BY R. KTHEKIDGK, .TUXK., AND JOHN MITrFTELL. 649 



i^'cuera, and in this instance is followed by his French translator, 

 Dr. C. Barrois;"^ but in Eastman's English translation, Prof. C. 

 E. Beecher, who edited the Trilobita, made Cronivs a synonym 

 of Enc7'inu7'us.j 



In the face of Barrande's detailed description and finely ex- 

 ecuted figures, we fail to see how it is possible to unite the genera 

 under discussion. Failure to thoroughly grasp the importance 

 of some of the structural details disclosed above, has caused us, 

 in the past, to make erroneous determinations, but now that we 

 have an opportunity of studying the Australian Encrinui-ids as a 

 whole, we hope to rectify these. 



The following are the more important characters of Eucri- 

 niLviis : — 



A pyriform, forwardly inflated glabella, devoid of lateral 

 furrows, highly clothed with tubercles of which five pairs border 

 the axial grooves, and the three pairs of these placed between 

 the anterior and posterior pairs are larger than the others; facial 

 sutures either openly V-shaped or bi-sigmoidal, meeting ante- 

 riorly in the middle line of the glabella and cutting the anterior 

 cephalic margin as a single suture; eyes pedunculate and faceted; 

 axial grooves curve outwards to the antero-lateral margins of the 

 cephalon, crossed by the facial sutures, and distinctly divide the 

 free cheeks into two unequal portions; hypostome subrhomboidal, 

 anteriorly cucullate; thorax of eleven somites; pygidium trian- 

 gular, its axial rings anchylosed, and the pleura? composed of 

 from seven I to thirteen or more simple, rounded, and unfurrowed 

 segments. 



iii. AUSTRALIAN HISTORY OF THE ENORINURID^. 

 I.New South Wales. 



The first writer to detect the presence of this family in Aus- 

 tralian Silurian rocks was Mr. J. W. Salter, for amongst his 



* Barrois, Traite de Pala^ontologie, ii., pp.617- 18. 

 tZitlel's Textbook Pal., 1900, i., p 634. 

 X E. ornatus, Hall & Whitfield, of the Niagara Group of Ohio, possesses 

 but seven (Geol. Survey Ohio, Pal. ii., Pt. ii., p. 154, PI. vi., fig. 16); pro- 

 bably au abnormal form. 



