Natural History, S. Kensington. 

 1 b. Typical form. Glenkiln Burn. Hartfell Shales (zone of Dicranog. 



Glingani). Lapworth's Collection. 

 1 c. Specimen with continuously divergent stipes. On same slab as 



fig. ] b. 

 1 d. Widely divergent form, doubtfully referable to this species. 



Craigmichan Scaurs, Selcoth Burn. Hartfell Shales. Lapworth's 



Collection. 

 1 e. Specimen figured, Hopkinson, Geol. Mag., 1871, vol. viii, pi. 1, 



figs. 4 a, b. Hartfell Spa. Bart Ml Shales. Sedgwick Museum. 



1 /. Poorly preserved specimen. Figured, Hopkinson and Lapworth, 



Quart. Journ. Geol. Soc, 1875, vol. xxxi, pi. xxxv, fig. 5 a, 



2 a — p.- — Dicellograptus elegans, Carruthers. (Page 150.) 



2 a. Type specimen. Figured, Carruthers, Geol. Mag., 1868, vol. v, 



pi. v, fig. 8 d. Dobb's Linn. Hartfell Shales. Museum of 



Natural History, S. Kensington. 

 2 h. Small specimen. Figured, Hopkinson, Geol. Mag., 1871, vol. viii, 



pi. i, figs. 3 a, h. Dobb's Linn. Hartfell Shales. Sedgwick 



Museum. 

 2 c. Ibid., figs, 3 c, d. 

 2 il. Typical form. Dobb's Linn. Hartfell Shales (zone of Pleurog. 



linearis). Lapworth's Collection. 

 2 e. Typical form, showing prominent " lateral " spines. Hartfell Spa, 



Hartfell Shales. Lapworth's Collection. 



8. — Dicellograptus elegans, var. rigens, Lapworth, MS. (Page 161.) 



3. Typical rigid form. Mount Benger Burn, Selkirkshire. Hartfell 

 Shales. Lapworth's Collection. 



4 a — c. — Dicellograptus caduceus, Lapworth. (Page 161.) 



4 a. Typical form. Dobb's Linn. Hartfell Shales. Lapworth's 



Collection. 

 4 b. Large specimen. Hartfell Spa. Hartfell Shales. Lapworth's 



Collection. 

 4 c. Specimen with stipes crossing only once. Ibid, 



