232 DEVONIAN FAUNA. 



Remarks. All these specimens are imperfect and indistinct. They seem to 

 agree as far as can be made out, but whether they belong to a new form or to one 

 of the accompanying species is uncertain. 



5. SCAPHIOCRINUS ? SALEBROSUS, n. sp. Plate XXXVII, fig. 13. 



Description. Stem pentagonal, composed near the cup of short alternate 

 columnars with a raised central band round their peripheries. Dorsal cup rather 

 shallow, bowl-shaped (nearly hemispherical), composed of tumid plates. Infra- 

 basals very indistinctly seen. Basals large, convex, apparently hexagonal. 

 Radials convex, pentagonal, truncated above, and with a linear articulating ridge. 

 Azygous plate pentagonal, situated on the shoulders of two basals, and bearing 

 an anal piece on its left shoulder, and another on its truncated summit. First 

 primibrach in some of the arms axillary? Arms stout, uniserial, bifurcating (in 

 one instance six plates up), composed of somewhat cuneate plates ; (arm-furrows 

 wide, with ligamental fossae?). Pinnules strong, with rather short plates. Ventral 

 sac probably large, and covered by ridged, polygonal plates. Surface of body and 

 arm-plates covered with a minute irregularly corrugated ornament. 



Size. A dorsal cup measures about 6 mm. high and 9 mm. wide. 



Localities. A specimen from Pilton is in the Porter Collection ; another from 

 Barnstaple in the Woodwardian Museum ; a third from Upcott in the Barnstaple 

 Athenaeum. 



Remarks. Of these specimens the first is exposed longitudinally, the second 

 horizontally, while the third is only a most obscure and doubtful basal part of a 

 cup. They seem sufficient to show the distinctness of the species, but not to give 

 a clear conception of its characters. The bowl-shaped cup with tumid plates 

 covered with a minute ornament gives distinguishing characters. The ventral 

 sac is not itself seen, but the occurrence of numerous peculiar plates indicates 

 something of its size and character. It seems to differ from Poteriocrinus 

 Barumensis by having larger basals and smaller infra-basals and by the greater 

 tumidity of its plates. 



It appears to come very near to the characters given by Wachsmuth and 

 Springer 1 for Gromyocrinus, a genus which they first unite with and then separate 

 from Eupachycrinus, Meek and Worthen. 2 It may be compared with C. globosus, 

 Worthen, sp., 3 and 0. papillatus, Worthen, sp. 4 



1 1879, Wachsnauth and Springer, 'Proc. Nat. Sci. Philad,,' 1879, p. 356. 



2 1886, ibid., 1886, p. 170. 



3 1873, Meek and Worthen, ' Geol. Surv. Illin.,' vol. v, p. 557, pi. xxi, fig. 12. 



4 1883, Worthen, ibid., vol. vii, p. 315, pi. xxix, fig. 17. 



