19S DEVONIAN FAUNA. 



counting his fossil as congeneric with H. interscapular is. I have not been able to 

 find his figured specimen unless this one be the remains of it. 



Miller's species does not seem founded on a true crinoid, but in part, if not 

 altogether, on a Pentremite, one of his figures looking as if erroneously restored. 



7. Hexacbinus qitjntangulus, Whidhorne. Plate XXIII, figs. 6, 6 a, 7. 



1843. Hexacrinus ? pentangularis, Austin. Mon. Bee. and Foss. Criuoidea, 



p. 51, pi. vii, figs. 1 a — c, i. 

 1S89. Platycrinus quintangulus, Whidborne. Geol. Mag., dec. 3, vol. vi, p. 79. 



Description. — Dorsal cup rather large, short, widely conical, becoming penta- 

 gonal in section at the top. Proximal columnal very narrow, circular, with a flat 

 and smooth margin, having a narrow central, raised, finely crenulated band. 

 Attachment of column large. Basal circlet large, deep, between one third and 

 one half the height of the cup, margined above by an irregular hexagon with unequal 

 concave sides, and slightly constricted below so as to form a narrow raised rim 

 round the attachment. Basal plates three, apparently nearly equal, one plate 

 (if not all) being hexagonal. Radials five, yerj large, rather longer than wide, 

 with convex inferior margins, nearly straight sides, and wide shallow notches 

 on the upper margins ; each plate becoming centrally swollen and bluntly sub- 

 angular in the upper part of its surface, so as to give a stellate appearance to the 

 top of the cup. First primibrachs very small, narrow, not half filling the notches 

 in the radials. Second primibrachs axillary, narrow, triangular, small, only partly 

 filling the remainder of the notch. First secundibrachs rather large, sublunate, 

 rayed on their upper articular surface. Arms nearly erect. Anal plate inter- 

 calated with the radials and of similar size, bluntly triangular in the lower margin, 

 rather convex on the shoulders, with other plates above it, protruding in a short 

 semicircular tube Surface unknown. 



Size of calyx. — Height about 33 mm., width about 33 mm. 



Localities. — From Wolborough two specimens are in the Museum of Practical 

 Geology, and two in Mr. Vicary's Collection. From Lummaton a very indistinct 

 calyx in my Collection seems to belong to this species. 



Remarks. — These specimens are all too defective to give a very clear idea of 

 the species. One of the two in the Museum of Practical Geology was figured by 

 Austin as " Hexacrinus ? pentangularis (Phillips)," but it certainly does not belong 

 td Miller's or Phillips's fossils, which in no way agree with the present species. 

 Therefore, though Austin has changed the genus, it hardly seems wise to retain 

 a specific name that has descended to it from another species, and therefore a 

 fresh name has been suffofested. 



