236 DEVONIAN FAUNA. 



4. Genus CCELIOCEINUS, White, 1863. 



1. COELIOCRINUS, n. sp. Plate XXXVIII, fig. 7. 



Description. Dorsal cup unseen. Arms stout, slowly diminishing in size, 

 bifurcating at nearly level distances, the ramifications occurring only on the two 

 outer arms of the rays, and the branches being given off toward the inner side of 

 the ray, and remaining single throughout. Arm-plates extremely short, uniserial, 

 cuneate. Pinnules large and long. About five plates between the first divari- 

 cation seen and the second ; about seven between the second and third ; and about 

 eleven between the third and fourth. Anal sac long. 



Size. A specimen with parts of the arms is 22mm. long. 



Localities. A single defective specimen from Barnstaple is in the Woodwardian 

 Museum. 



Remarks. This specimen being a mass of arms with only indistinct indications 

 of the dorsal cup is insufficient for full determination, but at the same time is 

 distinctly different from any other Pilton Crinoid. 



As far as can be seen, it has great resemblance to such forms as Zeacrinus cari- 

 niferus, Worthen, 1 and Z. lyra, Meek and Worthen, 2 which Wachsmuth and Springer 

 refer to Coeliocrinus* a genus with a " balloon-shaped " dorsal sac, and for one of 

 the species of which they somewhat rapaciously claim 4 the well-known Ecliino- 

 sphderites tesselatus, Phillips, sp., 5 regardless of its structure ! A small portion of the 

 ventral sac, seen in our specimen, proves it to have been large and possibly wide, 

 but its shape is unknown, so that it is not certain whether our species belongs to 

 this or some kindred genus. The cuneate plates of the arms, however, appear, 

 according to "Wachsmuth and Springer, to separate it from Zeacrinus, and from 

 such species as Zeacrinus ramosus, Hall, 6 or Scaphiocrinus subaequalis, Wachsmuth 

 and Springer, 7 which, after having placed in a new genus Pachylocrinus, they 

 afterwards referred to Woodocrinus, de Koninck, 8 from the type form of which, 

 W. macrodactylus, these species certainly have a very different aspect, though 

 they may be more like W. expansus, de Koninck. 9 



1 1873, Meek and Worthen, ' Geol. Surv. Illin.,' vol. v, p. 535, pi. xx, fig. 4. 



2 Ibid., p. 432, pi. i, fig. 11. 



8 1879, "Wachsmuth and Springer, ' Proc. Acad. Nat. Sci. Philad.,' 1879, p. 354. 



4 1886, ibid., p. 168. 



5 1841, Phillips, ' Pal. FOBS.,' p. 135, pi. lix, figs. 49 XX a, b. 



6 1858, Hall, 'Report Geol. Surv. Iowa,' vol. i, pt. 2, p. 548, pi. ix, fig. 3. 



7 1873, Meek and "Worthen, ' Geol. Surv. Illin.,' vol. v, p. 494, pi. xv, fig. 6 (this figure, however, 

 has cuneate plates) ; and 1879, "Wachsmuth and Springer, ' Proc. Acad. Nat. Sci. Philad.,' 1879, p. 339. 



8 1854, de Koninck et le Hon, ' Recherches Crinoid. Terr. Garb. Belg.,' p. 212, pi. viii, figs. 1 ae. 



9 1858, de Koninck, ' The Geologist,' vol. i, p. 13, pi. ii, fig. 1. 



