210 DEVONIAN FAUNA. 



extending into the deep axial canal, which is not separated from the groove by 

 a calcareous wall. Inner sides of ambulacral groove marked by coarse transverse 

 rounded stria?, alternating with marginal sulci. Base of the first brachial widened 

 horizontally, and obliquely bevelled or truncated downwards from its ventral sur- 

 face, forming two smooth margined triangles, marked only by two small short 

 ridges near the base of the central groove; and having a strongly-marked fulcral 

 ridge with a linear depression on either side of the axial canal and ventrad of the 

 ridge. 



Size of calyx. — Height 16 mm., width 30 mm. A portion of the arm 18 mm. 

 high, and without apparent articulation, measures 12 mm. wide. 



Localities. — From Wolborough there is a fine calyx in Mr. Champernowne's 

 Collection, another in the Torquay Museum, and another in the British Museum. 

 In my Collection is a specimen of the lower part of one of the peculiar arms from 

 Lummaton. 



Remarks. — As the consolidating apparatus is unseen in our specimens of 

 Cupressocrinus, it is rather difficult to decide their species. It will be seen that 

 while one of our figured calyces exactly corresponds with figures of G. crassus, 

 the other is equally like C. nodosus, Sandberger, which is generally regarded as a 

 synonym of G. abbreviates, Goldfuss. Schultze remarks that rolled specimens of 

 the latter are very like the former. In the opinion of my friend Mr. Bather, both 

 species occur in England, and of the present form he notes that " the greater 

 korizontality of the basals, the greater proportional width of the radials, and the 

 traces of concentric ridging on the cup plates separate it from G. crassus and 

 G. elongatus, Goldfuss. 1 " 



The curious specimen of the arm may be compared with a similar figure of that 

 of G. a.bbreciatus, var. minor, given by Schultze. It would appear to consist of 

 several segments so cemented together as to obliterate their divisions, rather than 

 of a single elongated segment. 



2. S(JB-oiu>ur. — Fistulata, Wachsmuth and Springer, 1886. 



I. Family. — Cyathocrinid2e, F. Burner, 1855. 



1. lie nas. — SriLKKOOKlNUS, F. Homer, 1851. 



The validity of this genus is doubtful. It seems distinguishable from 

 Cyathocrinus by the number of its anal plates, and from Poteriocrinus by the horse- 

 shoe-like facets for the brachials. Though, according to Mr. Bather, it may 

 prove synonymous with Parisocriiivs, it seems simplest for the present to retain 

 it as distinct, pending the discovery of its arms. 



1 I 838, Goldfuss, ' Nova Acta Akad. Leop.,' vol. xix, pt. 1, p, 331, pi. xxx, fig. 2. 



