108 F. A. BATHER, CEIN01DEA OF GOTLAND. 



Euspirocrinus. 



1878, Euspirocrinus, Angelin, Iconographia, p. 24. 



Angelin's diagnosis, as translated into English and modern terminology, is as follows: 

 Crown subpyriform. Dorsal cup rather short, cup-like, unsymmetrical. IRB 5, sub- 

 equal. BB 5, 4 rather pointed, 5th with its apex subovately truncate by the anal. RR 5, 

 rather large, sublunate. Anals 2: x rather long, heptagonal, with truncate apex; the 

 upper smaller, hexagonal, truncate. A single interradial (R') on the right of the anal 

 radius, touching two BB, x and r. post. R. 5 series of ambulacra, branched at their 

 distal ends, on the tegmen. Anal tube narrow; with few rather large ossicles. Arms di- 

 chotomous, involute distally. Stem short, with distinct axial canal, ossicles alternately 

 larger and smaller. 



Fresh material of E. spiralis Ironi Gotland, and the deseription of E. obconicus 

 \Y. R. Billings *) enable and oblige me to present the following 



Revised Greneric Diagnosis. 



IBB 5. BB 5; post. B and r. post. B heptagonal; the rest hexagonal. RR 5. Anals 

 as in Family diagnosis. Arms rather widebacked, with a tendency to distal involution. 

 Anal tube cylindrical. Tegmen with 4 massive deltoids supporting the ambulacra; the 

 madreporite partly covered by the lower plates of the anal tube. Stem with 5 radial 

 su t ures. 



Euspirocrinus spiralis. 



(Plate V, figs. 148 — 157). 

 isys. Angelin, Iconographia, p. 21, Tab. IV, fig8. 7 and 7 a — e. 



Revised specific Diagnosis. 



Primibrachs usually 2, rarely 1 or 3. Lower plates of anal tube of about the same 

 size as the anals of the cup; tube narrow. Stem short. 



The speciniens known to Angelin, which may therefore be taken as the type-spe- 

 cimens, are four. Of these, three were fignred by Angelin; and two of them ha ve lately 

 been figured by Messrs. Wachsmuth and Springee. 2 ) In going through the collection in 

 the Riksmuseum I have bcen fortunate enough to unearth 5 more specimens of this genus, 

 which, though tliey present some dififerences, may all be referred to the present species. 

 The nine specimens are as follows. 



') Traus. Ottawa Field-Nat. Club., vol. II, No. "2, )>. '248: 188Ö. Througli the Kindness dl' Mr. Billings and 

 tln' Officers of the Canadiaii Geol. Survey, I have been al>lt- tu exaraine the type and other specimens of this s|irrir>. 



' J ) The perisoraic plates of the Crinoids. Proc. Acad. Nat. Sci. Philadelphia, (18!>o) Part. 111. IM. IX. 

 fitfs. 4 and 5. Feb. 1891. 



