the "'Cirripede^^ Pluiiiulites. 



125 



Plumulites esthonicus, sp. n. 



Diagnosis. A. Plumulites with small plates, the admedian 

 plates under 4 mm. in height, and the outer plates about 

 6 mm. J the growth-lines very closely disposed, 6 to 7 to a 

 millimetre in the outer plates, the admedian plates have the 

 proximal margin deeply excavated in the middle, and the 

 plate is divided into two lobes by a wide and obscure api co- 

 proximal fold, the inner lobe being extremely protuberant 

 from the apex ; outer plates with the outer proximal angle 

 broadly rounded, and with the median fold nearer to the 

 outer marein. 



Plumulites esthonicus, sp. u. 



Figs. 1 & 2. — Outer or " kite-shaped " plates, x 6 diam. 

 Figs. 3 & 4. — Admedian or "heart-shaped" plates, x 6 diam. 



(Figures drawn by Miss G. M. Woodward.) 



Horizon and locality. Middle Ordovician, Kuckers Stage 

 (C^ of Schmidt) : Jaerve, nr. Kuckers, 10 km. N.W. of 

 Jewe Station, Esthonia. 



Collection. The holotype and one of the figured paratypes 

 (fig. 3) remain in the collection of Mr. H. Bekker, but they 

 will ultimately be presented with other specimens to the 

 Geological Museum of the University of Tartu (Dorpat) ; 

 the two remaining figured paratypes (figs. 2, 4) aud two 



