214 DEVONIAN FAUNA. 



Description. — Calyx small, bean-shaped, longitudinally flattened on four sides, 

 so arranged as to form alternate triangles. At about one fourth the length from 

 each end occur deep fissures, so that on one side at least it terminates in three or 

 more sharp triangular limbs. Structure of test very massive. 



Size. — Length (incomplete at basal end), 5'6 mm. Greatest width (which is 

 about half-way down the preserved portion), 3*9 mm. Length of radial sinus, 

 circa 1*75 mm. 



Locality. — Barton. The unique, and, unfortunately, very indistinct specimen 

 is in the Lee Collection in the British Museum [E 1044]. 



Remarks. — Of this specimen Messrs. Etheridge and Carpenter write, " It is too 

 ill preserved for description, but has much the aspect of a Troostocrinus or 

 Metablastus." Considering the extremely worn state of the specimen, together 

 with the general shape of what is left of it, it appeared to me that it might 

 possibly be the remains of a species of the kindred Tricoelocrinus, whose general 

 shape and lower extensions might better accord with our fragment. This can, 

 however, be regarded merely as a surmise. 



Affinities. — It differs from the type species, T. Woodmani, Meek and Worthen, 1 

 by being less petaloid, by having shorter limbs, and by having the lower excavations 

 extending further on as flattened spaces. 



1 1873, Meek and Worthen, ' Geol. Surv. Illinois,' vol. v, p. 506, pi. xvi, fig. 4; and 1886, 

 Etheridge and Carpenter, 'Brit. Mus. Catal. Blastoid.,' pi. xix, figs. 13 — 16. 



ERRATA. 



P. 192, Hue 1, delete "and PI. XXV, fig. 1, la." 

 P. 199, line 15, delete " and PI. XXV, fig. 2, 2c." 



